在TinyXML中，根據(jù)XML的各種元素來定義了一些類：
TiXmlBase：整個(gè)TinyXML模型的基類。
TiXmlAttribute：對(duì)應(yīng)于XML中的元素的屬性。
TiXmlNode：對(duì)應(yīng)于DOM結(jié)構(gòu)中的節(jié)點(diǎn)。
TiXmlComment：對(duì)應(yīng)于XML中的注釋。
TiXmlDeclaration：對(duì)應(yīng)于XML中的申明部分，即<？versiong="1.0" ?>。
TiXmlDocument：對(duì)應(yīng)于XML的整個(gè)文檔。
TiXmlElement：對(duì)應(yīng)于XML的元素。
TiXmlText：對(duì)應(yīng)于XML的文字部分。
TiXmlUnknown：對(duì)應(yīng)于XML的未知部分。
TiXmlHandler：定義了針對(duì)XML的一些操作。
例如:
<?xml version="1.0" standalone=no>
<!– Our to do list data –>
<ToDo>
<Item priority="1"> Go to the <bold>Toy store!</bold></Item>
<Item priority="2"> Do bills</Item>
</ToDo>
整個(gè)對(duì)象樹：
TiXmlDocument "demo.xml"
TiXmlDeclaration "version=’1.0′" "standalone=no"
TiXmlComment " Our to do list data"
TiXmlElement "ToDo"
TiXmlElement "Item" Attribtutes: priority = 1
TiXmlText "Go to the "
TiXmlElement "bold"
TiXmlText "Toy store!"
TiXmlElement "Item" Attributes: priority=2
TiXmlText "Do bills"
在tinyXML中,用FirstChild（"名字"）查找節(jié)點(diǎn)時(shí),調(diào)用FirstChild函數(shù)的節(jié)點(diǎn)與要查找的節(jié)點(diǎn)必須成“父子關(guān)系”。
句柄
想要健壯地讀取一個(gè)XML文檔，檢查方法調(diào)用后的返回值是否為null是很重要的。一種安全的檢錯(cuò)實(shí)現(xiàn)可能會(huì)產(chǎn)生像這樣的代碼：
TiXmlElement* root = document.FirstChildElement( "Document" );
if ( root )
{
TiXmlElement* element = root->FirstChildElement( "Element" );
if ( element )
{
TiXmlElement* child = element->FirstChildElement( "Child" );
if ( child )
{
TiXmlElement* child2 = child->NextSiblingElement( "Child" );
if ( child2 )
{
// Finally do something useful.
用句柄的話就不會(huì)這么冗長了，使用TiXmlHandle類，前面的代碼就會(huì)變成這樣：
TiXmlHandle docHandle( &document );
TiXmlElement* child2 = docHandle.FirstChild( "Document" ).FirstChild( "Element" ).Child( "Child", 1 ).ToElement();
if ( child2 )
{
// do something useful
一、讀取XML,設(shè)置節(jié)點(diǎn)文本如下XML片段:
<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
<ZXML>
<ZAPP>
<VBS_RUNTIME_PARAMS>
<BROADCAST_VERSION info="版本">8</BROADCAST_VERSION>
<Broadcast>
<FileCount info="資源文件個(gè)數(shù)">69</FileCount>
<SOURCE_1>
<ID info="圖片編號(hào)">1</ID>
<Version info="圖片版本">1</Version>
<Path info="圖片路徑">/mnt/share/1.bmp</Path>
<FileMode info="文件處理模式">0</FileMode>
</SOURCE_1>
<SOURCE_2>
<Path info="圖片路徑">/mnt/share/2.bmp</Path>
<ID info="圖片編號(hào)">2</ID>
<Version info="圖片版本">1</Version>
<FileMode info="文件處理模式">0</FileMode>
</SOURCE_2>
.
</Broadcast>
</VBS_RUNTIME_PARAMS>
</ZAPP>
</ZXML>
要設(shè)置BROADCAST_VERSION節(jié)點(diǎn)的值 8為其他值,可參考如下代碼(將值加1):
用ReplaceChild( TiXmlNode* replaceThis, const TiXmlNode& withThis )方法替換
TiXmlDocument doc("zapp.conf");
doc.LoadFile();
TiXmlHandle docHandle( &doc );
TiXmlElement* Broadcast_ver = docHandle.FirstChild("ZXML").FirstChild("ZAPP").FirstChild("VBS_RUNTIME_PARAMS").FirstChildElement("BROADCAST_VERSION").ToElement();
TiXmlNode * oldnode = Broadcast_ver->FirstChild();
const char *ver = Broadcast_ver->GetText();
int oldVer = atoi(ver);
CString newVer;
newVer.Format("%d",oldVer+1);
TiXmlText newText(newVer);
Broadcast_ver->ReplaceChild(oldnode,newText);
AfxMessageBox(Broadcast_ver->GetText());//輸出值
doc.SaveFile();
二,刪除節(jié)點(diǎn),屬性值RemoveChild( TiXmlNode* removeThis )方法刪除父節(jié)點(diǎn)的子節(jié)點(diǎn),
RemoveAttribute( const char * name )方法刪除屬性值.
例如刪除BROADCAST_VERSION節(jié)點(diǎn)
TiXmlHandle docHandle( &doc );
TiXmlElement* