�??xml version="1.0" encoding="utf-8" standalone="yes"?><rss version="2.0" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:trackback="http://madskills.com/public/xml/rss/module/trackback/" xmlns:wfw="http://wellformedweb.org/CommentAPI/" xmlns:slash="http://purl.org/rss/1.0/modules/slash/"><channel><title>&#20013;&#25991;&#23383;&#24149;&#20122;&#27954;&#32508;&#21512;&#20037;&#20037;&#33760;&#33821;&#34588;&#44;&#31934;&#21697;&#20037;&#20037;&#32508;&#21512;&#49;&#21306;&#50;&#21306;&#51;&#21306;&#28608;&#24773;&#44;&#22269;&#20135;&#54;&#57;&#31934;&#21697;&#20037;&#20037;&#20037;&#20037;&#57;&#57;&#57;&#57;&#65;&#80;&#71;&#70;&#13;</title><link>http://www.shnenglu.com/huxiaofeng/</link><description /><language>zh-cn</language><lastBuildDate>Fri, 09 May 2025 03:48:53 GMT</lastBuildDate><pubDate>Fri, 09 May 2025 03:48:53 GMT</pubDate><ttl>60</ttl><item><title>CDC�c�d��象的行�ؓ(f��)函数</title><link>http://www.shnenglu.com/huxiaofeng/archive/2010/03/29/110922.html</link><dc:creator>�?/dc:creator><author>�?/author><pubDate>Mon, 29 Mar 2010 14:15:00 GMT</pubDate><guid>http://www.shnenglu.com/huxiaofeng/archive/2010/03/29/110922.html</guid><wfw:comment>http://www.shnenglu.com/huxiaofeng/comments/110922.html</wfw:comment><comments>http://www.shnenglu.com/huxiaofeng/archive/2010/03/29/110922.html#Feedback</comments><slash:comments>1</slash:comments><wfw:commentRss>http://www.shnenglu.com/huxiaofeng/comments/commentRss/110922.html</wfw:commentRss><trackback:ping>http://www.shnenglu.com/huxiaofeng/services/trackbacks/110922.html</trackback:ping><description><![CDATA[(1)、常用的�l�画成员函数�Q?br>&nbsp;&nbsp;&nbsp;&nbsp; SetPixel()�Q�用指定的颜色在指定的坐标画一个点�Q�返回��gؓ(f��)RGB颜色��|��<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 函数原型 <strong>COLORREF</strong> <strong>SetPixel(</strong> <strong>int</strong> <em>x</em><strong>,</strong> <strong>int</strong> <em>y</em><strong>,</strong> <strong>COLORREF</strong> <em>crColor</em> <strong>); <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; COLORREF</strong> <strong>SetPixel(</strong> <strong>POINT</strong> <em>point</em><strong>,</strong> <strong>COLORREF</strong> <em>crColor</em> <strong>);<br></strong>&nbsp;&nbsp;&nbsp;&nbsp; MoveTo()�Q�移动当前位�|�到指定的坐标，�q�回��gؓ(f��)以前位置的坐标；<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 函数原型&nbsp; <strong>CPoint</strong> <strong>MoveTo(</strong> <strong>int</strong> <em>x</em><strong>,</strong> <strong>int</strong> <em>y</em> <strong>);<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;</strong><strong>CPoint</strong> <strong>MoveTo(</strong> <strong>POINT</strong> <em>point</em> <strong>);<br></strong>&nbsp;&nbsp;&nbsp;&nbsp; LineTo()�Q�从当前位置到指定位�|�画一条直�U�，成功�q�回�?�Q?br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;函数原型&nbsp; <strong>BOOL</strong> <strong>LineTo(</strong> <strong>int</strong> <em>x</em><strong>,</strong> <strong>int</strong> <em>y</em> <strong>);&nbsp;<br></strong><strong>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;BOOL</strong> <strong>LineTo(</strong> <strong>POINT</strong> <em>point</em> <strong>);<br></strong>&nbsp;&nbsp;&nbsp;&nbsp; Polyline()�Q�从当前位置�Q�绘��d��条曲�U�，成功�q�回�?�Q?br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 函数原型 <strong>BOOL</strong> <strong>Polyline(</strong> <strong>LPPOINT</strong> <em>lpPoints</em><strong>,</strong> <strong>int</strong> <em>nCount/*数目*/</em> <strong>);<br></strong>&nbsp;&nbsp;&nbsp;&nbsp; Rectangle()�Q�根据指定参数绘制一个矩形，成功�q�回�?�Q?br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 函数原型&nbsp; <strong>BOOL</strong> <strong>Rectangle(</strong> <strong>int</strong> <em>x1</em><strong>,</strong> <strong>int</strong> <em>y1</em><strong>,</strong> <strong>int</strong> <em>x2</em><strong>,</strong> <strong>int</strong> <em>y2</em> <strong>);<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; B</strong><strong>OOL</strong> <strong>Rectangle(</strong> <strong>LPCRECT</strong> <em>lpRect</em> <strong>);<br></strong>&nbsp;&nbsp;&nbsp;&nbsp; Ellipse()�Q?�Ҏ(gu��)��指定的矩形绘制一个内切椭圆，成功�q�回�?�Q?br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 函数原型 <strong>BOOL</strong> <strong>Ellipse(</strong> <strong>int</strong> <em>x1</em><strong>,</strong> <strong>int</strong> <em>y1</em><strong>,</strong> <strong>int</strong> <em>x2</em><strong>,</strong> <strong>int</strong> <em>y2</em> <strong>);<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </strong><strong>BOOL</strong> <strong>Ellipse(</strong> <strong>LPCRECT</strong> <em>lpRect</em> <strong>);</strong><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;DrawIcon()�Q�在指定位置��M��个图标，成功�q�回�?�Q?br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 函数原型 <strong>BOOL</strong> <strong>DrawIcon(</strong> <strong>int</strong> <em>x</em><strong>,</strong> <strong>int</strong> <em>y</em><strong>,</strong> <strong>HICON</strong> <em>hIcon</em> <strong>);<br></strong><strong>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;BOOL</strong> <strong>DrawIcon(</strong> <strong>POINT</strong> <em>point</em><strong>,</strong> <strong>HICON</strong> <em>hIcon</em> <strong>);<br></strong>(2)、有��x(ch��ng)��本处理的常用函数�Q?br>&nbsp;&nbsp;&nbsp;&nbsp; TextOut()�Q�在函数参数指定的位�|�显�C�文本串�?br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 函数原型 <strong>virtual</strong> <strong>BOOL</strong> <strong>TextOut(</strong> <strong>int</strong> <em>x</em><strong>,</strong> <strong>int</strong> <em>y</em><strong>,</strong> <strong>LPCTSTR</strong> <em>lpszString</em><strong>,</strong> <strong>int</strong> <em>nCount</em> <strong>);<br></strong><strong>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; BOOL</strong> <strong>TextOut(</strong> <strong>int</strong> <em>x</em>, <strong>int</strong> <em>y</em>, <strong>const</strong> <strong>CString&amp;</strong> <em>str</em> );<br>&nbsp;&nbsp;&nbsp;&nbsp; DrawText()�Q�在函数参数指定的矩形区域内昄���文本丌Ӏ?br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 函数原型 <strong>virtual</strong> <strong>int</strong> <strong>DrawText(</strong> <strong>LPCTSTR</strong> <em>lpszString</em><strong>,</strong> <strong>int</strong> <em>nCount</em><strong>,</strong> <strong>LPRECT</strong> <em>lpRect</em><strong>,</strong> <strong>UINT</strong> <em>nFormat</em> /*�c�d��*/<strong>);<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </strong><strong>int DrawText( const CString&amp; </strong><em>str</em><strong>, LPRECT </strong><em>lpRect</em><strong>, UINT </strong><em>nFormat</em><strong> );<br></strong>&nbsp;&nbsp;&nbsp;&nbsp; SetTextColor()�Q�设�|�显�C�文本的颜色�Q�返回当前文本RGB颜色��|��<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;函数原型 <strong>virtual</strong> <strong>COLORREF</strong> <strong>SetTextColor(</strong> <strong>COLORREF</strong> <em>crColor</em> <strong>);<br>&nbsp;&nbsp;&nbsp;&nbsp; </strong>GetTextColor()�Q�获得当前文本颜�Ԍ�� 函数原型 <strong>COLORREF</strong> <strong>GetTextColor(</strong> <strong>)</strong> <strong>const;<br></strong>&nbsp;&nbsp;&nbsp;&nbsp; SetBkColor()�Q�设�|�显�C�文本的背景颜色�Q�返回当前文本背景RGB颜色��|��<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;函数原型 <strong>virtual</strong> <strong>COLORREF</strong> <strong>SetBkColor(</strong> <strong>COLORREF</strong> <em>crColor</em> <strong>);<br></strong>&nbsp;&nbsp;&nbsp;&nbsp; GetBkColor()�Q�获得当前文本背景颜�Ԍ�� 函数原型 <strong>COLORREF</strong> <strong>GetBkColor(</strong> <strong>)</strong> <strong>const;<br></strong>&nbsp;&nbsp;&nbsp;&nbsp; SetBkMode()�Q�设�|�文本的背景模式�Q�返回当前背景模式��|��<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 函数原型 <strong>int</strong> <strong>SetBkMode(</strong> <strong>int</strong> <em>nBkMode</em> /*模式*/<strong>); TRANSPARENT</strong>透明�Q?strong>OPAQUE</strong> 不透明&nbsp;&nbsp;<br>&nbsp;&nbsp;&nbsp;&nbsp; GetBkMode()�Q�获得当前文本背景模式； 函数原型 <strong>int</strong> <strong>GetBkMode(</strong> <strong>)</strong> <strong>const;<br>&nbsp;&nbsp;&nbsp;&nbsp; </strong>SetTextAlign()�Q�设�|�显�C�文本的寚w��方式�Q�成功返回非0�Q?br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 函数原型&nbsp; <strong>UINT</strong> <strong>SetTextAlign(</strong> <strong>UINT</strong> <em>nFlags</em> <strong>);<br></strong>&nbsp;&nbsp;&nbsp;&nbsp; GetTextAlign()�Q�获得文本的寚w��方式�Q�函数原�?<strong>UINT</strong> <strong>GetTextAlign(</strong> <strong>)</strong> <strong>const;</strong>
<img src ="http://www.shnenglu.com/huxiaofeng/aggbug/110922.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.shnenglu.com/huxiaofeng/" target="_blank">�?/a> 2010-03-29 22:15 <a href="http://www.shnenglu.com/huxiaofeng/archive/2010/03/29/110922.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>如何实现属性表�?/title><link>http://www.shnenglu.com/huxiaofeng/archive/2010/01/21/106180.html</link><dc:creator>�?/dc:creator><author>�?/author><pubDate>Thu, 21 Jan 2010 11:46:00 GMT</pubDate><guid>http://www.shnenglu.com/huxiaofeng/archive/2010/01/21/106180.html</guid><wfw:comment>http://www.shnenglu.com/huxiaofeng/comments/106180.html</wfw:comment><comments>http://www.shnenglu.com/huxiaofeng/archive/2010/01/21/106180.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.shnenglu.com/huxiaofeng/comments/commentRss/106180.html</wfw:commentRss><trackback:ping>http://www.shnenglu.com/huxiaofeng/services/trackbacks/106180.html</trackback:ping><description><![CDATA[概述�Q�创��Z��个属性表单，首先创徏一个CPropertySheet对象�Q��ؓ(f��)每一个属性表单创��Z��个CPropertyPage对象�Q�在CPropertySheet�c�M���Q�在CPropertySheet�cȝ��构造函��C����d��AddPage函数��d��每个属性页�Q�最后在菜单函数中调用DoModal函数来显�C�Z��个静(r��n)态属性表单。属性页<br>是被��d��属性表单的�Q�也���是��_(d��)��属性表单是属性页的父�H�口。因此，可以通过GetParent()函数获得属性页父窗口的指针�Q�即属性表单的<br>指针�Q�但要经�q�类型�{�?br>步骤�Q?br>1、创��Z��个或多个属性页�Q�基�c�Mؓ(f��)CPropertyPage�?br>class CPropSet1 : public CPropertyPage<br>{<br>// Dialog Data<br>&nbsp;//{{AFX_DATA(CPropSet1)<br>&nbsp; enum { IDD = IDD_PROP_SET1 };<br>&nbsp; int&nbsp;&nbsp;m_MAXVALUEX2;<br>&nbsp; int&nbsp;&nbsp;m_MINVALUEX2;<br>&nbsp;//}}AFX_DATA<br>}<br>2、徏立CProp表单�Q�基�c�Mؓ(f��)CPropertySheet�?br>CPropSheet::CPropSheet(UINT nIDCaption, CWnd* pParentWnd, UINT iSelectPage)<br>&nbsp;:CPropertySheet(nIDCaption, pParentWnd, iSelectPage)<br>{<br>&nbsp;&nbsp; AddPage(&amp;m_propSet1); //军_��page��序<br>&nbsp;&nbsp; AddPage(&amp;m_propSet2);<br>}<br>3、菜单函敎ͼ�(x��)<br>void CDataView::OnPropsheet() <br>{<br>&nbsp;// TODO: Add your command handler code here<br>&nbsp;&nbsp; CPropSheet propSheet("参数讄���"); //表单名称�Q�其他�ؓ(f��)�~�省变量<br>&nbsp;<br>&nbsp;&nbsp; propSheet.m_propSet1.m_MAXVALUEX2=m_XValueMax;<br>&nbsp;&nbsp; propSheet.m_propSet1.m_MINVALUEX2=m_XValueMin;<br>&nbsp;<br>&nbsp;if(&nbsp;IDOK==propSheet.DoModal())<br>&nbsp;{<br>&nbsp;&nbsp;&nbsp;&nbsp;m_ChartCtrl1.EnableRefresh(false);<br>&nbsp;&nbsp; &nbsp;m_XValueMax=propSheet.m_propSet1.m_MAXVALUEX2;<br>&nbsp;&nbsp;&nbsp; m_XValueMin=propSheet.m_propSet1.m_MINVALUEX2;<br>&nbsp;&nbsp; &nbsp;m_ChartCtrl1.GetBottomAxis()-&gt;SetMinMax(m_XValueMin,m_XValueMax);<br>&nbsp;&nbsp;&nbsp; m_ChartCtrl1.EnableRefresh(true);<br>&nbsp;}<br>}<br>4、徏立向��|��(x��)<br>首先在调用属性表单对象的DoModal函数之前�Q�调用SetWizardMode函数�?br>&nbsp;&nbsp;&nbsp; propSheet.SetWizardMode();<br>然后通过SetWizardButtons函数讄���向导对话框上的按钮�?br>&nbsp;((CPropSheet*)GetParent())-&gt;SetWizardButtons(PSWIZB_NEXT);<br>&nbsp;((CPropSheet*)GetParent())-&gt;SetWizardButtons(PSWIZB_NEXT | PSWIZB_BACK);<br>&nbsp;((CPropSheet*)GetParent())-&gt;SetWizardButtons(PSWIZB_BACK | PSWIZB_FINISH);<br><br>注意点：(x��)需�Ҏ(gu��)��字种�c�d���c�d���?
<img src ="http://www.shnenglu.com/huxiaofeng/aggbug/106180.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.shnenglu.com/huxiaofeng/" target="_blank">�?/a> 2010-01-21 19:46 <a href="http://www.shnenglu.com/huxiaofeng/archive/2010/01/21/106180.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>实现���单打印预览功�?/title><link>http://www.shnenglu.com/huxiaofeng/archive/2009/12/31/104562.html</link><dc:creator>�?/dc:creator><author>�?/author><pubDate>Thu, 31 Dec 2009 07:26:00 GMT</pubDate><guid>http://www.shnenglu.com/huxiaofeng/archive/2009/12/31/104562.html</guid><wfw:comment>http://www.shnenglu.com/huxiaofeng/comments/104562.html</wfw:comment><comments>http://www.shnenglu.com/huxiaofeng/archive/2009/12/31/104562.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.shnenglu.com/huxiaofeng/comments/commentRss/104562.html</wfw:commentRss><trackback:ping>http://www.shnenglu.com/huxiaofeng/services/trackbacks/104562.html</trackback:ping><description><![CDATA[<p>打印预览实现���程�Q?br>&nbsp;&nbsp;&nbsp;&nbsp; 首先调用CFormView::OnFilePrintPreview�Q�再依次调用自己的所重写的虚函数OnPreparePrinting(CPrintInfo* pInfo)、OnBeginPrinting(CDC* pDC, CPrintInfo* pInfo)、OnPrint(CDC* pDC, CPrintInfo* pInfo)、CFormView::OnPrint(pDC, pInfo);�Q�当关闭打印预览时调用OnEndPrinting(CDC* pDC, CPrintInfo* pInfo)&nbsp;&nbsp;�Q�结束打印�?br>部分代码�Q?br>&nbsp; ON_COMMAND(ID_FILE_PRINT_PREVIEW, CFormView::OnFilePrintPreview)<br>&nbsp;&nbsp;BOOL CElectronValveView::OnPreparePrinting(CPrintInfo* pInfo)<br>{<br>&nbsp;// default preparation<br>&nbsp; pInfo-&gt;SetMinPage(1);&nbsp;//讄���打印文�g起始��?nbsp;<br>&nbsp; pInfo-&gt;SetMaxPage(1);&nbsp;//讄���打印文�g�l�止��?br>&nbsp; return&nbsp;&nbsp; DoPreparePrinting(pInfo);<br>}&nbsp; <br>void CElectronValveView::OnBeginPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)<br>{<br>&nbsp;// TODO: add extra initialization before printing<br>&nbsp; m_ChartCtrl.GetBottomAxis()-&gt;GetGrid()-&gt;SetColor(BlackColor);//讄���栅格颜色为黑�Ԍ��不然打印的时候太�?br>&nbsp; m_ChartCtrl.GetLeftAxis()-&gt;GetGrid()-&gt;SetColor(BlackColor);<br>}<br>void CElectronValveView::OnEndPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)<br>{<br>&nbsp;// TODO: add cleanup after printing<br>&nbsp;m_ChartCtrl.GetBottomAxis()-&gt;GetGrid()-&gt;SetColor(BlueColor);//恢复颜色�Q�不然控件中也是�q�个颜色�?ji��n)�?br>&nbsp;m_ChartCtrl.GetLeftAxis()-&gt;GetGrid()-&gt;SetColor(BlueColor);<br>}<br>void CElectronValveView::OnPrint(CDC* pDC, CPrintInfo* pInfo)<br>{<br>&nbsp;// TODO: add customized printing code here<br>&nbsp;CMainFrame* pMain=(CMainFrame *)AfxGetApp()-&gt;m_pMainWnd&nbsp;<br>&nbsp;CDC *pCurrentDC = GetDC();&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // will have dimensions of the client area<br>&nbsp;CSize PaperPixelsPerInch(pDC-&gt;GetDeviceCaps(LOGPIXELSX), pDC-&gt;GetDeviceCaps(LOGPIXELSY));<br>&nbsp;//获得打印�U�设备每英寸的像素数�Q�应该是一��L(f��ng)���?br>&nbsp;&nbsp;&nbsp; CSize ScreenPixelsPerInch(pCurrentDC-&gt;GetDeviceCaps(LOGPIXELSX), pCurrentDC-&gt;GetDeviceCaps(LOGPIXELSY));<br>&nbsp;//应该是获得屏�q�的每英寸的像素敎ͼ�应该是一��L(f��ng)��<br>&nbsp;<br>&nbsp;CSize m_PaperSize,m_LogicalPageSize;<br>&nbsp;m_PaperSize = CSize(pDC-&gt;GetDeviceCaps(HORZRES), pDC-&gt;GetDeviceCaps(VERTRES));<br>&nbsp;//把纸张所得的像素对应的屏�q�大���得到�?br>&nbsp;m_LogicalPageSize.cx = ScreenPixelsPerInch.cx * m_PaperSize.cx / PaperPixelsPerInch.cx * 3 / 4;<br>&nbsp;m_LogicalPageSize.cy = ScreenPixelsPerInch.cy * m_PaperSize.cy / PaperPixelsPerInch.cy * 3 / 4;<br>&nbsp;<br>&nbsp;//�q�里必须�q�样设，是�ؓ(f��)�?ji��n)和ChartCtrl中的打印对应��h���?br>&nbsp;&nbsp;&nbsp; pDC-&gt;SetMapMode(MM_ANISOTROPIC);<br>&nbsp;&nbsp;&nbsp; pDC-&gt;SetWindowExt(m_LogicalPageSize);<br>&nbsp;&nbsp;&nbsp; pDC-&gt;SetViewportExt(m_PaperSize);&nbsp;&nbsp;&nbsp;&nbsp;<br>&nbsp;&nbsp; &nbsp;pDC-&gt;SetWindowOrg(0, 0);&nbsp;&nbsp;&nbsp;<br>&nbsp;<br>&nbsp;CRect rcClient,rcClient1;<br>&nbsp;GetClientRect(&amp;rcClient1);&nbsp;//得到的仍然是打印预览昄���客户区的大小<br>&nbsp;rcClient=pInfo-&gt;m_rectDraw;//打印�U�的客户�?br>&nbsp;double ratioX,ratioY;<br>&nbsp;ratioX=(double)rcClient.right/(double)rcClient1.Width();<br>&nbsp;ratioY=(double)rcClient.bottom/(double)rcClient1.Height();<br>&nbsp;int nWid,left,right;<br>&nbsp;CFont *pOldFont;<br>&nbsp;CFont fnBig,fnBig1;<br>&nbsp;CPen Pen,*OldPen;<br>&nbsp;<br>&nbsp;//��M���?br>&nbsp;Pen.CreatePen(PS_SOLID,2,RGB(0,0,0));<br>&nbsp;OldPen=pDC-&gt;SelectObject(&amp;Pen);<br>&nbsp;pDC-&gt;Rectangle(20,20,m_LogicalPageSize.cx-20,m_LogicalPageSize.cy-20);<br>&nbsp;pDC-&gt;SelectObject(OldPen);</p>
<p>&nbsp;//��L��题栏<br>&nbsp;pDC-&gt;MoveTo(20,60);<br>&nbsp;pDC-&gt;LineTo(m_LogicalPageSize.cx-20,60);<br>&nbsp;pDC-&gt;MoveTo(20,85);<br>&nbsp;pDC-&gt;LineTo(m_LogicalPageSize.cx-20,85);<br>&nbsp;pDC-&gt;SelectObject(&amp;Pen);<br>&nbsp;pDC-&gt;MoveTo(20,110);<br>&nbsp;pDC-&gt;LineTo(m_LogicalPageSize.cx-20,110);<br>&nbsp;pDC-&gt;SelectObject(OldPen);<br>&nbsp;pDC-&gt;MoveTo(196,60);&nbsp;<br>&nbsp;pDC-&gt;LineTo(196,110);<br>&nbsp;pDC-&gt;MoveTo(390,60);&nbsp;<br>&nbsp;pDC-&gt;LineTo(390,110);</p>
<p>&nbsp;//�ȝ��果栏<br>&nbsp;pDC-&gt;MoveTo(20,430);&nbsp;<br>&nbsp;pDC-&gt;LineTo(m_LogicalPageSize.cx-20,430);<br>&nbsp;pDC-&gt;MoveTo(85,430);&nbsp;<br>&nbsp;pDC-&gt;LineTo(85,470);//���量�l�果1分界�U�竖�U?br>&nbsp;pDC-&gt;MoveTo((m_LogicalPageSize.cx-85-100)/4+85,430);//开启响应时间分界线&nbsp;<br>&nbsp;pDC-&gt;LineTo((m_LogicalPageSize.cx-85-100)/4+85,470);<br>&nbsp;pDC-&gt;MoveTo((m_LogicalPageSize.cx-85-100)/4*2+85,430);&nbsp;<br>&nbsp;pDC-&gt;LineTo((m_LogicalPageSize.cx-85-100)/4*2+85,470);<br>&nbsp;pDC-&gt;MoveTo((m_LogicalPageSize.cx-85-100)/4*3+85,430);&nbsp;<br>&nbsp;pDC-&gt;LineTo((m_LogicalPageSize.cx-85-100)/4*3+85,470);<br>&nbsp;pDC-&gt;MoveTo((m_LogicalPageSize.cx-85-100)/4*4+85,430);&nbsp;<br>&nbsp;pDC-&gt;LineTo((m_LogicalPageSize.cx-85-100)/4*4+85,470);<br>&nbsp;pDC-&gt;MoveTo(20,450);&nbsp;<br>&nbsp;pDC-&gt;LineTo(m_LogicalPageSize.cx-20,450);<br>&nbsp;pDC-&gt;SelectObject(&amp;Pen);<br>&nbsp;pDC-&gt;MoveTo(20,470);&nbsp;<br>&nbsp;pDC-&gt;LineTo(m_LogicalPageSize.cx-20,470);&nbsp;<br>&nbsp;pDC-&gt;SelectObject(OldPen);</p>
<p>&nbsp;&nbsp;//写标�?br>&nbsp;fnBig.CreatePointFont(200,"黑体",pDC);<br>&nbsp;pOldFont=pDC-&gt;SelectObject(&amp;fnBig);<br>&nbsp;<br>&nbsp;nWid=rcClient1.Width();<br>&nbsp;left=rcClient1.left;<br>&nbsp;right=rcClient1.right;<br>&nbsp;pDC-&gt;SetTextAlign(TA_CENTER);<br>&nbsp;pDC-&gt;TextOut(m_LogicalPageSize.cx/2,30,"XXX性能���试报告");<br>&nbsp;fnBig.DeleteObject();<br>&nbsp;fnBig.CreatePointFont(110,"�?hu��)�?,pDC);<br>&nbsp;pOldFont=pDC-&gt;SelectObject(pOldFont);<br>&nbsp;pOldFont=pDC-&gt;SelectObject(&amp;fnBig);<br>&nbsp;pDC-&gt;SetTextAlign(TA_LEFT);<br>&nbsp;pDC-&gt;TextOut(25,67,"产品名称�Q?+pMain-&gt;m_strProductName);<br>&nbsp;pDC-&gt;TextOut(25,92,"产品囑֏��Q?+pMain-&gt;m_strProductPictureNo);<br>&nbsp;pDC-&gt;TextOut(201,67,"���(g��)���时��_(d��)��(x��)"+pMain-&gt;m_strMeasureTime0);<br>&nbsp;pDC-&gt;TextOut(201,92,"生��厂家�Q?+pMain-&gt;m_strProductFactory);<br>&nbsp;pDC-&gt;TextOut(395,67,"产品�~�号�Q?+pMain-&gt;m_strProductBianHao);<br>&nbsp;pDC-&gt;TextOut(395,92,"���(g��) �?员：(x��)"+pMain-&gt;m_strMeasurerName);</p>
<p>&nbsp;CString aa;<br>&nbsp;aa.Format("%d(ms)",m_iPreviousTime1);<br>&nbsp;fnBig.DeleteObject();<br>&nbsp;fnBig.CreatePointFont(85,"�?hu��)�?,pDC);<br>&nbsp;pDC-&gt;SelectObject(&amp;fnBig);<br>&nbsp;pDC-&gt;TextOut(25,420,"预置�?sh��)信��h����_(d��)��(x��)"+aa);<br>&nbsp;aa.Format("%d",m_iCurveNumber1);<br>&nbsp;pDC-&gt;TextOut(150,420,"曲线数量�Q?+aa);<br>&nbsp;fnBig1.CreatePointFont(100,"�?hu��)�?,pDC);<br>&nbsp;pOldFont=pDC-&gt;SelectObject(&amp;fnBig1);<br>&nbsp;pDC-&gt;TextOut(25,455,"���试�l�果");&nbsp;<br>&nbsp;pDC-&gt;TextOut(90,435,"开启响应时�?ms)");<br>&nbsp;pDC-&gt;TextOut(120,455,m_strOpenResponseTime);<br>&nbsp;pDC-&gt;TextOut((m_LogicalPageSize.cx-85-100)/4+85+5,435,"开启换向时�?ms)");<br>&nbsp;pDC-&gt;TextOut((m_LogicalPageSize.cx-85-100)/4+85+5+30,455,m_strOpenInvertTime);<br>&nbsp;pDC-&gt;TextOut((m_LogicalPageSize.cx-85-100)/4*2+85+5,435,"关闭响应旉���(ms)");<br>&nbsp;pDC-&gt;TextOut((m_LogicalPageSize.cx-85-100)/4*2+85+5+30,455,m_strCloseResponseTime);<br>&nbsp;pDC-&gt;TextOut((m_LogicalPageSize.cx-85-100)/4*3+85+5,435,"关闭换向旉���(ms)");<br>&nbsp;pDC-&gt;TextOut((m_LogicalPageSize.cx-85-100)/4*3+85+5+30,455,m_strCloseInvertTime);&nbsp;<br>&nbsp;pDC-&gt;TextOut((m_LogicalPageSize.cx-85-100)/4*4+85+10,435,"���(g��)���结�?);<br>&nbsp;<br>&nbsp;//最后一�?br>&nbsp;fnBig.DeleteObject();<br>&nbsp;fnBig.CreatePointFont(130,"�?hu��)�?,pDC);<br>&nbsp;pDC-&gt;SelectObject(&amp;fnBig);<br>&nbsp;pDC-&gt;TextOut(m_LogicalPageSize.cx-180,m_LogicalPageSize.cy-20-20,"审核�Q?);<br>&nbsp;pDC-&gt;SetTextAlign(TA_LEFT);</p>
