??xml version="1.0" encoding="utf-8" standalone="yes"?>久久久久久噜噜精品免费直播,精品久久久一二三区,国产精品无码久久久久久http://www.shnenglu.com/suiaiguo/category/11218.html天行健,君子以自Z息; 地势坤,君子以厚徯?/description>zh-cnTue, 21 Jul 2009 09:02:13 GMTTue, 21 Jul 2009 09:02:13 GMT60DLL入门析Q?Q——用DLL在进E间׃n数据http://www.shnenglu.com/suiaiguo/archive/2009/07/21/90734.htmlSagaSagaTue, 21 Jul 2009 07:06:00 GMThttp://www.shnenglu.com/suiaiguo/archive/2009/07/21/90734.htmlhttp://www.shnenglu.com/suiaiguo/comments/90734.htmlhttp://www.shnenglu.com/suiaiguo/archive/2009/07/21/90734.html#Feedback0http://www.shnenglu.com/suiaiguo/comments/commentRss/90734.htmlhttp://www.shnenglu.com/suiaiguo/services/trackbacks/90734.html         在Win16环境中,DLL的全局数据Ҏ(gu)个蝲入它的进E来说都是相同的,因ؓ所有的q程用的都收同一块地址I间Q而在Win32环境中,情况却发生了变化Q每个进E都有了它自q地址I间QDLL函数中的代码所创徏的Q何对象(包括变量Q都归调用它的进E所有。当q程在蝲入DLLӞ操作pȝ自动把DLL地址映射到该q程的私有空_也就是进E的虚拟地址I间Q而且也复制该DLL的全局数据的一份拷贝到该进E空间。(在物理内存中Q多q程载入DLLӞDLL的代码段实际上是只加载了一ơ,只是物理地址映射C各个调用它的q程的虚拟地址I间中,而全局数据会在每个q程都分别加载)。也是说每个进E所拥有的相同的DLL的全局数据Q它们的名称相同Q但其值却q不一定是相同的,而且是互不干涉的?br>因此Q在Win32环境下要惛_多个q程中共享数据,必进行必要的讄。在讉K同一个Dll的各q程之间׃n存储器是通过存储器映文件技术实现的。也可以把这些需要共享的数据分离出来Q放|在一个独立的数据D里Qƈ把该D늚属性设|ؓ׃n。必ȝq些变量赋初|否则~译器会把没有赋初始值的变量攑֜一个叫未被初始化的数据D中?/p>

在DLL的实现文件中d下列代码Q?/p>

#pragma data_seg("DLLSharedSection")      // 声明׃n数据D,q命名该数据D?/span>
   int SharedData = 123;       // 必须在定义的同时q行初始?!!!
#pragma data_seg()

 

 ?pragma data_seg("DLLSharedSection")?pragma data_seg()之间的所有变量将被访问该Dll的所有进E看到和׃n。仅定义一个数据段q不能达到共享数据的目的Q还要告诉编译器该段的属性,有三U方法可以实现该目的Q其效果是相同的Q,一U方法是?DEF文g中加入如下语句:

SETCTIONS
    DLLSharedSection READ WRITE SHARED

 

另一U方法是在项目设|的链接选项(Project Setting --〉Link)中加入如下语句:

/SECTION:DLLSharedSection,rws

 

q有一U就是用指令:

#pragma comment(linker,"/section:.DLLSharedSection,rws")


那么q个数据节中的数据可以在所有DLL的实例之间共享了。所有对q些数据的操作都针对同一个实例的Q而不是在每个q程的地址I间中都有一份?br> 
当进E隐式或昑ּ调用一个动态库里的函数Ӟpȝ都要把这个动态库映射到这个进E的虚拟地址I间里。这使得DLL成ؓq程的一部分Q以q个q程的n份执行,使用q个q程的堆栈?/p>

下面来谈一下在具体使用׃n数据D|需要注意的一些问题:

·         所有在׃n数据D中的变量,只有在数据段中经q了初始化之后,才会是进E间׃n的。如果没有初始化Q那么进E间讉K该变量则是未定义的?br>·         所有的׃n变量都要攄在共享数据段中。如何定义很大的数组Q那么也会导致很大的DLL?br>·         不要在共享数据段中存放进E相关的信息。Win32中大多数的数据结构和|比如HANDLEQ只在特定的q程上下文中才是有效地?br>·         每个q程都有它自q地址I间。因此不要在׃n数据D中׃n指针Q指针指向的地址在不同的地址I间中是不一L?br>·         DLL在每个进E中是被映射在不同的虚拟地址I间中的Q因此函数指针也是不安全的?br>
当然q有其它的方法来q行q程间的数据׃nQ比如文件内存映等Q这涉及到通用的进E间通信了,q里׃多讲了?/p>

Saga 2009-07-21 15:06 发表评论
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DLL入门析Q?Q——从DLL中导出类http://www.shnenglu.com/suiaiguo/archive/2009/07/20/90663.htmlSagaSagaMon, 20 Jul 2009 12:50:00 GMThttp://www.shnenglu.com/suiaiguo/archive/2009/07/20/90663.htmlhttp://www.shnenglu.com/suiaiguo/comments/90663.htmlhttp://www.shnenglu.com/suiaiguo/archive/2009/07/20/90663.html#Feedback4http://www.shnenglu.com/suiaiguo/comments/commentRss/90663.htmlhttp://www.shnenglu.com/suiaiguo/services/trackbacks/90663.html
DLL头文Ӟ
#ifndef _DLL_SAMPLE_H
#define _DLL_SAMPLE_H

// 通过宏来控制是导入还是导?/span>
#ifdef _DLL_SAMPLE
#define DLL_SAMPLE_API __declspec(dllexport)
#else
#define DLL_SAMPLE_API __declspec(dllimport)
#endif

// 导出/导入变量声明
DLL_SAMPLE_API class DLLClass
{
  
public:
    
void Show();
}
;

#undef DLL_SAMPLE_API

#endif

DLL实现文gQ?
#include "stdafx.h"
#define _DLL_SAMPLE

#ifndef _DLL_SAMPLE_H
#include 
"DLLSample.h"
#endif

#include 
"stdio.h"

//APIENTRY声明DLL函数入口?/span>
BOOL APIENTRY DllMain(HANDLE hModule, DWORD ul_reason_for_call, LPVOID lpReserved)
{
 
switch (ul_reason_for_call)
 
{
  
case DLL_PROCESS_ATTACH:
  
case DLL_THREAD_ATTACH:
  
case DLL_THREAD_DETACH:
  
case DLL_PROCESS_DETACH:
   
break;
 }

 
return TRUE;
}


void DLLClass::Show()
{
  printf(
"DLLClass show!");
}

应用E序调用DLL
#include "DLLSample.h"

#pragma comment(lib,
"DLLSample.lib")


int main(int argc, char *argv[])
{
 DLLClass dc;
  dc.Show();
 
return 0;
}


大家可能发现了,上面我没有用模块定义文Ӟ.defQ声明导出类也没有用昑ּ链接导入DLL?
用Depends查看前面~译出来的DLL文gQ会发现里面导出了很奇怪的symbolQ这是因为C++~译器在~译时会对symbolq行修饰?br>q是我从别h那儿转来的截图?/p>



|上找了下,发现了C++~译时函数名的修饰约定规?/p>

__stdcall调用U定Q?/p>

1、以"?"标识函数名的开始,后跟函数名;
2、函数名后面?@@YG"标识参数表的开始,后跟参数表;
3、参数表以代可C:

X——voidQ?br>D——charQ?br>E——unsigned charQ?br>F——shortQ?br>H——intQ?br>I——unsigned intQ?br>J——longQ?br>K——unsigned longQ?br>M——floatQ?br>N——doubleQ?br>_N——boolQ?br>....

  PA——表C指针,后面的代可明指针类型,如果相同cd的指针连l出玎ͼ?0"代替Q一?0"代表一ơ重复;
4、参数表的第一ؓ该函数的q回值类型,其后依次为参数的数据cd,指针标识在其所指数据类型前Q?
5、参数表后以"@Z"标识整个名字的结束,如果该函数无参数Q则?Z"标识l束?br>  其格式ؓ"?functionname@@YG*****@Z"?a href="mailto:?functionname@@YG*XZ">?functionname@@YG*XZQ?/p>

    int Test1Qchar *var1,unsigned longQ?a href="mailto:-----“?Test1@@YGHPADK@Z”">-----“?Test1@@YGHPADK@Z”
     void Test2Q)                          -----“?Test2@@YGXXZ”

__cdecl调用U定Q?br>  规则同上面的_stdcall调用U定Q只是参数表的开始标识由上面?@@YG"变ؓ"@@YA"?/p>

__fastcall调用U定Q?br>  规则同上面的_stdcall调用U定Q只是参数表的开始标识由上面?@@YG"变ؓ"@@YI"?br>
VC++对函数的省缺声明?__cedcl",只能被C/C++调用?br>
虽然因ؓC++~译器对symbolq行修饰的原因不能直接用def文g声明导出cd昑ּ链接Q但是可以用另外一U取巧的方式?/p> 在头文g中类的声明中d一个友元函敎ͼ
friend DLLClass* CreatDLLClass();
然后声明CreatDLLClass()为导出函敎ͼ通过调用该函数返回一个DLLClasscȝ对象Q同栯C导出cȝ目的?br>q样Q就可以用显式链接来调用CreatDLLClass()Q从而得到类对象了?