<p>&nbsp;CPoint offset(16,110);<br>&nbsp;m_ChartCtrl.Print1(offset,pDC,pInfo,0);//调用chart�c�L��画表格和曲线<br>&nbsp;fnBig.DeleteObject();</p>
<p>&nbsp;CFormView::OnPrint(pDC, pInfo);<br>}<br>本程序利用ChartCtrl来实现绘制表格和曲线�?/p>
<img src ="http://www.shnenglu.com/huxiaofeng/aggbug/104562.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.shnenglu.com/huxiaofeng/" target="_blank">�?/a> 2009-12-31 15:26 <a href="http://www.shnenglu.com/huxiaofeng/archive/2009/12/31/104562.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>����q�如何实现简单预�?/title><link>http://www.shnenglu.com/huxiaofeng/archive/2009/12/30/104486.html</link><dc:creator>�?/dc:creator><author>�?/author><pubDate>Wed, 30 Dec 2009 13:03:00 GMT</pubDate><guid>http://www.shnenglu.com/huxiaofeng/archive/2009/12/30/104486.html</guid><wfw:comment>http://www.shnenglu.com/huxiaofeng/comments/104486.html</wfw:comment><comments>http://www.shnenglu.com/huxiaofeng/archive/2009/12/30/104486.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.shnenglu.com/huxiaofeng/comments/commentRss/104486.html</wfw:commentRss><trackback:ping>http://www.shnenglu.com/huxiaofeng/services/trackbacks/104486.html</trackback:ping><description><![CDATA[<p>步骤1�Q�添加新�c�CDIBStatic�Q�类型�ؓ(f��)MFC Class�Q�基�c�Mؓ(f��)CStatic�?br>步骤2�Q�在工程中加入CPictureObj.h和CPictureObj.cpp�Q�及(qi��ng)CIstream.h和CIstream.cpp�?br>步骤3�Q�在�c�CDIBStatic加入头文�?include "PictureObj.h"�Q�添加变量CPictureObj* m_pPicObj;�Q�用于读取和昄���。CPictureObj中封装了(ji��n)IPicture接口�?br>步骤4�Q�新��Z��Dialog�Q�加入控件picture�Q�类型�ؓ(f��)MFC Class�Q�基�c�Mؓ(f��)CfileDlg�?br>部分代码�Q?br>CDIBStatic源代码：(x��)<br>OOL CDIBStatic::LoadDib(LPCTSTR lpszFileName)//��d��<br>{<br>&nbsp;try//利用try语句当文件第一�ơ打开时lpszFileName�?x��)出错，在catch中捕获将其设�|��ؓ(f��)NULL<br>lpszFileName = lpszFileName;<br>&nbsp;&nbsp;// ���保文�g存在�q�能打开<br>&nbsp;&nbsp;CFile file(lpszFileName, CFile::modeRead);<br>&nbsp;&nbsp;file.Close();</p>
<p>// 创徏囑փ�昄���的对象�ƈ��d��囑փ�文�g<br>&nbsp;&nbsp;m_pPicObj = new CPictureObj;<br>&nbsp;&nbsp;if(!m_pPicObj-&gt;Load(lpszFileName))<br>&nbsp;&nbsp;{<br>&nbsp;&nbsp;&nbsp;// ��d��文�g��p�|�Q�清除对�?br>&nbsp;&nbsp;&nbsp;m_pPicObj = NULL;<br>&nbsp;&nbsp;&nbsp;delete m_pPicObj;<br>&nbsp;&nbsp;&nbsp;// 清除昄���的图像�ƈ昄���错误提示<br>&nbsp;&nbsp;&nbsp;PaintDib(IsValidDib());<br>&nbsp;&nbsp;&nbsp;return FALSE;<br>&nbsp;&nbsp;}<br>&nbsp;&nbsp;PaintDib(IsValidDib());<br>&nbsp;&nbsp;return TRUE;<br>&nbsp;}<br>&nbsp;catch (CFileException* e)<br>&nbsp;{<br>&nbsp;&nbsp;m_lpszFileName = NULL;<br>&nbsp;&nbsp;PaintDib(IsValidDib());<br>&nbsp;&nbsp;e-&gt;Delete();<br>&nbsp;&nbsp;return FALSE;<br>&nbsp;}<br>}</p>
<p>void CDIBStatic::PaintDib(BOOL bDibValid)//昄���<br>{<br>&nbsp;ASSERT_VALID(this);<br>&nbsp;ClearDib(); // 清除以前的图�?br>&nbsp;&nbsp;<br>&nbsp;CRect PaintRect;<br>&nbsp;// 获得昄���区域<br>&nbsp;GetClientRect(&amp;PaintRect);&nbsp;&nbsp;&nbsp; <br>&nbsp;PaintRect.InflateRect(-1, -1);<br>&nbsp;CClientDC dc(this);</p>
<p>&nbsp;if (bDibValid &amp;&amp; m_bPreview)<br>&nbsp;{<br>&nbsp;&nbsp;CSize size = m_pPicObj-&gt;GetSize(&amp;dc);<br>&nbsp;&nbsp;int nDestX, nDestY, nDestWidth, nDestHeight;<br>&nbsp;&nbsp;if ((DWORD)size.cx &lt; (DWORD)PaintRect.Width() &amp;&amp; (DWORD)size.cy &lt; (DWORD)PaintRect.Height())<br>&nbsp;&nbsp;{ // 囑փ����寸���于昄���区域���图像显�C�在中间<br>&nbsp;&nbsp;&nbsp;nDestX = PaintRect.left + (PaintRect.Width() - size.cx)/2;<br>&nbsp;&nbsp;&nbsp;nDestY = PaintRect.top + (PaintRect.Height() - size.cy)/2;<br>&nbsp;&nbsp;&nbsp;nDestWidth = size.cx;<br>&nbsp;&nbsp;&nbsp;nDestHeight = size.cy;<br>&nbsp;&nbsp;}<br>&nbsp;&nbsp;else<br>&nbsp;&nbsp;{ // 囑փ����寸大于昄���区域�Q�进行比例羃�?<br>&nbsp;&nbsp;&nbsp;if ((PaintRect.Width()/(float)size.cx) &lt;= (PaintRect.Height()/(float)size.cy))<br>&nbsp;&nbsp;&nbsp;{ // 宽度限制<br>&nbsp;&nbsp;&nbsp;&nbsp;nDestWidth = PaintRect.Width();<br>&nbsp;&nbsp;&nbsp;&nbsp;nDestHeight = (nDestWidth*size.cy) / size.cx;<br>&nbsp;&nbsp;&nbsp;&nbsp;nDestX = PaintRect.left;<br>&nbsp;&nbsp;&nbsp;&nbsp;nDestY = PaintRect.top + (PaintRect.Height() - nDestHeight) /2;<br>&nbsp;&nbsp;&nbsp;}<br>&nbsp;&nbsp;&nbsp;else<br>&nbsp;&nbsp;&nbsp;{ // 高度限制&nbsp;&nbsp;<br>&nbsp;&nbsp;&nbsp;&nbsp;nDestHeight = PaintRect.Height();<br>&nbsp;&nbsp;&nbsp;&nbsp;nDestWidth = (nDestHeight*size.cx) / size.cy;<br>&nbsp;&nbsp;&nbsp;&nbsp;nDestX = PaintRect.left + (PaintRect.Width() - nDestWidth) /2;<br>&nbsp;&nbsp;&nbsp;&nbsp;nDestY = PaintRect.top;<br>&nbsp;&nbsp;&nbsp;}<br>&nbsp;&nbsp;}</p>
<p>&nbsp;&nbsp;// 获得囑փ�的显�C�Z���|�和大小<br>&nbsp;&nbsp;CRect RectDest(nDestX, nDestY, nDestX+nDestWidth, nDestY+nDestHeight);<br>&nbsp;&nbsp;// 昄���囑փ�<br>&nbsp;&nbsp;m_pPicObj-&gt;Draw(&amp;dc,&amp;RectDest,&amp;RectDest);<br>&nbsp;&nbsp;// �l�图像加一外框<br>&nbsp;&nbsp;CBrush*&nbsp; pOldBrush&nbsp; = (CBrush*)dc.SelectStockObject(NULL_BRUSH);&nbsp;&nbsp; <br>&nbsp;&nbsp;dc.Rectangle(RectDest);<br>&nbsp;&nbsp;if(NULL != pOldBrush)&nbsp; { dc.SelectObject(pOldBrush);&nbsp; }<br>&nbsp;}<br>&nbsp;else<br>&nbsp;{<br>&nbsp;&nbsp;// 昄���错误提示信息<br>&nbsp;&nbsp;CString strText = "不能识别的文件格�?";<br>&nbsp;&nbsp;if( m_lpszFileName == NULL || strlen(m_lpszFileName) &lt;= 0 )<br>&nbsp;&nbsp;{<br>&nbsp;&nbsp;&nbsp;strText = "没有选择文�g!";<br>&nbsp;&nbsp;}<br>&nbsp;&nbsp;if( !m_bPreview )<br>&nbsp;&nbsp;{<br>&nbsp;&nbsp;&nbsp;strText = "";<br>&nbsp;&nbsp;}<br>&nbsp;&nbsp;dc.DrawText(strText, strText.GetLength(), &amp;PaintRect, DT_SINGLELINE|DT_CENTER|DT_VCENTER|DT_END_ELLIPSIS);<br>&nbsp;}<br>&nbsp;&nbsp;<br>&nbsp;return;<br>}</p>
<p>HBRUSH CDIBSatic::CtlColor(CDC* pDC, UINT nCtlColor)//用于重绘 <br>{<br>&nbsp;// TODO: Change any attributes of the DC here<br>&nbsp;PaintDib(IsValidDib());<br>&nbsp;return (HBRUSH)GetStockObject(NULL_BRUSH);<br>}<br>BOOL IsValidDib() const { return (m_pPicObj &amp;&amp; m_pPicObj-&gt;m_pPict); }<br>void CDIBSatic::ClearDib()//清除囄���<br>{<br>&nbsp;ASSERT_VALID(this);<br>&nbsp;<br>&nbsp;CClientDC dc(this);<br>&nbsp;CRect rectPaint;<br>&nbsp;&nbsp;&nbsp; <br>&nbsp;GetClientRect(&amp;rectPaint);&nbsp;&nbsp;&nbsp; <br>&nbsp;rectPaint.InflateRect(-1,-1);<br>&nbsp;&nbsp;&nbsp;&nbsp; <br>&nbsp;CBrush* pBrushWhite; //白画�?br>&nbsp;pBrushWhite = CBrush::FromHandle((HBRUSH)::GetStockObject(WHITE_BRUSH));<br>&nbsp;&nbsp;&nbsp; <br>&nbsp;dc.FillRect(&amp;rectPaint, pBrushWhite);<br>}<br>void RemoveDib() { m_lpszFileName = NULL; delete m_pPicObj; m_pPicObj = NULL; PaintDib(IsValidDib()); }<br>&nbsp;void SetPreview(BOOL bPreview) { m_bPreview = bPreview;&nbsp;PaintDib(IsValidDib()); }<br>CPreviewFileDlg源代码：(x��)<br>BOOL CPreviewFileDlg::OnInitDialog() <br>{<br>&nbsp;CFileDialog::OnInitDialog();<br>&nbsp;m_DIBStaticCtrl.SubclassDlgItem(IDC_IMAGE, this);<br>&nbsp;CWnd* pParent = GetParent();<br>&nbsp;CRect rcParent;<br>&nbsp;pParent-&gt;GetClientRect(&amp;rcParent);<br>&nbsp;CRect rcPrev;<br>&nbsp;GetDlgItem(IDC_PREVIEW)-&gt;GetClientRect(&amp;rcPrev); //复选框<br>&nbsp;CRect rc;<br>&nbsp;m_DIBStaticCtrl.GetClientRect(&amp;rc); <br>&nbsp;int height = rc.Height();<br>&nbsp;rc.top = rcPrev.bottom - 10;//囑փ�框设�|?br>&nbsp;rc.bottom = rc.top + height ;<br>&nbsp;rc.left = 50;<br>&nbsp;rc.right = rcParent.Width() - rc.left;<br>&nbsp;m_DIBStaticCtrl.MoveWindow(&amp;rc, true);</p>
<p>&nbsp;GetDlgItem(IDC_PREVIEW)-&gt;SendMessage(BM_SETCHECK, (m_bPreview) ? 1 : 0);<br>&nbsp;<br>&nbsp;return TRUE;&nbsp; // return TRUE unless you set the focus to a control<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // EXCEPTION: OCX Property Pages should return FALSE<br>}<br>void CPreviewFileDlg::OnFileNameChange()<br>{<br>&nbsp;CFileDialog::OnFileNameChange();<br>&nbsp;if (m_bPreview)<br>&nbsp;{<br>&nbsp;&nbsp;m_DIBStaticCtrl.SetPreview(m_bPreview);//昄���囄���<br>&nbsp;&nbsp;m_DIBStaticCtrl.LoadDib(GetPathName()); //加蝲<br>&nbsp;}</p>
<p>}//当点�?y��n)L��件时调用<br>void CPreviewFileDlg::OnFolderChange()<br>{<br>&nbsp;CFileDialog::OnFolderChange();<br>&nbsp;m_DIBStaticCtrl.RemoveDib();//清除<br>}<br>菜单栏源代码�Q?br>void CPreviewDlg::OnPreview() <br>{<br>&nbsp;// TODO: Add extra validation here<br>&nbsp;&nbsp;&nbsp; static char BASED_CODE szFilter[] = "Bitmap(*.bmp)|*.bmp|JPEG(*.jpg)|*.jpg|GIF(*.gif)|*.gif|WMF(*.wmf)|*.wmf|ICON(*.ico)|*.ico||";<br>&nbsp;CString strDefName;</p>