Saga 2009-07-20 20:50 发表评论
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DLL入门析Q?Q——从DLL中导出变?/title><link>http://www.shnenglu.com/suiaiguo/archive/2009/07/20/90643.html</link><dc:creator>Saga</dc:creator><author>Saga</author><pubDate>Mon, 20 Jul 2009 09:37:00 GMT</pubDate><guid>http://www.shnenglu.com/suiaiguo/archive/2009/07/20/90643.html</guid><wfw:comment>http://www.shnenglu.com/suiaiguo/comments/90643.html</wfw:comment><comments>http://www.shnenglu.com/suiaiguo/archive/2009/07/20/90643.html#Feedback</comments><slash:comments>2</slash:comments><wfw:commentRss>http://www.shnenglu.com/suiaiguo/comments/commentRss/90643.html</wfw:commentRss><trackback:ping>http://www.shnenglu.com/suiaiguo/services/trackbacks/90643.html</trackback:ping><description><![CDATA[<p>   前面介绍了怎么从DLL中导出函敎ͼ下面我们来看一下如何从DLL中导出变量来?/p> <p>   声明为导出变量时Q同h两种Ҏ(gu)Q?br>   W一U是用__declspecq行导出声明</p> <div style="BORDER-RIGHT: #cccccc 1px solid; PADDING-RIGHT: 5px; BORDER-TOP: #cccccc 1px solid; PADDING-LEFT: 4px; FONT-SIZE: 13px; PADDING-BOTTOM: 4px; BORDER-LEFT: #cccccc 1px solid; WIDTH: 98%; WORD-BREAK: break-all; PADDING-TOP: 4px; BORDER-BOTTOM: #cccccc 1px solid; BACKGROUND-COLOR: #eeeeee"><img src="http://www.shnenglu.com/Images/OutliningIndicators/None.gif" align=top><span style="COLOR: #000000">#ifndef _DLL_SAMPLE_H<br><img src="http://www.shnenglu.com/Images/OutliningIndicators/None.gif" align=top></span><span style="COLOR: #0000ff">#define</span><span style="COLOR: #000000"> _DLL_SAMPLE_H</span><span style="COLOR: #000000"><br><img src="http://www.shnenglu.com/Images/OutliningIndicators/None.gif" align=top><br><img src="http://www.shnenglu.com/Images/OutliningIndicators/None.gif" align=top></span><span style="COLOR: #008000">//</span><span style="COLOR: #008000"> 如果定义了C++~译器,那么声明为C链接方式</span><span style="COLOR: #008000"><br><img src="http://www.shnenglu.com/Images/OutliningIndicators/None.gif" align=top></span><span style="COLOR: #000000">#ifdef __cplusplus<br><img id=Codehighlighter1_101_342_Open_Image onclick="this.style.display='none'; Codehighlighter1_101_342_Open_Text.style.display='none'; Codehighlighter1_101_342_Closed_Image.style.display='inline'; Codehighlighter1_101_342_Closed_Text.style.display='inline';" src="http://www.shnenglu.com/Images/OutliningIndicators/ExpandedBlockStart.gif" align=top><img id=Codehighlighter1_101_342_Closed_Image style="DISPLAY: none" onclick="this.style.display='none'; Codehighlighter1_101_342_Closed_Text.style.display='none'; Codehighlighter1_101_342_Open_Image.style.display='inline'; Codehighlighter1_101_342_Open_Text.style.display='inline';" src="http://www.shnenglu.com/Images/OutliningIndicators/ContractedBlock.gif" align=top></span><span style="COLOR: #0000ff">extern</span><span style="COLOR: #000000"> </span><span style="COLOR: #000000">"</span><span style="COLOR: #000000">C</span><span style="COLOR: #000000">"</span><span style="COLOR: #000000"> </span><span id=Codehighlighter1_101_342_Closed_Text style="BORDER-RIGHT: #808080 1px solid; BORDER-TOP: #808080 1px solid; DISPLAY: none; BORDER-LEFT: #808080 1px solid; BORDER-BOTTOM: #808080 1px solid; BACKGROUND-COLOR: #ffffff"><img src="http://www.shnenglu.com/Images/dot.gif"></span><span id=Codehighlighter1_101_342_Open_Text><span style="COLOR: #000000">{<br><img src="http://www.shnenglu.com/Images/OutliningIndicators/InBlock.gif" align=top></span><span style="COLOR: #0000ff">#endif</span><span style="COLOR: #000000"><br><img src="http://www.shnenglu.com/Images/OutliningIndicators/InBlock.gif" align=top><br><img src="http://www.shnenglu.com/Images/OutliningIndicators/InBlock.gif" align=top></span><span style="COLOR: #008000">//</span><span style="COLOR: #008000"> 通过宏来控制是导入还是导?/span><span style="COLOR: #008000"><br><img src="http://www.shnenglu.com/Images/OutliningIndicators/InBlock.gif" align=top></span><span style="COLOR: #000000">#ifdef _DLL_SAMPLE<br><img src="http://www.shnenglu.com/Images/OutliningIndicators/InBlock.gif" align=top></span><span style="COLOR: #0000ff">#define</span><span style="COLOR: #000000"> DLL_SAMPLE_API __declspec(dllexport)</span><span style="COLOR: #000000"><br><img src="http://www.shnenglu.com/Images/OutliningIndicators/InBlock.gif" align=top></span><span style="COLOR: #0000ff">#else</span><span style="COLOR: #000000"><br><img src="http://www.shnenglu.com/Images/OutliningIndicators/InBlock.gif" align=top></span><span style="COLOR: #0000ff">#define</span><span style="COLOR: #000000"> DLL_SAMPLE_API __declspec(dllimport)</span><span style="COLOR: #000000"><br><img src="http://www.shnenglu.com/Images/OutliningIndicators/InBlock.gif" align=top></span><span style="COLOR: #0000ff">#endif</span><span style="COLOR: #000000"><br><img src="http://www.shnenglu.com/Images/OutliningIndicators/InBlock.gif" align=top><br><img src="http://www.shnenglu.com/Images/OutliningIndicators/InBlock.gif" align=top></span><span style="COLOR: #008000">//</span><span style="COLOR: #008000"> 导出/导入变量声明</span><span style="COLOR: #008000"><br><img src="http://www.shnenglu.com/Images/OutliningIndicators/InBlock.gif" align=top></span><span style="COLOR: #000000">DLL_SAMPLE_API </span><span style="COLOR: #0000ff">extern</span><span style="COLOR: #000000"> </span><span style="COLOR: #0000ff">int</span><span style="COLOR: #000000"> DLLData;<br><img src="http://www.shnenglu.com/Images/OutliningIndicators/InBlock.gif" align=top><br><img src="http://www.shnenglu.com/Images/OutliningIndicators/InBlock.gif" align=top></span><span style="COLOR: #0000ff">#undef</span><span style="COLOR: #000000"> DLL_SAMPLE_API</span><span style="COLOR: #000000"><br><img src="http://www.shnenglu.com/Images/OutliningIndicators/InBlock.gif" align=top><br><img src="http://www.shnenglu.com/Images/OutliningIndicators/InBlock.gif" align=top>#ifdef __cplusplus<br><img src="http://www.shnenglu.com/Images/OutliningIndicators/ExpandedBlockEnd.gif" align=top>}</span></span><span style="COLOR: #000000"><br><img src="http://www.shnenglu.com/Images/OutliningIndicators/None.gif" align=top></span><span style="COLOR: #0000ff">#endif</span><span style="COLOR: #000000"><br><img src="http://www.shnenglu.com/Images/OutliningIndicators/None.gif" align=top><br><img src="http://www.shnenglu.com/Images/OutliningIndicators/None.gif" align=top></span><span style="COLOR: #0000ff">#endif</span><span style="COLOR: #000000"><br><img src="http://www.shnenglu.com/Images/OutliningIndicators/None.gif" align=top></span></div> <p> </p> <p>  W二U是用模块定义文Ӟ.defQ进行导出声?