<p>&nbsp;char szPath[MAX_PATH];//最大目录大��?br>&nbsp;<br>&nbsp;&nbsp;&nbsp; CPreviewFileDlg FileDlg(TRUE,"*.*",NULL,<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; OFN_FILEMUSTEXIST|OFN_NONETWORKBUTTON|<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; OFN_PATHMUSTEXIST,szFilter);<br>&nbsp;FileDlg.m_ofn.lpstrInitialDir = szPath;<br>&nbsp;&nbsp;&nbsp; if( FileDlg.DoModal() != IDOK )<br>&nbsp;&nbsp;return;</p>
<p>&nbsp;&nbsp;&nbsp; // To get the selected file's path and name<br>&nbsp;&nbsp;&nbsp; CString strFileName;<br>&nbsp;&nbsp;&nbsp; strFileName = FileDlg.GetPathName();</p>
<p>&nbsp;&nbsp;&nbsp; if(strFileName.IsEmpty())<br>&nbsp;&nbsp;&nbsp; {<br>&nbsp;&nbsp;return;<br>&nbsp;}<br>}</p>
<img src ="http://www.shnenglu.com/huxiaofeng/aggbug/104486.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.shnenglu.com/huxiaofeng/" target="_blank">�?/a> 2009-12-30 21:03 <a href="http://www.shnenglu.com/huxiaofeng/archive/2009/12/30/104486.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>���谈malloc()和free()</title><link>http://www.shnenglu.com/huxiaofeng/archive/2009/12/03/102452.html</link><dc:creator>�?/dc:creator><author>�?/author><pubDate>Thu, 03 Dec 2009 03:50:00 GMT</pubDate><guid>http://www.shnenglu.com/huxiaofeng/archive/2009/12/03/102452.html</guid><wfw:comment>http://www.shnenglu.com/huxiaofeng/comments/102452.html</wfw:comment><comments>http://www.shnenglu.com/huxiaofeng/archive/2009/12/03/102452.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.shnenglu.com/huxiaofeng/comments/commentRss/102452.html</wfw:commentRss><trackback:ping>http://www.shnenglu.com/huxiaofeng/services/trackbacks/102452.html</trackback:ping><description><![CDATA[&nbsp;
<p><strong><span>一�?/span></strong><strong><span>malloc()</span></strong><strong><span>�?/span></strong><strong><span>free()</span></strong><strong><span>的基本概念以�?qi��ng)基本用法�?x��)</span></strong><strong></strong></p>
<p><span>1</span><span>、函数原型及(qi��ng)说明�Q?/span></p>
<p><strong><span>void *malloc(long NumBytes)</span></strong><span>�Q?/span></p>
<p><span>该函数分配了(ji��n)</span><span>NumBytes</span><span>个字节，�q�返回了(ji��n)指向�q�块内存的指针。如果分配失败，则返回一个空指针�Q?/span><span>NULL</span><span>�Q��?/span></p>
<p><span>关于分配��p�|的原因，应该有多�U�，比如说空间不���_��是一�U��?/span></p>
<p><strong><span>void free(void *FirstByte)</span></strong><strong><span>�Q?/span></strong></p>
<p><span>该函数是���之前用</span><span>malloc</span><span>分配的空间还�l�程序或者是操作�pȝ���Q�也���是释放�?ji��n)这块内存，让它重新得到自由�?/span></p>
<p><span>2</span><span>、函数的用法�Q?/span></p>
<p><span><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span><span>其实�q�两个函数用��h��倒不是很难，也就�?/span><span>malloc()</span><span>之后觉得用够�?ji��n)就甩�?ji��n)它把它给</span><span>free()</span><span>�?ji��n)，举个���单例子：(x��)</span></p>
<p><span>�E�序代码�Q?/span></p>
<p><span><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>// Code... </span></p>
<p><span><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;float *YValue; </span></span></p>
<p><span><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span><strong>&nbsp;YValue=(float *)malloc(DataNumberMax*sizeof(float));&nbsp; //动态分配内�?/strong></span></p>
<p><span><span>&nbsp;&nbsp;&nbsp;&nbsp;<strong>&nbsp;&nbsp;&nbsp;&nbsp; </strong></span><strong>if (NULL == YValue)&nbsp;</strong></span><span><strong><span>&nbsp; </span>exit (1);</strong></span></p>
<p><span><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>gets(<strong>YValue</strong>); </span></p>
<p><span><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>// code... </span></p>
<p><span><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span><strong>free(YValue); </strong></span></p>
<p><span><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span><strong>YValue</strong>= NULL; </span></p>
<p><span><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>// code... </span></p>
<p><span><span>&nbsp;&nbsp;&nbsp;&nbsp; </span></span><span>���是�q�样�Q�当�?d��ng)���具体情况要具体分析以及(qi��ng)具体解冟뀂比如说�Q�你定义�?ji��n)一个指针，在一个函数里甌����?ji��n)一块内存然后通过函数�q�回传递给�q�个指针�Q�那么也�?d��ng)R��放这块内存这��工作就应该留给其他函数�?ji��n)�?/span></p>
<p><span>3</span><span>、关于函��C��用需�?strong>注意</strong>的一些地方：(x��)</span></p>
<p><span>A</span><span>、申请了(ji��n)内存�I�间后，必须<strong>���(g��)�?/strong>是否分配成功�?/span></p>
<p><span>B</span><span>、当不需要再使用甌���的内存时�Q�记�?strong>释放</strong>�Q�释攑֐�应该把指向这块内存的指针指向</span><span>NULL</span><span>�Q�防止程序后面不���心(j��)使用�?ji��n)它�?/span></p>
<p><span>C</span><span>、这两个函数应该�?strong>配对</strong>。如果申请后不释攑ְ�是内存泄�Ԍ��如果无故释放那就是什么也没有做。释攑֏�能一�ơ，如果释放两次�?qi��ng)两�ơ以上�?x��)出现错误�Q�释攄���指针例外�Q�释攄���指针其实也等于啥也没做，所以释攄���指针释放多少�ơ都没有问题�Q��?/span></p>
<p><span>D</span><span>、虽�?/span><span>malloc()</span><span>函数的类型是</span><span>(void *),</span><span>��M���c�d��的指针都可以转换�?/span><span>(void *),</span><span>但是最好还是在前面�q�行<strong>强制�c�d��转换</strong>�Q�因�����样可以躲�q�一些编译器的检查�?br><br></span></p>
<p><strong><span>二�?/span></strong><strong><span>malloc()</span></strong><strong><span>到底从哪里得来了(ji��n)内存�I�间�Q?/span></strong><strong></strong></p>
<p>&nbsp;</p>
<p><span>1</span><span>�?/span> <strong><span>malloc()</span></strong><strong><span>到底从哪里得��C��(ji��n)内存�I�间�Q?/span> </strong><strong><span>�{�案是从堆里面获得空间�?/span></strong><span>也就是说函数�q�回的指针是<strong>指向堆里面的一块内�?/strong>。操作系�l�中有一个记录空闲内存地址的链表。当操作�pȝ��收到�E�序的申��h���Q�就�?x��)遍历该链表�Q�然后就��L���W�一个空间大于所甌����I�间的堆�l�点�Q�然后就���该�l�点从空闲结炚w��表中删除�Q��ƈ���该�l�点的空间分配给�E�序。就是这��P��</span></p>
<p><span>2</span><span>�?strong>什么是堆：(x��)堆是大家共有的空��_(d��)��分全局堆和局部堆�?/strong>全局堆就是所有没有分配的�I�间�Q�局部堆���是用户分配的空间。堆在操作系�l�对�q�程</span> <span>初始化的时候分配，�q�行�q�程中也可以向系�l�要额外的堆�Q�但是记得用完了(ji��n)要还�l�操作系�l�，要不然就是内存泄漏�?/span></p>
<p><span><span>&nbsp;&nbsp;&nbsp; </span></span><strong><span>什么是栈：(x��)栈是�U�程独有的，保存其运行状态和局部自动变量的�?/span></strong><span>栈在�U�程开始的时候初始化�Q�每个线�E�的栈互相独立。每个函数都有自��q��栈，<strong>栈被用来在函��C��间传递参数�?/strong>操作�pȝ��在切换线�E�的时候会(x��)自动的切换栈�Q�就是切�?/span><span>SS/ESP</span><span>寄存器。栈�I�间不需要在高��语言里面昑ּ�的分配和释放�?/span> </p>
<p><span><span>&nbsp;&nbsp;&nbsp; </span></span><span>通过上面�Ҏ(gu��)���늚�描述�Q�可以知道：(x��)</span></p>
<p><span><span>&nbsp;&nbsp;&nbsp; </span></span><strong><span>栈是��q��译器自动分配释放�Q�存攑և�数的参数倹{��局部变量的值等�?/span></strong><span>操作方式�c�M��于数据结构中的栈�?/span></p>
<p><span><span>&nbsp;&nbsp; </span><strong>&nbsp;</strong></span><strong><span>堆一般由�E�序员分配释放，若不释放�Q�程序结束时可能�?/span><span>OS</span></strong><strong><span>回收</span></strong><span>。注意这里说是可能，�q����一定。所以我惛_�������一�ơ，记得要释放！</span></p>
<p><span>所以，举个例子�Q�如果你在函��C��面定义了(ji��n)一个指针变量，然后在这个函数里甌����?ji��n)一块内存让指针指向它。实际上�Q�这个指针的地址是在栈上�Q�但是它所指向的内容却是在堆上面的�Q�这一点要注意�Q�所以，再想惻I��在一个函数里甌����?ji��n)空间后�Q�比如说下面�q�个函数�Q?/span></p>
<p><span>�E�序代码�Q?/span></p>
<p><span><span>&nbsp;&nbsp;&nbsp; </span>// code... </span></p>
<p><span><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>void Function(void) </span></p>
<p><span><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>{ </span></p>
<p><span><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>char *p = (char *)malloc(100 * sizeof(char)); </span></p>
<p><span><span>&nbsp;&nbsp;&nbsp;&nbsp; </span>} </span></p>
<p><span><span>&nbsp;&nbsp;&nbsp; </span></span><span>���p��个例子，千万不要认�ؓ(f��)函数�q�回�Q�函数所在的栈被销毁指针也跟着销毁，甌���的内存�(sh��)����׃��栯���着销毁了(ji��n)�Q�这�l�对是错误的�Q�因�?strong>甌���的内存在堆上�Q�而函数所在的栈被销毁跟堆完全没有啥关系</strong>。所以，�q�是那句话：(x��)记得释放�Q?/span></p>
<p>&nbsp;</p>
<p><strong><span>3</span></strong><strong><span>�?/span><span>free()</span></strong><strong><span>到底释放�?ji��n)什�?/span></strong></p>
<p><span><span>&nbsp;&nbsp;&nbsp; </span><strong>free()</strong></span><strong><span>释放的是指针指向的内�?/span></strong><span>�Q�注意！释放的是内存�Q�不是指针！�q�点非常非常重要�Q?strong>指针是一个变量，只有�E�序�l�束时才被销毁。释放了(ji��n)内存�I�间后，原来指向�q�块�I�间的指针还是存在！</strong>只不�q�现在指针指向的内容的垃圾，是未定义的，所以说是垃圾。因此，前面我已�l�说�q�了(ji��n)�Q�释攑ֆ�存后把指针指�?/span><span>NULL</span><span>�Q�防止指针在后面不小�?j��)又被解引用了(ji��n)。非帔R��要啊�q�一点！</span></p>
<p>&nbsp;</p>
<p><strong><span>三�?/span></strong><strong><span>malloc()</span></strong><strong><span>以及(qi��ng)</span></strong><strong><span>free()</span></strong><strong><span>的机�Ӟ��(x��)</span></strong><strong><span> </span></strong></p>
<p><span><span>&nbsp;&nbsp;&nbsp; </span></span><span>事实上，仔细看一�?/span><span>free()</span><span>的函数原型，也许也会(x��)发现��g��很神奇，</span><span>free()</span><span>函数非常���单，只有一个参敎ͼ�只要把指向申��L(f��ng)��间的指针传�?/span></p>
<p>&nbsp;</p>
<p><span>�l?/span><span>free()</span><span>中的参数���可以完成释攑ַ�作！�q�里要追�t�到</span><span>malloc()</span><span>的申请问题�(sh��)��(ji��n)�?strong>甌���的时候实际上占用的内存要比申��L(f��ng)��大。因�����出的�I�间是用来记录对�q�块内存的管理信息�?/strong></span></p>