/p> <div style="BORDER-RIGHT: #cccccc 1px solid; PADDING-RIGHT: 5px; BORDER-TOP: #cccccc 1px solid; PADDING-LEFT: 4px; FONT-SIZE: 13px; PADDING-BOTTOM: 4px; BORDER-LEFT: #cccccc 1px solid; WIDTH: 98%; WORD-BREAK: break-all; PADDING-TOP: 4px; BORDER-BOTTOM: #cccccc 1px solid; BACKGROUND-COLOR: #eeeeee"><img src="http://www.shnenglu.com/Images/OutliningIndicators/None.gif" align=top><span style="COLOR: #000000">LIBRARY DLLSample<br><img src="http://www.shnenglu.com/Images/OutliningIndicators/None.gif" align=top>DESCRIPTION </span><span style="COLOR: #000000">"</span><span style="COLOR: #000000">my simple DLL</span><span style="COLOR: #000000">"</span><span style="COLOR: #000000"><br><img src="http://www.shnenglu.com/Images/OutliningIndicators/None.gif" align=top>EXPORTS<br><img src="http://www.shnenglu.com/Images/OutliningIndicators/None.gif" align=top>        DLLData DATA  QDATA表示q是数据Q变量)</span></div> <p> </p>    下面是DLL的实现文? <div style="BORDER-RIGHT: #cccccc 1px solid; PADDING-RIGHT: 5px; BORDER-TOP: #cccccc 1px solid; PADDING-LEFT: 4px; FONT-SIZE: 13px; PADDING-BOTTOM: 4px; BORDER-LEFT: #cccccc 1px solid; WIDTH: 98%; WORD-BREAK: break-all; PADDING-TOP: 4px; BORDER-BOTTOM: #cccccc 1px solid; BACKGROUND-COLOR: #eeeeee"><img src="http://www.shnenglu.com/Images/OutliningIndicators/None.gif" align=top><span style="COLOR: #000000">#include </span><span style="COLOR: #000000">"</span><span style="COLOR: #000000">stdafx.h</span><span style="COLOR: #000000">"</span><span style="COLOR: #000000"><br><img src="http://www.shnenglu.com/Images/OutliningIndicators/None.gif" align=top></span><span style="COLOR: #0000ff">#define</span><span style="COLOR: #000000"> _DLL_SAMPLE</span><span style="COLOR: #000000"><br><img src="http://www.shnenglu.com/Images/OutliningIndicators/None.gif" align=top><br><img src="http://www.shnenglu.com/Images/OutliningIndicators/None.gif" align=top>#ifndef _DLL_SAMPLE_H<br><img src="http://www.shnenglu.com/Images/OutliningIndicators/None.gif" align=top>#include </span><span style="COLOR: #000000">"</span><span style="COLOR: #000000">DLLSample.h</span><span style="COLOR: #000000">"</span><span style="COLOR: #000000"><br><img src="http://www.shnenglu.com/Images/OutliningIndicators/None.gif" align=top></span><span style="COLOR: #0000ff">#endif</span><span style="COLOR: #000000"><br><img src="http://www.shnenglu.com/Images/OutliningIndicators/None.gif" align=top><br><img src="http://www.shnenglu.com/Images/OutliningIndicators/None.gif" align=top>#include </span><span style="COLOR: #000000">"</span><span style="COLOR: #000000">stdio.h</span><span style="COLOR: #000000">"</span><span style="COLOR: #000000"><br><img src="http://www.shnenglu.com/Images/OutliningIndicators/None.gif" align=top><br><img src="http://www.shnenglu.com/Images/OutliningIndicators/None.gif" align=top></span><span style="COLOR: #0000ff">int</span><span style="COLOR: #000000"> DLLData;<br><img src="http://www.shnenglu.com/Images/OutliningIndicators/None.gif" align=top><br><img src="http://www.shnenglu.com/Images/OutliningIndicators/None.gif" align=top></span><span style="COLOR: #008000">//</span><span style="COLOR: #008000">APIENTRY声明DLL函数入口?/span><span style="COLOR: #008000"><br><img src="http://www.shnenglu.com/Images/OutliningIndicators/None.gif" align=top></span><span style="COLOR: #000000">BOOL APIENTRY DllMain(HANDLE hModule, DWORD ul_reason_for_call, LPVOID lpReserved)<br><img id=Codehighlighter1_232_451_Open_Image onclick="this.style.display='none'; Codehighlighter1_232_451_Open_Text.style.display='none'; Codehighlighter1_232_451_Closed_Image.style.display='inline'; Codehighlighter1_232_451_Closed_Text.style.display='inline';" src="http://www.shnenglu.com/Images/OutliningIndicators/ExpandedBlockStart.gif" align=top><img id=Codehighlighter1_232_451_Closed_Image style="DISPLAY: none" onclick="this.style.display='none'; Codehighlighter1_232_451_Closed_Text.style.display='none'; Codehighlighter1_232_451_Open_Image.style.display='inline'; Codehighlighter1_232_451_Open_Text.style.display='inline';" src="http://www.shnenglu.com/Images/OutliningIndicators/ContractedBlock.gif" align=top></span><span id=Codehighlighter1_232_451_Closed_Text style="BORDER-RIGHT: #808080 1px solid; BORDER-TOP: #808080 1px solid; DISPLAY: none; BORDER-LEFT: #808080 1px solid; BORDER-BOTTOM: #808080 1px solid; BACKGROUND-COLOR: #ffffff"><img src="http://www.shnenglu.com/Images/dot.gif"></span><span id=Codehighlighter1_232_451_Open_Text><span style="COLOR: #000000">{<br><img src="http://www.shnenglu.com/Images/OutliningIndicators/InBlock.gif" align=top> </span><span style="COLOR: #0000ff">switch</span><span style="COLOR: #000000"> (ul_reason_for_call)<br><img id=Codehighlighter1_264_435_Open_Image onclick="this.style.display='none'; Codehighlighter1_264_435_Open_Text.style.display='none'; Codehighlighter1_264_435_Closed_Image.style.display='inline'; Codehighlighter1_264_435_Closed_Text.style.display='inline';" src="http://www.shnenglu.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif" align=top><img id=Codehighlighter1_264_435_Closed_Image style="DISPLAY: none" onclick="this.style.display='none'; Codehighlighter1_264_435_Closed_Text.style.display='none'; Codehighlighter1_264_435_Open_Image.style.display='inline'; Codehighlighter1_264_435_Open_Text.style.display='inline';" src="http://www.shnenglu.com/Images/OutliningIndicators/ContractedSubBlock.gif" align=top> </span><span id=Codehighlighter1_264_435_Closed_Text style="BORDER-RIGHT: #808080 1px solid; BORDER-TOP: #808080 1px solid; DISPLAY: none; BORDER-LEFT: #808080 1px solid; BORDER-BOTTOM: #808080 1px solid; BACKGROUND-COLOR: #ffffff"><img src="http://www.shnenglu.com/Images/dot.gif"></span><span id=Codehighlighter1_264_435_Open_Text><span style="COLOR: #000000">{<br><img src="http://www.shnenglu.com/Images/OutliningIndicators/InBlock.gif" align=top>  </span><span style="COLOR: #0000ff">case</span><span style="COLOR: #000000"> DLL_PROCESS_ATTACH:<br><img src="http://www.shnenglu.com/Images/OutliningIndicators/InBlock.gif" align=top>      DLLData </span><span style="COLOR: #000000">=</span><span style="COLOR: #000000"> </span><span style="COLOR: #000000">123</span><span style="COLOR: #000000">;  </span><span style="COLOR: #008000">//</span><span style="COLOR: #008000"> 在入口函C对变量进行初始化</span><span style="COLOR: #008000"><br><img src="http://www.shnenglu.com/Images/OutliningIndicators/InBlock.gif" align=top></span><span style="COLOR: #000000">      </span><span style="COLOR: #0000ff">break</span><span style="COLOR: #000000"><br><img src="http://www.shnenglu.com/Images/OutliningIndicators/InBlock.gif" align=top>  </span><span style="COLOR: #0000ff">case</span><span style="COLOR: #000000"> DLL_THREAD_ATTACH:<br><img src="http://www.shnenglu.com/Images/OutliningIndicators/InBlock.gif" align=top>  </span><span style="COLOR: #0000ff">case</span><span style="COLOR: #000000"> DLL_THREAD_DETACH:<br><img src="http://www.shnenglu.com/Images/OutliningIndicators/InBlock.gif" align=top>  </span><span style="COLOR: #0000ff">case</span><span style="COLOR: #000000"> DLL_PROCESS_DETACH:<br><img src="http://www.shnenglu.com/Images/OutliningIndicators/InBlock.gif" align=top>   </span><span style="COLOR: #0000ff">break</span><span style="COLOR: #000000">;<br><img src="http://www.shnenglu.