<p><span>malloc()</span><span>甌���的空间实际我觉得���是分了(ji��n)两个不同性质的空间�?strong>一个就是用来记录管理信息的�I�间�Q�另外一个就是可用空间了(ji��n)�?/strong>而用来记录管理信息的实际上是一个结构体。在</span><span>C</span><span>语言中，用结构体来记录同一个对象的不同信息�?/span></p>
<p><span>下面看看�q�个�l�构体的原型�Q?/span></p>
<p><span>�E�序代码�Q?/span></p>
<p><span><span>&nbsp;&nbsp;&nbsp; </span>struct mem_control_block { </span></p>
<p><span><span>&nbsp;&nbsp;&nbsp;&nbsp; </span>int is_available;<span>&nbsp;&nbsp;&nbsp;&nbsp; </span>//</span><span>�q�是一个标讎ͼ�</span> </p>
<p><span><span>&nbsp;&nbsp;&nbsp;&nbsp; </span>int size;<span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>//</span><span>�q�是实际�I�间的大��?/span> </p>
<p><span><span>&nbsp;&nbsp;&nbsp;&nbsp; </span>}; </span></p>
<p><span></span></p>
<p><span><span>&nbsp;&nbsp;&nbsp; </span></span><span>对于</span><span>size,</span><span>�q�个是实际空间大���。这里其实我有个疑问�Q?/span><span>is_available</span><span>是否是一个标讎ͼ�因�ؓ(f��)我看�?/span><span>free()</span><span>的源代码之后对这个变量感觉有点纳��P��源代码在下面分析�Q�。这里还请大家指出！</span></p>
<p><span><span>&nbsp;&nbsp;&nbsp; </span></span><span>所以，</span><strong><span>free()</span></strong><strong><span>���是�Ҏ(gu��)���q�个�l�构体的信息来释�?/span><span>malloc()</span></strong><strong><span>甌���的空��_(d��)��</span></strong><span>而结构体的两个成员的大小我想应该是操作系�l�的事了(ji��n)。但是这里有一个问题，</span><span>malloc()</span><span>甌����I�间后返回一个指针应该是指向�W�二�U�空��_(d��)��也就是可用空��_(d��)��不然�Q�如果指向管理信息空间的话，写入的内容和�l�构体的�c�d��有可能不一��_(d��)��或者会(x��)把管理信息屏蔽掉�Q�那���没法释攑ֆ�存空间了(ji��n)�Q�所以会(x��)发生错误�Q�（感觉自己�q�里说的是废话）(j��)</span></p>
<p>&nbsp;</p>
<p><span><span>&nbsp;&nbsp;&nbsp; </span></span><span>好了(ji��n)�Q�下面看�?/span><strong><span>free()</span></strong><strong><span>的源代码</span></strong><span>�Q�我自己分析�?ji��n)一下，觉得比�v</span><span>malloc()</span><span>的源代码倒是�Ҏ(gu��)�����单很多。只是有个疑问，下面指出�Q?/span></p>
<p><span>�E�序代码�Q?/span></p>
<p><span><span>&nbsp;&nbsp;&nbsp; </span>// code... </span></p>
<p><span><span>&nbsp;&nbsp;&nbsp; </span></span></p>
<p><span><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>void free(void *ptr)&nbsp;</span></p>
<p><span><span>&nbsp;&nbsp;&nbsp;&nbsp; </span>{ </span></p>
<p><span><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>struct mem_control_block *free; </span></p>
<p><span><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>free = ptr - sizeof(struct mem_control_block); </span></p>
<p><span><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>free-&gt;is_available = 1; </span></p>
<p><span><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>return; </span></p>
<p><span><span>&nbsp;&nbsp;&nbsp;&nbsp; </span>} </span></p>
<p><span><span>&nbsp;&nbsp;&nbsp; </span></span><span>看一下函数第二句�Q�这句非帔R��要和关键。其实这句就是把指向可用�I�间的指针倒回去，让它指向���理信息的那块空��_(d��)��因�ؓ(f��)�q�里是在��g��减去�?ji��n)一个结构体的大���！后面那一�?/span><span>free-&gt;is_available = 1;</span><span>我有点纳��P��我的��x(ch��ng)��是：(x��)�q�里</span><span>is_available</span><span>应该只是一个标记而已�Q�因��Z���q�个变量的名�U�C��来看�Q?/span><span>is_available </span><span>���译�q�来���是&#8220;是可以用&#8221;。不要说我土�Q�我觉得变量名字可以反映一个变量的作用�Q�特别是严�}的代码。这是源代码�Q�所以我觉得�l�对是严谨的�Q�！�q�个变量的值是</span><span>1</span><span>�Q�表明是可以用的�I�间�Q�只是这里我想了(ji��n)惻I��如果把它改�ؓ(f��)</span><span>0</span><span>或者是其他��g��知道�?x��)发生什么事�Q�！但是有一�Ҏ(gu��)��可以肯定�Q�就是释攄���对不�?x��)那么顺利进行！因��?f��)�q�是一个标讎ͼ�</span></p>
<p>&nbsp;</p>
<p><span><span>&nbsp;&nbsp;&nbsp; </span></span><span>当然�Q�这里可能还是有��Z��(x��)有疑问，��Z��么这样就可以释放呢？�Q�我刚才也有�q�个疑问。后来我惛_���Q�释放是操作�pȝ��的事�Q�那么就</span><span>free()</span><span>�q�个源代码来看，什么也没有释放�Q�对吧？但是它确实是���定�?ji��n)管理信息的那块内存的内宏V��所以，</span><span>free()</span><span>只是记录�?ji��n)一些信息，然后告诉操作�pȝ��那块内存可以去释放，具体怎么告诉操作�pȝ��的我不清楚，但我觉得�q�个已经���出�?ji��n)我�q�篇文章的讨�����围了(ji��n)�?/span></p>
<p>&nbsp;</p>
<p><span><span>&nbsp;&nbsp;&nbsp; </span></span><span>那么�Q�我之前有个错误的认识，���是认�ؓ(f��)指向那块内存的指针不���移到那块内存�(sh��)��的哪个位�|�都可以释放那块内存�Q�但是，�q�是大错牚w���Q�释放是不可以释放一部分的！首先�q�点应该要明白。而且�Q�从</span><span> free()</span><span>的源代码看，</span><span>ptr</span><span>只能指向可用�I�间的首地址�Q�不�?d��ng)���减去�l�构体大���之后一定不是指向管理信息空间的首地址。所以，<strong>要确保指针指向可用空间的首地址�Q?br></strong><span>�E�序代码�Q?br>float *YValuePoint;<br>while ( !feof(file) &amp;&amp; i&lt;DataNumberMax)&nbsp; //��L��<br>&nbsp;&nbsp;{<br>&nbsp;&nbsp;&nbsp;fscanf(file,"%f ",&amp;data);&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <br>&nbsp;&nbsp;&nbsp;YValue[i]=data;<br>&nbsp;&nbsp;&nbsp;sum+=YValue[i];<br>&nbsp;&nbsp;&nbsp;pLineSerie-&gt;AddPoint(XValue++,YValue[i]);<br>&nbsp;&nbsp;&nbsp;i++;<br>&nbsp;&nbsp;}<br>&nbsp; average=sum/DataNumberMax;<br>&nbsp;&nbsp;max=*YValue;<br>&nbsp;&nbsp;min=*(YValue+2);<br><strong>&nbsp;YValuePoint=YValue; //保存首地址</strong><br>&nbsp;&nbsp;for(int j=0;j&lt;DataNumberMax;j++)<br>&nbsp;&nbsp;{<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if(max &lt;* YValue)<br>&nbsp;&nbsp;&nbsp;{<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;max =* YValue;<br>&nbsp;&nbsp;&nbsp;}<br>&nbsp;&nbsp;&nbsp;else<br>&nbsp;&nbsp;&nbsp;{<br>&nbsp;&nbsp;&nbsp;&nbsp;if(min &gt; *YValue) &nbsp;min = *YValue;<br>&nbsp;&nbsp;&nbsp;}<br>&nbsp;&nbsp;&nbsp;YValue++;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; //YValue地址�?1<br>&nbsp;&nbsp;}<br><br><strong>&nbsp;&nbsp;free(YValuePoint);&nbsp; //释放内存�Q�释放从该内存空间的首地址开�?/strong></span></span></p>
<img src ="http://www.shnenglu.com/huxiaofeng/aggbug/102452.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.shnenglu.com/huxiaofeng/" target="_blank">�?/a> 2009-12-03 11:50 <a href="http://www.shnenglu.com/huxiaofeng/archive/2009/12/03/102452.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>钩子</title><link>http://www.shnenglu.com/huxiaofeng/archive/2009/11/28/102174.html</link><dc:creator>�?/dc:creator><author>�?/author><pubDate>Sat, 28 Nov 2009 08:01:00 GMT</pubDate><guid>http://www.shnenglu.com/huxiaofeng/archive/2009/11/28/102174.html</guid><wfw:comment>http://www.shnenglu.com/huxiaofeng/comments/102174.html</wfw:comment><comments>http://www.shnenglu.com/huxiaofeng/archive/2009/11/28/102174.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.shnenglu.com/huxiaofeng/comments/commentRss/102174.html</wfw:commentRss><trackback:ping>http://www.shnenglu.com/huxiaofeng/services/trackbacks/102174.html</trackback:ping><description><![CDATA[&nbsp;&nbsp;&nbsp;&nbsp; 摘要: HHOOK SetWindowsHookEx(&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; &nbsp;//装蝲一�?..&nbsp;&nbsp;<a href='http://www.shnenglu.com/huxiaofeng/archive/2009/11/28/102174.html'>阅读全文</a><img src ="http://www.shnenglu.com/huxiaofeng/aggbug/102174.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.shnenglu.com/huxiaofeng/" target="_blank">�?/a> 2009-11-28 16:01 <a href="http://www.shnenglu.com/huxiaofeng/archive/2009/11/28/102174.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>指针的指�?/title><link>http://www.shnenglu.com/huxiaofeng/archive/2009/11/22/101654.html</link><dc:creator>�?/dc:creator><author>�?/author><pubDate>Sun, 22 Nov 2009 14:31:00 GMT</pubDate><guid>http://www.shnenglu.com/huxiaofeng/archive/2009/11/22/101654.html</guid><wfw:comment>http://www.shnenglu.com/huxiaofeng/comments/101654.html</wfw:comment><comments>http://www.shnenglu.com/huxiaofeng/archive/2009/11/22/101654.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.shnenglu.com/huxiaofeng/comments/commentRss/101654.html</wfw:commentRss><trackback:ping>http://www.shnenglu.com/huxiaofeng/services/trackbacks/101654.html</trackback:ping><description><![CDATA[指向另一指针的指针：(x��)转自<strong><font size=4>风过无痕博客</font></strong><span id="ldonfkl"    class=addtime>
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<p><strong>一�Q?回顾指针概念�Q?/strong><br>早在本系列第二篇中我���对指针的实质进行了(ji��n)阐述。今天我们又�?a onclick="javascript:tagshow(event, '%D1%A7%CF%B0');" href="javascript:;" target=_self><u><strong><font color=#009999>学习(f��n)</font></strong></u></a>一个叫做指向另一指针地址的指针。让我们先回��一下指针的概念吧！<br>当我们程序如下申明变量：(x��)<br>short int i;<br>char a;<br>short int * pi;<br>�E�序�?x��)在内存某地址�I�间上�ؓ(f��)各变量开辟空��_(d��)��如下图所�C��?br>内存地址&#8594;6&nbsp;&nbsp;&nbsp;&nbsp; 7&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;8&nbsp;&nbsp;&nbsp;&nbsp; 9&nbsp;&nbsp;&nbsp;&nbsp; 10&nbsp;&nbsp;&nbsp;&nbsp; 11&nbsp;&nbsp;&nbsp;&nbsp;12&nbsp;&nbsp;&nbsp;&nbsp;13&nbsp;&nbsp;&nbsp;&nbsp; 14&nbsp;&nbsp;&nbsp;&nbsp;15<br>-------------------------------------------------------------------------------------<br>&#8230;&nbsp;&nbsp;|&nbsp;&nbsp;&nbsp;&nbsp; |&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; |&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|&nbsp;&nbsp;<br>-------------------------------------------------------------------------------------<br>&nbsp;&nbsp;&nbsp;&nbsp;|short int i |char a|&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|short int * pi|<br>图中所�C�Z��可看出：(x��)<br>i 变量在内存地址5的位�|�，占两个字节�?br>a变量在内存地址7的位�|�，占一个字节�?br>pi变量在内存地址9的位�|�，占两个字节�?注：(x��)pi 是指针，我这里指针的宽度只有两个字节�Q?2位系�l�是四个字节)<br>接下来如下赋�?<br>i=50;<br>pi=&amp;i;<br>�l�过上在两句的赋��|��变量的内存映象如�?<br>内存地址&#8594;6&nbsp;&nbsp;&nbsp;&nbsp; 7&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;8&nbsp;&nbsp;&nbsp;&nbsp; 9&nbsp;&nbsp;&nbsp;&nbsp; 10&nbsp;&nbsp;&nbsp;&nbsp; 11&nbsp;&nbsp;&nbsp;&nbsp;12&nbsp;&nbsp;&nbsp;&nbsp;13&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;14&nbsp;&nbsp;&nbsp;&nbsp; 15<br>--------------------------------------------------------------------------------------<br>&#8230;&nbsp;&nbsp;|&nbsp;&nbsp;&nbsp;&nbsp;50&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|&nbsp;&nbsp;&nbsp;&nbsp;6&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; |&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; |&nbsp;&nbsp;<br>--------------------------------------------------------------------------------------<br>&nbsp;&nbsp;&nbsp;&nbsp;|short int i |char a|&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|short int * pi|<br>看到没有�Q�短整型指针变量pi的��gؓ(f��)6�Q�它?y��u)��是I变量的内存�v始地址。所以，�q�时当我们对*pi�q�行��d��操作�Ӟ��其实���是对i变量的读写操作。如�Q?br>*pi=5;&nbsp;&nbsp; //���是�{��h(hu��n)于I=5;<br><br><strong>二． 指针的地址与指向另一指针地址的指�?/strong><br>在上一节中�Q�我们看刎ͼ�指针变量本��n�?a onclick="javascript:tagshow(event, '%C6%E4%CB%FC');" href="javascript:;" target=_self><u><strong><font color=#009999>其它</font></strong></u></a>变量一样也是在某个内存地址中的�Q�如pi的内存�v始地址�?0。同��L(f��ng)���Q�我们也可能让某个指针指向这个地址�?br>看下面代码：(x��)<br>short int * * ppi;&nbsp;&nbsp;&nbsp;&nbsp;//�q�是一个指向指针的指针�Q�注意有两个*�?br>ppi=pi<br>�W�一句：(x��)short int * * ppi;——申明了(ji��n)一个指针变量ppi�Q�这个ppi是用来存储（或称指向�Q�一个short int * �c�d��指针变量的地址�?br>�W�二句：(x��)&amp;pi那就是取pi的地址�Q�ppi=pi���是把pi的地址赋给�?ji��n)ppi。即���地址�?0赋值给ppi。如下图�Q?br>内存地址&#8594;6&nbsp;&nbsp;&nbsp;&nbsp; 7&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;8&nbsp;&nbsp;&nbsp;&nbsp; 9&nbsp;&nbsp;&nbsp;&nbsp; 10&nbsp;&nbsp;&nbsp;&nbsp; 11&nbsp;&nbsp;&nbsp;&nbsp;12&nbsp;&nbsp;&nbsp;&nbsp;13&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 14&nbsp;&nbsp;&nbsp;&nbsp;15<br>------------------------------------------------------------------------------------<br>&#8230;&nbsp;&nbsp;|&nbsp;&nbsp;&nbsp;&nbsp;50&nbsp;&nbsp;&nbsp;&nbsp; |&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;6&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; |&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 10&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|&nbsp;&nbsp;<br>------------------------------------------------------------------------------------<br>&nbsp;&nbsp;&nbsp;&nbsp;|short int i|char a|&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|short int * pi|short int ** ppi|<br>从图中看出，指针变量ppi的内容就是指针变量pi的�v始地址。于�?#8230;&#8230;<br>ppi的值是多少呢？—�?0�?br>*ppi的值是多少呢？—�?,即pi的倹{�?br>**ppi的值是多少呢？—�?0,即I的��|��也是*pi的倹{�?br>呵呵�Q�不用我说太多了(ji��n)�Q�我�怿�你应明白�q�种指针�?ji��n)吧�Q?br><br><strong>三． 一个应用实�?/strong><br>1�Q?设计一个函敎ͼ�(x��)void find1(char array[], char search, char * pi)<br><strong>要求�Q?/strong>�q�个函数参数中的数组array是以0��gؓ(f��)�l�束的字�W�串�Q�要求在字符串array中查扑֭��W�是参数search里的字符。如果找刎ͼ�函数通过�W�三个参敎ͼ�pa�Q�返回��gؓ(f��)array字符串中�W�一个找到的字符的地址。如果没扑ֈ��Q�则为pa�?�?br><strong>设计�Q?/strong>依题意，实现代码如下�?br>void find1(char array[] , char search, char * pa)<br>{<br>&nbsp;&nbsp; int i;<br>&nbsp;&nbsp; for (i=0;*(array+i)!=0;i++)<br>&nbsp;&nbsp; {<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if (*(array+i)==search)<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;pa=array+i<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;break;<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;else if (*(array+i)==0)<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;pa=0;<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;break;<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}<br>&nbsp;&nbsp; }<br>}<br>你觉得这个函数能实现所要求的功能吗�Q?br><strong>调试�Q?/strong><br>我下面调用这个函数试试�?br>void main()<br>{<br>&nbsp;&nbsp;char str[]={&#8220;afsdfsdfdf\0&#8221;};&nbsp;&nbsp;//待查扄���字符�?br>&nbsp;&nbsp;char a=&#8217;d&#8217;;&nbsp;&nbsp; //讄���要查扄���字符<br>&nbsp;&nbsp;char * p=0;&nbsp;&nbsp;//如果查找到后指针p���指向字�W�串中查扑ֈ�的第一个字�W�的地址�?br>&nbsp;&nbsp;find1(str,a,p);&nbsp;&nbsp;//调用函数以实现所要操作�?br>&nbsp;&nbsp;if (0==p )<br>&nbsp;&nbsp;{<br>&nbsp;&nbsp;&nbsp;&nbsp; printf (&#8220;没找刎ͼ�\n&#8221;);//1.如果没找到则输出此句<br>&nbsp;&nbsp;}<br>&nbsp;&nbsp;else<br>&nbsp;&nbsp;{<br>&nbsp;&nbsp;&nbsp;&nbsp; printf(&#8220;扑ֈ��?ji��n)，p=%d&#8221;,p);&nbsp;&nbsp;//如果扑ֈ�则输出此�?br>&nbsp;&nbsp;}<br>}<br><strong>分析�Q?/strong><br>上面代码�Q�你认�ؓ(f��)�?x��)是输出什么呢�Q?br>�q�行试试�?br>唉！怎么输出的是�Q�没有找刎ͼ�<br>而不是：(x��)扑ֈ��?ji��n)�?#8230;&#8230;�?br>明明a��gؓ(f��)&#8217;d&#8217;�Q�而str字符串的�W�四个字�W�是&#8217;d&#8217;�Q�应该找得到呀�Q?br>再看函数定义处：(x��)void find1(char array[] , char search, char * pa)<br>看调用处�Q�find1(str,a,p);<br>依我在第五篇的分析方法，函数调用时会(x��)�Ҏ(gu��)��一个参数进行一个隐含的赋值操作�?br>整个调用如下�Q?br>&nbsp;&nbsp; array=str;<br>&nbsp;&nbsp; search=a;<br>&nbsp;&nbsp; pa=p;&nbsp;&nbsp;&nbsp;&nbsp;//��h��意：(x��)以上三句是调用时隐含的动作�?br>&nbsp;&nbsp; int i;<br>&nbsp;&nbsp; for (i=0;*(array+i)!=0;i++)<br>&nbsp;&nbsp; {<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if (*(array+i)==search)<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;pa=array+i<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;break;<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;else if (*(array+i)==0)<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;pa=0;<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;break;<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}<br>&nbsp;&nbsp; }<br>哦！参数pa与参数search的传递�ƈ没有什么不同，都是��g��递嘛�Q�小语：(x��)地址传递其实就是地址��g��递嘛�Q�！所以对形参变量pa��|��当然值是一个地址��|��(j��)的修改�ƈ不会(x��)改变实参变量p��|��因此p的值�ƈ没有改变(即p的指向�ƈ没有被改�?�?br>�Q�如果还有疑问，再看一看《函数参数的传递》了(ji��n)。）(j��)<br><strong>修正�Q?/strong><br>void find2(char [] array, char search, char ** ppa)<br>{<br>&nbsp;&nbsp; int i;<br>&nbsp;&nbsp; for (i=0;*(array+i)!=0;i++)<br>&nbsp;&nbsp; {<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if (*(array+i)==search)<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*ppa=array+i<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;break;<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;else if (*(array+i)==0)<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*ppa=0;<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;break;<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}<br>&nbsp;&nbsp; }<br>}<br>��d��数的调用处改如下�Q?br>&nbsp;&nbsp;find2(str,a,&amp;p);&nbsp;&nbsp;//调用函数以实现所要操作�?br><strong>再分析：(x��)</strong><br>�q�样调用函数时的整个操作变成如下�Q?br>&nbsp;&nbsp; array=str;<br>&nbsp;&nbsp; search=a;<br>&nbsp;&nbsp; ppa=&amp;p;&nbsp;&nbsp;&nbsp;&nbsp;//��h��意：(x��)以上三句是调用时隐含的动作�?br>&nbsp;&nbsp; int i;<br>&nbsp;&nbsp; for (i=0;*(array+i)!=0;i++)<br>&nbsp;&nbsp; {<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if (*(array+i)==search)<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*ppa=array+i<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;break;<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;else if (*(array+i)==0)<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*ppa=0;<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;break;<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}<br>&nbsp;&nbsp; }<br>看明白了(ji��n)吗？<br>ppa指向指针p的地址�?br>�?ppa的修改就是对p值的修改�?br>下面看一下指向指针变量的指针变量怎样正确引用�?br>用指向指针的指针变量讉K��一�l�和二维数组�?/p>
<p>#include&lt;stdio.h&gt;<br>#include&lt;stdlib.h&gt;<br>main()<br>{<br>int a[3],b[2][2],*p1,*p2,**p3,i,j;</p>
<p>printf("误���入一�l�数�l�的�?\n");<br>for(i=0;i&lt;3;i++)<br>scanf("%d",&amp;a[i]);/*一�l�数�l�的输入*/</p>
<p>printf("误���入二�l�数�l�的�?\n");<br>for(i=0;i&lt;2;i++)<br>for(j=0;j&lt;2;j++)<br>scanf("%d",&amp;b[i][j]);/*二维数组输入*/</p>
<p>printf("用指针输��Z���l�数�l?\n");<br>for(p1=a,i=0;i&lt;3;i++)&nbsp;&nbsp;&nbsp;&nbsp; /* 用指针输��Z���l�数�l?/<br>{<br>&nbsp;&nbsp;&nbsp; printf("%4d",*(p1+i));<br>}<br>printf("\n");</p>
<p>printf("用指向指针的指针变量输出一�l�数�l?1):\n");<br>for(p1=a,p3=&amp;p1,i=0;i&lt;3;i++)<br>printf("%4d",*(*p3+i));/*用指向指针的指针变量输出一�l�数�l?/<br>printf("\n");<br>printf("用指向指针的指针变量输出一�l�数�l?2):\n");<br>for(p1=a;p1-a&lt;3;p1++)/*用指向指针的指针变量输出一�l�数�l?/<br>{<br>p3=&amp;p1;<br>printf("%4d",**p3);<br>}<br>printf("\n");</p>