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif" align=top> }</span></span><span style="COLOR: #000000"><br><img src="http://www.shnenglu.com/Images/OutliningIndicators/InBlock.gif" align=top> </span><span style="COLOR: #0000ff">return</span><span style="COLOR: #000000"> TRUE;<br><img src="http://www.shnenglu.com/Images/OutliningIndicators/ExpandedBlockEnd.gif" align=top>}</span></span><span style="COLOR: #000000"><br><img src="http://www.shnenglu.com/Images/OutliningIndicators/None.gif" align=top></span></div> <p><br>同样Q应用程序调用DLL中的变量也有两种Ҏ(gu)?br>W一U是隐式链接Q?/p> <div style="BORDER-RIGHT: #cccccc 1px solid; PADDING-RIGHT: 5px; BORDER-TOP: #cccccc 1px solid; PADDING-LEFT: 4px; FONT-SIZE: 13px; PADDING-BOTTOM: 4px; BORDER-LEFT: #cccccc 1px solid; WIDTH: 98%; WORD-BREAK: break-all; PADDING-TOP: 4px; BORDER-BOTTOM: #cccccc 1px solid; BACKGROUND-COLOR: #eeeeee"><img src="http://www.shnenglu.com/Images/OutliningIndicators/None.gif" align=top><span style="COLOR: #000000">#include </span><span style="COLOR: #000000"><</span><span style="COLOR: #000000">stdio.h</span><span style="COLOR: #000000">></span><span style="COLOR: #000000"><br><img src="http://www.shnenglu.com/Images/OutliningIndicators/None.gif" align=top>#include </span><span style="COLOR: #000000">"</span><span style="COLOR: #000000">DLLSample.h</span><span style="COLOR: #000000">"</span><span style="COLOR: #000000"><br><img src="http://www.shnenglu.com/Images/OutliningIndicators/None.gif" align=top><br><img src="http://www.shnenglu.com/Images/OutliningIndicators/None.gif" align=top>#pragma comment(lib,</span><span style="COLOR: #000000">"</span><span style="COLOR: #000000">DLLSample.lib</span><span style="COLOR: #000000">"</span><span style="COLOR: #000000">)<br><img src="http://www.shnenglu.com/Images/OutliningIndicators/None.gif" align=top><br><img src="http://www.shnenglu.com/Images/OutliningIndicators/None.gif" align=top><br><img src="http://www.shnenglu.com/Images/OutliningIndicators/None.gif" align=top></span><span style="COLOR: #0000ff">int</span><span style="COLOR: #000000"> main(</span><span style="COLOR: #0000ff">int</span><span style="COLOR: #000000"> argc, </span><span style="COLOR: #0000ff">char</span><span style="COLOR: #000000"> </span><span style="COLOR: #000000">*</span><span style="COLOR: #000000">argv[])<br><img id=Codehighlighter1_115_155_Open_Image onclick="this.style.display='none'; Codehighlighter1_115_155_Open_Text.style.display='none'; Codehighlighter1_115_155_Closed_Image.style.display='inline'; Codehighlighter1_115_155_Closed_Text.style.display='inline';" src="http://www.shnenglu.com/Images/OutliningIndicators/ExpandedBlockStart.gif" align=top><img id=Codehighlighter1_115_155_Closed_Image style="DISPLAY: none" onclick="this.style.display='none'; Codehighlighter1_115_155_Closed_Text.style.display='none'; Codehighlighter1_115_155_Open_Image.style.display='inline'; Codehighlighter1_115_155_Open_Text.style.display='inline';" src="http://www.shnenglu.com/Images/OutliningIndicators/ContractedBlock.gif" align=top></span><span id=Codehighlighter1_115_155_Closed_Text style="BORDER-RIGHT: #808080 1px solid; BORDER-TOP: #808080 1px solid; DISPLAY: none; BORDER-LEFT: #808080 1px solid; BORDER-BOTTOM: #808080 1px solid; BACKGROUND-COLOR: #ffffff"><img src="http://www.shnenglu.com/Images/dot.gif"></span><span id=Codehighlighter1_115_155_Open_Text><span style="COLOR: #000000">{<br><img src="http://www.shnenglu.com/Images/OutliningIndicators/InBlock.gif" align=top> printf(</span><span style="COLOR: #000000">"</span><span style="COLOR: #000000">%d </span><span style="COLOR: #000000">"</span><span style="COLOR: #000000">, DLLSample);<br><img src="http://www.shnenglu.com/Images/OutliningIndicators/InBlock.gif" align=top> </span><span style="COLOR: #0000ff">return</span><span style="COLOR: #000000"> </span><span style="COLOR: #000000">0</span><span style="COLOR: #000000">;<br><img src="http://www.shnenglu.com/Images/OutliningIndicators/ExpandedBlockEnd.gif" align=top>}</span></span><span style="COLOR: #000000"><br><img src="http://www.shnenglu.com/Images/OutliningIndicators/None.gif" align=top><br><img src="http://www.shnenglu.com/Images/OutliningIndicators/None.gif" align=top></span></div> <p> <br>W二U是昑ּ链接Q?/p> <div style="BORDER-RIGHT: #cccccc 1px solid; PADDING-RIGHT: 5px; BORDER-TOP: #cccccc 1px solid; PADDING-LEFT: 4px; FONT-SIZE: 13px; PADDING-BOTTOM: 4px; BORDER-LEFT: #cccccc 1px solid; WIDTH: 98%; WORD-BREAK: break-all; PADDING-TOP: 4px; BORDER-BOTTOM: #cccccc 1px solid; BACKGROUND-COLOR: #eeeeee"><img src="http://www.shnenglu.com/Images/OutliningIndicators/None.gif" align=top><span style="COLOR: #000000">#include </span><span style="COLOR: #000000"><</span><span style="COLOR: #000000">iostream</span><span style="COLOR: #000000">></span><span style="COLOR: #000000"><br><img src="http://www.shnenglu.com/Images/OutliningIndicators/None.gif" align=top>#include </span><span style="COLOR: #000000"><</span><span style="COLOR: #000000">windows.h</span><span style="COLOR: #000000">></span><span style="COLOR: #000000"><br><img src="http://www.shnenglu.com/Images/OutliningIndicators/None.gif" align=top><br><img src="http://www.shnenglu.com/Images/OutliningIndicators/None.gif" align=top></span><span style="COLOR: #0000ff">int</span><span style="COLOR: #000000"> main()<br><img id=Codehighlighter1_53_484_Open_Image onclick="this.style.display='none'; Codehighlighter1_53_484_Open_Text.style.display='none'; Codehighlighter1_53_484_Closed_Image.style.display='inline'; Codehighlighter1_53_484_Closed_Text.style.display='inline';" src="http://www.shnenglu.com/Images/OutliningIndicators/ExpandedBlockStart.gif" align=top><img id=Codehighlighter1_53_484_Closed_Image style="DISPLAY: none" onclick="this.style.display='none'; Codehighlighter1_53_484_Closed_Text.style.display='none'; Codehighlighter1_53_484_Open_Image.style.display='inline'; Codehighlighter1_53_484_Open_Text.style.display='inline';" src="http://www.shnenglu.com/Images/OutliningIndicators/ContractedBlock.gif" align=top></span><span id=Codehighlighter1_53_484_Closed_Text style="BORDER-RIGHT: #808080 1px solid; BORDER-TOP: #808080 1px solid; DISPLAY: none; BORDER-LEFT: #808080 1px solid; BORDER-BOTTOM: #808080 1px solid; BACKGROUND-COLOR: #ffffff"><img src="http://www.shnenglu.com/Images/dot.gif"></span><span id=Codehighlighter1_53_484_Open_Text><span style="COLOR: #000000">{<br><img src="http://www.shnenglu.com/Images/OutliningIndicators/InBlock.gif" align=top>        </span><span style="COLOR: #0000ff">int</span><span style="COLOR: #000000"> my_int;<br><img src="http://www.shnenglu.com/Images/OutliningIndicators/InBlock.gif" align=top>        HINSTANCE hInstLibrary </span><span style="COLOR: #000000">=</span><span style="COLOR: #000000"> LoadLibrary(</span><span style="COLOR: #000000">"</span><span style="COLOR: #000000">DLLSample.dll</span><span style="COLOR: #000000">"</span><span style="COLOR: #000000">);<br><img src="http://www.shnenglu.com/Images/OutliningIndicators/InBlock.gif" align=top><br><img src="http://www.shnenglu.com/Images/OutliningIndicators/InBlock.gif" align=top>        </span><span style="COLOR: #0000ff">if</span><span style="COLOR: #000000"> (hInstLibrary </span><span style="COLOR: #000000">==</span><span style="COLOR: #000000"> NULL)<br><img id=Codehighlighter1_181_227_Open_Image onclick="this.style.display='none'; Codehighlighter1_181_227_Open_Text.style.display='none'; Codehighlighter1_181_227_Closed_Image.style.display='inline'; Codehighlighter1_181_227_Closed_Text.style.display='inline';" src="http://www.shnenglu.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif" align=top><img id=Codehighlighter1_181_227_Closed_Image style="DISPLAY: none" onclick="this.style.display='none'; Codehighlighter1_181_227_Closed_Text.style.display='none'; Codehighlighter1_181_227_Open_Image.style.display='inline'; Codehighlighter1_181_227_Open_Text.style.display='inline';" src="http://www.shnenglu.com/Images/OutliningIndicators/ContractedSubBlock.gif" align=top>        </span><span id=Codehighlighter1_181_227_Closed_Text style="BORDER-RIGHT: #808080 1px solid; BORDER-TOP: #808080 1px solid; DISPLAY: none; BORDER-LEFT: #808080 1px solid; BORDER-BOTTOM: #808080 1px solid; BACKGROUND-COLOR: #ffffff"><img src="http://www.shnenglu.com/Images/dot.gif"></span><span id=Codehighlighter1_181_227_Open_Text><span style="COLOR: #000000">{<br><img src="http://www.shnenglu.com/Images/OutliningIndicators/InBlock.gif" align=top>         FreeLibrary(hInstLibrary);<br><img src="http://www.shnenglu.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif" align=top>        }</span></span><span style="COLOR: #000000"><br><img src="http://www.shnenglu.com/Images/OutliningIndicators/InBlock.gif" align=top>        my_int </span><span style="COLOR: #000000">=</span><span style="COLOR: #000000"> </span><span style="COLOR: #000000">*</span><span style="COLOR: #000000">(</span><span style="COLOR: #0000ff">int</span><span style="COLOR: #000000">*</span><span style="COLOR: #000000">)GetProcAddress(hInstLibrary, </span><span style="COLOR: #000000">"</span><span style="COLOR: #000000">DLLData</span><span style="COLOR: #000000">"</span><span style="COLOR: #000000">);<br><img src="http://www.shnenglu.com/Images/OutliningIndicators/InBlock.gif" align=top>        </span><span style="COLOR: #0000ff">if</span><span style="COLOR: #000000"> (dllFunc </span><span style="COLOR: #000000">==</span><span style="COLOR: #000000"> NULL)<br><img id=Codehighlighter1_331_377_Open_Image onclick="this.style.display='none'; Codehighlighter1_331_377_Open_Text.style.display='none'; Codehighlighter1_331_377_Closed_Image.style.display='inline'; Codehighlighter1_331_377_Closed_Text.style.display='inline';" src="http://www.shnenglu.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif" align=top><img id=Codehighlighter1_331_377_Closed_Image style="DISPLAY: none" onclick="this.style.display='none'; Codehighlighter1_331_377_Closed_Text.style.display='none'; Codehighlighter1_331_377_Open_Image.style.display='inline'; Codehighlighter1_331_377_Open_Text.style.display='inline';" src="http://www.shnenglu.com/Images/OutliningIndicators/ContractedSubBlock.gif" align=top>        </span><span id=Codehighlighter1_331_377_Closed_Text style="BORDER-RIGHT: #808080 1px solid; BORDER-TOP: #808080 1px solid; DISPLAY: none; BORDER-LEFT: #808080 1px solid; BORDER-BOTTOM: #808080 1px solid; BACKGROUND-COLOR: #ffffff"><img src="http://www.shnenglu.com/Images/dot.gif"></span><span id=Codehighlighter1_331_377_Open_Text><span style="COLOR: #000000">{<br><img src="http://www.shnenglu.com/Images/OutliningIndicators/InBlock.gif" align=top>         FreeLibrary(hInstLibrary);<br><img src="http://www.shnenglu.com/Images/OutliningIndicators/ExpandedSubBlockEnd.gif" align=top>        }</span></span><span style="COLOR: #000000"><br><img src="http://www.shnenglu.com/Images/OutliningIndicators/InBlock.gif" align=top>        std::cout</span><span style="COLOR: #000000"><<</span><span style="COLOR: #000000">my_int;<br><img src="http://www.shnenglu.com/Images/OutliningIndicators/InBlock.gif" align=top>        std::cin.</span><span style="COLOR: #0000ff">get</span><span style="COLOR: #000000">();<br><img src="http://www.shnenglu.com/Images/OutliningIndicators/InBlock.gif" align=top>        FreeLibrary(hInstLibrary);<br><img src="http://www.shnenglu.com/Images/OutliningIndicators/InBlock.gif" align=top>        </span><span style="COLOR: #0000ff">return</span><span style="COLOR: #000000">(</span><span style="COLOR: #000000">1</span><span style="COLOR: #000000">);<br><img src="http://www.shnenglu.com/Images/OutliningIndicators/ExpandedBlockEnd.gif" align=top>}</span></span><span style="COLOR: #000000"><br><img src="http://www.shnenglu.com/Images/OutliningIndicators/None.gif" align=top></span></div> <p> </p> <p>通过GetProcAddress取出的函数或者变量都是地址Q因此,需要解引用q且转类型?/p> <p><br> </p> <img src ="http://www.shnenglu.com/suiaiguo/aggbug/90643.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.shnenglu.com/suiaiguo/" target="_blank">Saga</a> 2009-07-20 17:37 <a href="http://www.shnenglu.com/suiaiguo/archive/2009/07/20/90643.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>DLL入门析Q?Q——如何用DLLhttp://www.shnenglu.com/suiaiguo/archive/2009/07/20/90621.htmlSagaSagaMon, 20 Jul 2009 06:27:00 GMThttp://www.shnenglu.com/suiaiguo/archive/2009/07/20/90621.htmlhttp://www.shnenglu.com/suiaiguo/comments/90621.htmlhttp://www.shnenglu.com/suiaiguo/archive/2009/07/20/90621.html#Feedback1http://www.shnenglu.com/suiaiguo/comments/commentRss/90621.htmlhttp://www.shnenglu.com/suiaiguo/services/trackbacks/90621.html上文我简单的介绍了如何徏立一个简单DLLQ下面再我简单的介绍一下如何用一个DLL。当一个DLL被生成后Q它创徏了一?dll文g和一?lib文gQ这两个都是你需要的。要使用DLLQ就需要蝲入这个DLL?/p>