<p>printf("用指针输��Z���l�数�l?\n");<br>for(i=0;i&lt;2;i++)&nbsp;&nbsp; /*用指针输��Z���l�数�l?/<br>{<br>&nbsp;&nbsp; p2=b[i] ;<br>&nbsp;&nbsp; for(int j=0;j&lt;2;j++)<br>&nbsp; {<br>&nbsp;&nbsp;&nbsp; printf("%4d",*(p2+j)) ;<br>&nbsp; }<br>}<br>printf("\n");</p>
<p>printf("用指向指针的指针变量输出二维数组(1):\n");<br>for(i=0;i&lt;2;i++)/*用指向指针的指针变量输出二维数组*/<br>{<br>p2=b[i];<br>p3=&amp;p2;<br>for(j=0;j&lt;2;j++)<br>printf("%4d",*(*p3+j));</p>
<p>利用指向指针的指针变量对二维字符数组的访问�?/p>
<p>#include&lt;stdio.h&gt;<br>#include&lt;stdlib.h&gt;<br>main()<br>{<br>int i;<br>char * ptr;<br>static char c[][16]={"clanguage","fox","computer","homepage"};<br>/*二维字符数组*/<br>static char *cp[]={c[0],c[1],c[2],c[3]};/*指针数组*/<br>static char **cpp;/*指向字符指针的指针变�?/<br>cpp=cp;/*���指针数�l�的首地址传递给指向字符指针的指针变�?/</p>
<p><br>for(i=0;i&lt;4;i++)/*按行输出字符�?/<br>printf("%s\n",*cpp++);<br>printf("-----------\n");</p>
<p>for(i=0;i&lt;4;i++)/*按行输出字符�?/<br>{<br>cpp=&amp;cp[i];<br>printf("%s\n",*cpp);<br>}<br>printf("-----------\n");</p>
<p>&nbsp;<br>&nbsp;for(i=0;i&lt;4;i++)<br>&nbsp;{<br>&nbsp;&nbsp;&nbsp; ptr=c[i];<br>&nbsp;&nbsp;&nbsp; printf("%s",ptr);<br>&nbsp;&nbsp;&nbsp; printf("\n");<br>&nbsp;}<br>&nbsp;</p>
<p>}</p>
<p>}<br>printf("\n");</p>
<p>&nbsp;printf("用指向指针的指针变量输出二维数组(2):\n");<br>for(i=0;i&lt;2;i++)/*用指向指针的指针变量输出二维数组*/<br>{<br>p2=b[i];<br>for(p2=b[i];p2-b[i]&lt;2;p2++)<br>{<br>p3=&amp;p2;<br>printf("%4d",**p3);<br>}<br>printf("\n");<br>}</p>
<p>}<br></p>
</div>
</span>
<img src ="http://www.shnenglu.com/huxiaofeng/aggbug/101654.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.shnenglu.com/huxiaofeng/" target="_blank">�?/a> 2009-11-22 22:31 <a href="http://www.shnenglu.com/huxiaofeng/archive/2009/11/22/101654.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>C++中的接口与实�?/title><link>http://www.shnenglu.com/huxiaofeng/archive/2009/11/21/101577.html</link><dc:creator>�?/dc:creator><author>�?/author><pubDate>Sat, 21 Nov 2009 12:20:00 GMT</pubDate><guid>http://www.shnenglu.com/huxiaofeng/archive/2009/11/21/101577.html</guid><wfw:comment>http://www.shnenglu.com/huxiaofeng/comments/101577.html</wfw:comment><comments>http://www.shnenglu.com/huxiaofeng/archive/2009/11/21/101577.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.shnenglu.com/huxiaofeng/comments/commentRss/101577.html</wfw:commentRss><trackback:ping>http://www.shnenglu.com/huxiaofeng/services/trackbacks/101577.html</trackback:ping><description><![CDATA[&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 所谓接口��承，���是�z�����c�d���l�承函数的接口，也就是声明；而实现��承，���是�z�����c�d��时��承函数的接口和实现�?br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 我们都很清楚C++中有几个基本的概念，虚函数、纯虚函数、非虚函数�?br><strong>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 虚函�?/strong>�Q?br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; C++实现�q�行中的<strong>多态�?/strong>是通过虚函数实现的�Q�而虚函数必须存在于��承环境下�?br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 因此�Q�虚函数是指一个类中你希望�q�行重蝲的成员函敎ͼ�当你用一个基�c�L��针或引用指向一个��承类对象的时候，你调用一个虚函数�Q�实际调用的是��承类的成员函数。虚函数用来表现基类和派生类的成员函��C��间的一�U�关�p�R��虚函数的定义在基类中进行，在需要定义�ؓ(f��)虚函数的成员函数的声明前冠以关键字，�?<strong>virtual void func()</strong>&nbsp;�?基类中的某个成员函数被声明�ؓ(f��)虚函数后,此虚函数���可以在一个或多个�z�����c�M��被重新定�? 在派生类中重新定义时�Q�其函数原型,包括�q�回�c�d��、函数名、参��C��数、参数类型及(qi��ng)参数的先后顺序，都必���M��基类中的原型完全相同�?br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 虚函数是<strong>重蝲</strong>的一�U�表现�Ş式，是一�U�动态的重蝲方式�?br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 只有�cȝ��普通成员函数可以定义�ؓ(f��)虚函敎ͼ�全局函数�?qi��ng)�?r��n)态成员函敎ͼ��c�L��有）(j��)不能声明�����函数�?br><strong>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; �U�虚函数�Q?/strong><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;�U�虚函数在基�c�M��没有定义且只能在基类中定义，但未�l�出具体的函数定义体�Q?strong>实现</strong>�Q�，它们被初始化�?。�Q何用�U�虚函数�z����的类�Q�都要自己提供该函数的具体实现�?br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 定义�U�虚函数�Q?strong>virtual void func() = 0;<br></strong>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 定义�?ji��n)纯虚函数的�c�被�U�C���?strong>抽象�c?/strong>。抽象类定义一族派生类的共�?strong>接口</strong>�Q�而接口的完整<strong>实现</strong>�Q�即�U�虚函数的函��C���Q�由�z�����c�自己定义�?br>例：(x��)//class Shape<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; public:<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; virtual void area()=0�Q?nbsp;//&nbsp;�U�虚函数<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; //class Tringle : public Shape&nbsp; //公有�l�承<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; public:<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; void area() {//}&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; /接口与实�?br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;抽象�c�d��以有多个�U�虚函数�Q�也可以定义其他虚函数。若�z�����c�L��有重新定义纯虚函敎ͼ�那么该派生类也称之�ؓ(f��)�U�虚函数�?br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;�U�虚函不需要定义其实际操作�Q�它的存在只是�ؓ(f��)�?ji��n)在�z�����c�M��被重新定义，只是提供一�?strong>多态接�?/strong>�?br><strong>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 非虚函数</strong>�Q?br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 一般成员函敎ͼ�无virtual关键字修饰�?br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;至于��Z��么要定义�q�些函数�Q�我们可以将虚函数、纯虚函数和非虚函数的功能与<strong>接口�l�承</strong>�?strong>实现�l�承</strong>联系��h���Q?br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 如前所�q�ͼ�声明一个纯虚函敎ͼ�pure virtual�Q�的目的是�ؓ(f��)�?ji��n)让�z�����c�d���l�承函数接口�Q�也���是上面说的接口�l�承�?br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; �U�虚函数一般是在不方便具体实现此函数的情况下��用。也���是说基�c�L��法�ؓ(f��)�l�承�c�规定一个统一的缺省操作，但��承类又必���d��有这个函数接口，�q�对其分别实现。但是，在C++中，我们是可以�ؓ(f��)�U�虚函数提供定义的，只不�q�这�U�定义对�l�承�c�L��说没有特定的意义。因为��承类仍然要根据各自需要实现函数�?br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 通俗��_(d��)���U�虚函数���是要求其��承类必须含有该函数接口，�q�对其进行实现。是对��承类的一�U�接口实现要求，但�ƈ不提供缺省操作，各个�l�承�c�d�����d��别实现自��q��操作�?br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 声明非纯虚函敎ͼ�impure virtual�Q�的目的是让�l�承�cȝ��承该函数的接口和�~�省实现�?br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 与纯虚函数唯一的不同就是其为��承类提供�?ji��n)缺省操作，�l�承�c�d��以不实现自己的操作而采用基�c�L��供的默认操作�?br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;声明非虚函数�Q�non-virtual�Q�的目的是�ؓ(f��)�?ji��n)��o(h��)�l�承�cȝ��承函数接口及(qi��ng)一份强制性实现�?br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 相对于虚函数来说�Q�非虚函数对�l�承�c�要求的更�ؓ(f��)严格�Q���承类不仅要��承函数接口，而且也要�l�承函数实现。也���是为��承类定义�?ji��n)一�U�行为�?br><strong>&nbsp;�ȝ��</strong>�Q?br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; �U�虚函数�Q�要求��承类必须含有某个接口�Q��ƈ�Ҏ(gu��)��口函数实现�?br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 虚函敎ͼ�(x��)�l�承�c�d�����d��有某个接口，可以自己实现�Q�也可以不实玎ͼ�而采用基�c�d��义的�~�省实现�?br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 非虚函数�Q���承类必须含有某个接口�Q�必���M��用基�cȝ��实现�?br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;一个C++�c�L��着两个重要的方面：(x��)用于描述行�ؓ(f��)的公共接口，以及(qi��ng)行�ؓ(f��)的私有实现�?br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 大多数的�l�承都是公有�l�承�Q�派生类�l�承�?ji��n)基�cȝ��接口和实现。不�q�，我们也可以进行有选择的��承，��x(ch��ng)��生类可以只��承接口或实现。私有基�c�，只��承实实现�Q�没有接口；公有�l�承基类�Q���承接口，但��承的实现可能是不完整的或不存在的�Q�纯虚函敎ͼ�(j��)�?br>&nbsp;例：(x��)<br>我们可以用函敎ͼ�(x��)<br>&nbsp;Triangle t;<br>&nbsp;t.area();<br>我们只是使用�?ji��n)其接口�Q�但具体的实现可以不知道。void area() {......} <br><br>
<img src ="http://www.shnenglu.com/huxiaofeng/aggbug/101577.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.shnenglu.com/huxiaofeng/" target="_blank">�?/a> 2009-11-21 20:20 <a href="http://www.shnenglu.com/huxiaofeng/archive/2009/11/21/101577.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>�l�承����?/title><link>http://www.shnenglu.com/huxiaofeng/archive/2009/11/21/101545.html</link><dc:creator>�?/dc:creator><author>�?/author><pubDate>Sat, 21 Nov 2009 02:58:00 GMT</pubDate><guid>http://www.shnenglu.com/huxiaofeng/archive/2009/11/21/101545.html</guid><wfw:comment>http://www.shnenglu.com/huxiaofeng/comments/101545.html</wfw:comment><comments>http://www.shnenglu.com/huxiaofeng/archive/2009/11/21/101545.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.shnenglu.com/huxiaofeng/comments/commentRss/101545.html</wfw:commentRss><trackback:ping>http://www.shnenglu.com/huxiaofeng/services/trackbacks/101545.html</trackback:ping><description><![CDATA[<p align=left>&nbsp;&nbsp;&nbsp; 通过�l�承机制�Q�可以利用已有的数据�c�d��来定义新的数据类型。所定义的新的数据类型不仅拥有新定义的成员，而且�q�同时拥有旧的成员。我们称已存在的用来�z����新类的类为基�c�，又称为父�c�R��由已存在的�c�L��生出的新�cȝ��为派生类�Q�又�U�Cؓ(f��)子类�?br>&nbsp;&nbsp;&nbsp; 在C++语言中，一个派生类可以从一个基�c�L��生，也可以从多个基类�z����。从一个基�c�L��生的�l�承�U�Cؓ(f��)单��承；从多个基�c�L��生的�l�承�U�Cؓ(f��)多���ѝ�?br>例：(x��)</p>