隐式链接

q里有两个方法来载入一个DLLQ一个方法是捷径另一个则相比要复杂些。捷径是只链接到?lib 文gq将.dll文g|入你的新项目的路径中去。因此,创徏一个新的空的Win32控制台项目ƈd一个源文g。将你做的DLL攑օ你的新项目相同的目录下?/p>

#include "stdafx.h"
#include 
"DLLSample.h"

#pragma comment(lib, 
"DLLSample.lib"//你也可以在项目属性中讄库的链接

int main()
{
        TestDLL(
123);
        
return(1);
}

q就是蝲入一个DLL的简单方法?/p>

昑ּ链接

隄的加载DLL的方法稍微有点复杂。你需要函数指针和一些Windows函数。但是,通过q种载入DLLs的方法,你不需要DLL?lib或头文gQ而只需要DLL?/p>

#include <iostream>
#include 
<windows.h>
typedef 
void (*DLLFunc)(int);
int main()
{
        DLLFunc dllFunc;
        HINSTANCE hInstLibrary 
= LoadLibrary("DLLSample.dll");

        
if (hInstLibrary == NULL)
        
{
         FreeLibrary(hInstLibrary);
        }

        dllFunc 
= (DLLFunc)GetProcAddress(hInstLibrary, "TestDLL");
        
if (dllFunc == NULL)
        
{
         FreeLibrary(hInstLibrary);
        }

        dllFunc(
123);
        std::cin.
get();
        FreeLibrary(hInstLibrary);
        
return(1);
}

     
首先你会注意刎ͼq里包括q了文g“windows.h”同时U走?#8220;DLLSample.h”。原因很单:因ؓwindows.h包含了一些Windows函数Q当然你现在只需要其中几个而已。它也包含了一些将会用到的Windows特定变量。你可以LDLL的头文gQDLLSample.hQ因为-如我前面所_当你使用q个Ҏ(gu)载入DLL时你q不需要它?/p>

下面你会看到Q下面的一句代?

typedef void (*DLLFunc)(int);
     
q是一个函数指针类型的定义。指向一个函数是一个int型的参数Q返回gؓvoidcd?/p>

一个HINSTANCE是一个Windows数据cdQ是一个实例的句柄Q在此情况下Q这个实例将是这个DLL。你可以通过使用函数LoadLibrary()获得DLL的实例,它获得一个名UC为参数。在调用LoadLibrary函数后,你必需查看一下函数返回是否成功。你可以通过查HINSTANCE是否{于NULLQ在Windows.h中定义ؓ0或Windows.h包含的一个头文gQ来查看其是否成功。如果其{于NULLQ该句柄是无效的,q且你必需释放q个库。换句话_你必需释放DLL获得的内存。如果函数返回成功,你的HINSTANCE包含了指向DLL的句柄?/p>

一旦你获得了指向DLL的句柄,你现在可以从DLL中重新获得函数。ؓ了这样作Q你必须使用函数GetProcAddress()Q它?yu)DLL的句柄(你可以用HINSTANCEQ和函数的名UC为参数。你可以让函数指针获得由GetProcAddress()q回的|同时你必需GetProcAddress()转换为那个函数定义的函数指针。D个例子,对于Add()函数Q你必需GetProcAddress()转换为AddFuncQ这是它知道参数及q回值的原因。现在,最好先定函数指针是否{于NULL以及它们拥有DLL的函数。这只是一个简单的if语句Q如果其中一个等于NULLQ你必需如前所q释攑ֺ?/p>

一旦函数指针拥有DLL的函敎ͼ你现在就可以使用它们了,但是q里有一个需要注意的地方Q你不能使用函数的实际名Uͼ你必需使用函数指针来调用它们。在那以后,所有你需要做的是释放库如此而已?/p>

模块句柄

q程中的每个DLL模块被全局唯一?2字节的HINSTANCE句柄标识。进E自p有一个HINSTANCE句柄。所有这些模块句柄都只有在特定的q程内部有效Q它们代表了DLL或EXE模块在进E虚拟空间中的v始地址。在Win32中,HINSTANCE和HMODULE的值是相同的,q个两种cd可以替换使用。进E模块句柄几乎L{于0x400000Q而DLL模块的加载地址的缺省句柄是0x10000000。如果程序同时用了几个DLL模块Q每一个都会有不同的HINSTANCE倹{这是因为在创徏DLL文g时指定了不同的基地址Q或者是因ؓ加蝲E序对DLL代码q行了重定位?br>模块句柄对于加蝲资源特别重要。Win32 的FindResource函数中带有一个HINSTANCE参数。EXE和DLL都有其自q资源。如果应用程序需要来自于DLL的资源,将此参数指定ؓDLL的模块句柄。如果需要EXE文g中包含的资源Q就指定EXE的模块句柄?br>但是在用这些句柄之前存在一个问题,你怎样得到它们呢?如果需要得到EXE模块句柄Q调用带有Null参数的Win32函数GetModuleHandleQ如果需要DLL模块句柄Q就调用以DLL文g名ؓ参数的Win32函数GetModuleHandle?/p>

应用E序怎样扑ֈDLL文g

如果应用E序使用LoadLibrary昑ּ链接Q那么在q个函数的参C可以指定DLL文g的完整\径。如果不指定路径Q或是进行隐式链接,Windows遵循下面的搜烦序来定位DLLQ?br>1Q?包含EXE文g的目录,
2Q?q程的当前工作目录,
3Q?Windowspȝ目录Q?br>4Q?Windows目录Q?br>5Q?列在Path环境变量中的一pd目录?br>q里有一个很Ҏ(gu)发生错误的陷阱。如果你使用VCQ+q行目开发,q且为DLL模块专门创徏了一个项目,然后生成的DLL文g拯到系l目录下Q从应用E序中调用DLL模块。到目前为止Q一切正常。接下来对DLL模块做了一些修改后重新生成了新的DLL文gQ但你忘记将新的DLL文g拯到系l目录下。下一ơ当你运行应用程序时Q它仍加载了老版本的DLL文gQ这可要当心Q?/p>

调试DLLE序

Microsoft 的VCQ+是开发和试DLL的有效工P只需从DLL目中运行调试程序即可。当你第一ơ这h作时Q调试程序会向你询问EXE文g的\径。此后每ơ在调试E序中运行DLLӞ调试E序会自动加载该EXE文g。然后该EXE文g用上面的搜烦序列发现DLL文gQ这意味着你必设|Path环境变量让其包含DLL文g的磁盘\径,或者也可以DLL文g拯到搜索序列中的目录\径下?br>或者当你调试EXEE序Ӟ在Project Setting中,Debug选项卡中的Category讄为Additional DLLs。就可以同时调试EXE和它调用的DLLQ当Ӟ你需要有DLL的源代码Q了?br>   



Saga 2009-07-20 14:27 发表评论
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DLL入门析Q?Q——如何徏立DLLhttp://www.shnenglu.com/suiaiguo/archive/2009/07/20/90619.htmlSagaSagaMon, 20 Jul 2009 05:49:00 GMThttp://www.shnenglu.com/suiaiguo/archive/2009/07/20/90619.htmlhttp://www.shnenglu.com/suiaiguo/comments/90619.htmlhttp://www.shnenglu.com/suiaiguo/archive/2009/07/20/90619.html#Feedback1http://www.shnenglu.com/suiaiguo/comments/commentRss/90619.htmlhttp://www.shnenglu.com/suiaiguo/services/trackbacks/90619.html
   动态链接库QDLLQ是从C语言函数库和Pascal库单元的概念发展而来的。所有的C语言标准库函数都存放在某一函数库中。在链接应用E序的过E中Q链接器从库文g中拷贝程序调用的函数代码Qƈ把这些函C码添加到可执行文件中。这U方法同只把函数储存在已~译的OBJ文g中相比更有利于代码的重用。但随着Windowsq样的多d环境的出玎ͼ函数库的Ҏ(gu)昑־q于累赘。如果ؓ了完成屏q输出、消息处理、内存管理、对话框{操作,每个E序都不得不拥有自己的函敎ͼ那么WindowsE序变得非常庞大。Windows的发展要求允许同时运行的几个E序׃n一l函数的单一拯。动态链接库是在这U情况下出现的。动态链接库不用重复~译或链接,一旦装入内存,DLL函数可以被系l中的Q何正在运行的应用E序软g所使用Q而不必再DLL函数的另一拯装入内存?br>
   下面我们一步一步来建立一个DLL?br>
   一、徏立一个DLL工程
   新徏一个工E,选择Win32 控制台项目(Win32 Console ApplicationQ,q且在应用程序设|标{(the advanced tabQ上Q选择DLL和空目选项?br>
   二、声明导出函?br>   q里有两U方法声明导出函敎ͼ一U是通过使用__declspec(dllexport)Q添加到需要导出的函数前,q行声明Q另外一U就是通过模块定义文gQModule-Definition File?DEFQ来q行声明?br>   W一U方法,建立头文件DLLSample.hQ在头文件中Q对需要导出的函数q行声明?
#ifndef _DLL_SAMPLE_H
#define _DLL_SAMPLE_H

// 如果定义了C++~译器,那么声明为C链接方式
#ifdef __cplusplus
extern "C" {
#endif

// 通过宏来控制是导入还是导?/span>
#ifdef _DLL_SAMPLE
#define DLL_SAMPLE_API __declspec(dllexport)
#else
#define DLL_SAMPLE_API __declspec(dllimport)
#endif

// 导出/导入函数声明
DLL_SAMPLE_API void TestDLL(int);

#undef DLL_SAMPLE_API

#ifdef __cplusplus
}

#endif

#endif

   q个头文件会分别被DLL和调用DLL的应用程序引入,当被DLL引入Ӟ在DLL中定义_DLL_SAMPLE宏,q样׃在DLL模块中声明函Cؓ导出函数Q当被调用DLL的应用程序引入时Q就没有定义_DLL_SAMPLEQ这样就会声明头文g中的函数ZDLL中的导入函数?nbsp;
  
   W二U方法:模块定义文g是一个有着.def文g扩展名的文本文g。它被用于导Z个DLL的函敎ͼ和__declspec(dllexport)很相|但是.def文gq不是Microsoft定义的。一?def文g中只有两个必需的部分:LIBRARY ?EXPORTS?
LIBRARY DLLSample
DESCRIPTION 
"my simple DLL"
EXPORTS
        TestDLL @
1  Q@1表示q是W一个导出函?br>
   W一行,''LIBRARY''是一个必需的部分。它告诉链接器(linkerQ如何命名你的DLL。下面被标识?'DESCRIPTION''的部分ƈ不是必需的。该语句字W串写入 .rdata 节,它告诉h们谁可能使用q个DLLQ这个DLL做什么或它ؓ了什么(存在Q。再下面的部分标识ؓ''EXPORTS''是另一个必需的部分;q个部分使得该函数可以被其它应用E序讉K到ƈ且它创徏一个导入库。当你生成这个项目时Q不仅是一?dll文g被创建,而且一个文件扩展名?lib的导出库也被创徏了。除了前面的部分以外Q这里还有其它四个部分标识ؓQNAME, STACKSIZE, SECTIONS, ?VERSION。另外,一个分?;)开始一个注解,如同''//''在C++中一栗定义了q个文g之后Q头文g中的__declspec(dllexport)׃需要声明了?br>
   三、编写DllMain函数和导出函?br>   DllMain函数是DLL模块的默认入口点。当Windows加蝲DLL模块时调用这一函数。系l首先调用全局对象的构造函敎ͼ然后调用全局函数DLLMain。DLLMain函数不仅在将DLL链接加蝲到进E时被调用,在DLL模块与进E分LQ以及其它时候)也被调用?
#include "stdafx.h"
#define _DLL_SAMPLE

#ifndef _DLL_SAMPLE_H
#include 
"DLLSample.h"
#endif

#include 
"stdio.h"

//APIENTRY声明DLL函数入口?/span>
BOOL APIENTRY DllMain(HANDLE hModule, DWORD ul_reason_for_call, LPVOID lpReserved)
{
 
switch (ul_reason_for_call)
 
{
  
case DLL_PROCESS_ATTACH:
  
case DLL_THREAD_ATTACH:
  
case DLL_THREAD_DETACH:
  
case DLL_PROCESS_DETACH:
   
break;
 }

 
return TRUE;
}


void TestDLL(int arg)
{
  printf(
"DLL output arg %d\n", arg);
}
   如果E序员没有ؓDLL模块~写一个DLLMain函数Q系l会从其它运行库中引入一个不做Q何操作的~省DLLMain函数版本。在单个U程启动和终止时QDLLMain函数也被调用?br>   然后QF7~译Q就得到一个DLL了?br>   

Saga 2009-07-20 13:49 发表评论
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Windows消息机制概述http://www.shnenglu.com/suiaiguo/archive/2009/07/18/90412.htmlSagaSagaSat, 18 Jul 2009 02:50:00 GMThttp://www.shnenglu.com/suiaiguo/archive/2009/07/18/90412.htmlhttp://www.shnenglu.com/suiaiguo/comments/90412.htmlhttp://www.shnenglu.com/suiaiguo/archive/2009/07/18/90412.html#Feedback0http://www.shnenglu.com/suiaiguo/comments/commentRss/90412.htmlhttp://www.shnenglu.com/suiaiguo/services/trackbacks/90412.html阅读全文

Saga 2009-07-18 10:50 发表评论
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