<p>#include &lt;iostream.h&gt;<br>class Metal<br>{<br>public:<br>&nbsp;unsigned atomicNumber;<br>&nbsp;float atomicWeight;<br>&nbsp;float pricePerounce;<br>public:<br>&nbsp;Metal(&nbsp;unsigned Number=0,<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; float Weight=0.000000,<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; float Perounce=0.000000)<br>&nbsp;{<br>&nbsp;atomicNumber=Number;<br>&nbsp;atomicWeight=Weight;<br>&nbsp;pricePerounce=Perounce;<br>&nbsp;}<br>&nbsp;~Metal() {}<br>&nbsp;&nbsp;&nbsp; unsigned GetNumber(void) {return atomicNumber;}&nbsp; //内联函数<br>&nbsp;&nbsp;&nbsp; float GetWeight(void) {return atomicWeight;}<br>&nbsp;&nbsp;&nbsp; float Getprice(void) {return pricePerounce;}<br>&nbsp;virtual void output()<br>&nbsp;{<br>&nbsp;&nbsp;cout &lt;&lt; "The atomic weight =" &lt;&lt; atomicWeight &lt;&lt; endl;<br>&nbsp;&nbsp;cout &lt;&lt; "The atomic number =" &lt;&lt; atomicNumber &lt;&lt; endl;<br>&nbsp;&nbsp;cout &lt;&lt; "Price per ounce =" &lt;&lt; pricePerounce &lt;&lt; endl;<br>&nbsp;}<br>};</p>
<p>class Pb : public Metal&nbsp; //公有�l�承�Q�单�l�承<br>{<br>public:<br>&nbsp;Pb (unsigned Number=82,float Weight=207,float Perounce=0.01):Metal(Number,Weight,Perounce) {}<br>&nbsp;//子类构造首先调用基�c�L��造函�?br>};</p>
<p>class Au : public Metal<br>{<br>public:<br>&nbsp;Au (unsigned Number=79,float Weight=196.9665,float Perounce=450.75):Metal(Number,Weight,Perounce) {}<br>&nbsp;Au (Pb&amp; lemp)&nbsp; //拯���函数<br>&nbsp;{<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; atomicNumber=lemp.GetNumber()-3;<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; atomicWeight=lemp.GetWeight()-10.2335;<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; pricePerounce=lemp.Getprice()+450.74;<br>&nbsp;}<br>};</p>
<p>void main ()<br>{<br>&nbsp;&nbsp;&nbsp; Pb m;<br>&nbsp;Au n=m;&nbsp;&nbsp;&nbsp;&nbsp; //拯���<br>&nbsp;n.output();<br>}</p>
注：(x��)
<p align=left>　　�z�����cȝ��三种�l�承方式�Q�公有���?public)、私有���?private)、保护���?protected)是常用的三种�l�承方式�Q?br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 公有�l�承�Ӟ��水��^讉K��和垂直访问对基类中的公有成员?sh��)��受限制�Q?br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;�U�有�l�承�Ӟ��水��^讉K��和垂直访问对基类中的公有成员?sh��)��不能访问�?br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 保护�l�承�Ӟ��对于垂直讉K��同于公有�l�承�Q�对于水�q����问同于私有���ѝ�?br><o:p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 对于基类中的�U�有成员�Q�只能被基类中的成员函数和友元函数所讉K���Q�不能被其他的函数访问�?br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp; 如果通过公有�l�承来��生基�c�，那么�q�个�z�����c�d��该是其基�cȝ��特化�?br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 如果�z�����c�M��间的区别在于属性，则用数据成员来表�C�；如果在于行�ؓ(f��)�Q�则用虚函数来表�C��?br><br><span style="FONT-SIZE: 14pt; COLOR: black; FONT-FAMILY: �?hu��)�? LETTER-SPACING: 0.25pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">&nbsp;&nbsp;&nbsp;��M��一个类都可以派生出一个新�c�，�z�����c�M��可以再派生出新类�?/span></o:p></p>
<p align=left>&nbsp;</p>
<img src ="http://www.shnenglu.com/huxiaofeng/aggbug/101545.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.shnenglu.com/huxiaofeng/" target="_blank">�?/a> 2009-11-21 10:58 <a href="http://www.shnenglu.com/huxiaofeng/archive/2009/11/21/101545.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>如何讄���按钮控�g点击弹出新菜单栏</title><link>http://www.shnenglu.com/huxiaofeng/archive/2009/11/19/101379.html</link><dc:creator>�?/dc:creator><author>�?/author><pubDate>Thu, 19 Nov 2009 06:03:00 GMT</pubDate><guid>http://www.shnenglu.com/huxiaofeng/archive/2009/11/19/101379.html</guid><wfw:comment>http://www.shnenglu.com/huxiaofeng/comments/101379.html</wfw:comment><comments>http://www.shnenglu.com/huxiaofeng/archive/2009/11/19/101379.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.shnenglu.com/huxiaofeng/comments/commentRss/101379.html</wfw:commentRss><trackback:ping>http://www.shnenglu.com/huxiaofeng/services/trackbacks/101379.html</trackback:ping><description><![CDATA[<p>函数介绍�Q�CButtonST应用<br><strong>DWORD CButtonST::SetMenu(UINT nMenu, HWND hParentWnd, BOOL bRepaint)<br>{<br>&nbsp;</strong>HINSTANCE&nbsp;hInstResource&nbsp;= NULL;</p>
<p>&nbsp;// Destroy any previous menu<br>&nbsp;if (m_hMenu)<br>&nbsp;{<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;::DestroyMenu(m_hMenu);<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; m_hMenu = NULL;<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;m_hParentWndMenu = NULL;<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;m_bMenuDisplayed = FALSE;<br>&nbsp;} // if</p>
<p>&nbsp;// Load menu<br>&nbsp;if (nMenu)<br>&nbsp;{<br>&nbsp;&nbsp;// Find correct resource handle<br>&nbsp;&nbsp;hInstResource = AfxFindResourceHandle(MAKEINTRESOURCE(nMenu), RT_MENU);<br>&nbsp;&nbsp;// Load menu resource<br>&nbsp;&nbsp;m_hMenu = ::LoadMenu(hInstResource, MAKEINTRESOURCE(nMenu));<br>&nbsp;&nbsp;m_hParentWndMenu = hParentWnd;<br>&nbsp;&nbsp;// If something wrong<br>&nbsp;&nbsp;if (m_hMenu == NULL) return BTNST_INVALIDRESOURCE;<br>&nbsp;} // if</p>
<p>&nbsp;// Repaint the button<br>&nbsp;&nbsp;&nbsp;&nbsp; if (bRepaint)&nbsp; Invalidate();</p>
<p>&nbsp;&nbsp;&nbsp;&nbsp; return BTNST_OK;<br>} // End of SetMenu</p>
<p><strong>DWORD CButtonST::SetMenu(UINT nMenu, HWND hParentWnd, BOOL bWinXPStyle, UINT nToolbarID, CSize sizeToolbarIcon, COLORREF crToolbarBk, BOOL bRepaint)&nbsp;&nbsp;&nbsp; </strong>//除前两个参数�Q�其他参数都有初始�?br>{<br>&nbsp;BOOL&nbsp;bRetValue = FALSE;</p>
<p>&nbsp;// Destroy any previous menu<br>&nbsp;if (m_menuPopup.m_hMenu)<br>&nbsp;{<br>&nbsp;&nbsp; &nbsp;m_menuPopup.DestroyMenu();<br>&nbsp;&nbsp;&nbsp; m_hParentWndMenu = NULL;<br>&nbsp;&nbsp;&nbsp; m_bMenuDisplayed = FALSE;<br>&nbsp;} // if</p>
<p>&nbsp;// Load menu<br>&nbsp;if (nMenu)<br>&nbsp;{<br>&nbsp;&nbsp;&nbsp;&nbsp; m_menuPopup.SetMenuDrawMode(bWinXPStyle);<br>&nbsp;&nbsp;// Load menu<br>&nbsp;&nbsp;&nbsp;&nbsp; bRetValue = m_menuPopup.LoadMenu(nMenu);<br>&nbsp;&nbsp;// If something wrong<br>&nbsp;&nbsp;if (bRetValue == FALSE) return BTNST_INVALIDRESOURCE;</p>
<p>&nbsp;&nbsp;// Load toolbar<br>&nbsp;&nbsp;if (nToolbarID)<br>&nbsp;&nbsp;{<br>&nbsp;&nbsp;&nbsp;m_menuPopup.SetBitmapBackground(crToolbarBk);<br>&nbsp;&nbsp;&nbsp;m_menuPopup.SetIconSize(sizeToolbarIcon.cx, sizeToolbarIcon.cy);</p>
<p>&nbsp;&nbsp;&nbsp;bRetValue = m_menuPopup.LoadToolbar(nToolbarID);<br>&nbsp;&nbsp;&nbsp;// If something wrong<br>&nbsp;&nbsp;&nbsp;if (bRetValue == FALSE) <br>&nbsp;&nbsp;&nbsp;{<br>&nbsp;&nbsp;&nbsp;&nbsp;m_menuPopup.DestroyMenu();<br>&nbsp;&nbsp;&nbsp;&nbsp;return BTNST_INVALIDRESOURCE;<br>&nbsp;&nbsp;&nbsp;} // if<br>&nbsp;&nbsp;} // if</p>
<p>&nbsp;&nbsp;m_hParentWndMenu = hParentWnd;<br>&nbsp;} // if</p>
<p>&nbsp;// Repaint the button<br>&nbsp;if (bRepaint) Invalidate();</p>
<p>&nbsp;return BTNST_OK;<br>} // End of SetMenu</p>
通过<strong>#ifdef&nbsp;BTNST_USE_BCMENU&nbsp; </strong>来判断选择哪个函数�?br><br>�E�序�q�程�Q?br>&nbsp;&nbsp; 头文�Ӟ��(x��)<br>CButtonST m_btnHelp;<br>&nbsp;&nbsp; 源文�Ӟ��(x��)<br>1�Q�在当前对话�cȝ��初始化函��C����d���Q?br><strong>OnInitDialog()</strong><br>&nbsp;m_btnHelp.SetIcon(IDI_HELP, (int)BTNST_AUTO_GRAY);&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; //讄���图标�Q�未点击时变�?br>&nbsp;m_btnHelp.SetTooltipText(_T("Help"));&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; //输出文字<br>#ifdef&nbsp;BTNST_USE_BCMENU<br>&nbsp;m_btnHelp.SetMenu(IDR_MENU, m_hWnd);&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp; //点击时弹�?gu��)���单�?br>#else<br>&nbsp;m_btnHelp.SetMenu(IDR_MENU, m_hWnd);<br>#endif<br>2�Q�设�|�控件交换信息：(x��)<br><strong>DoDataExchange(CDataExchange* pDX)</strong>函数�?br>&nbsp;DDX_Control(pDX,IDC_BUTTON1,m_btnHelp);&nbsp; //输出<br>3�Q�新菜单栏响应函敎ͼ�(x��)<br>新徏一菜单栏：(x��)IDR_MENUNEW,讄���为POP-UP;<br>讄���子菜单：(x��)IDR_ITEM1.点击ClassWizard�Q�选择当前文档�cȝ��击ON_COMMAND讄���响应函数�?
<img src ="http://www.shnenglu.com/huxiaofeng/aggbug/101379.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.shnenglu.com/huxiaofeng/" target="_blank">�?/a> 2009-11-19 14:03 <a href="http://www.shnenglu.com/huxiaofeng/archive/2009/11/19/101379.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item></channel></rss>                                                                                                                                                                                                                                                                                                                             <footer>
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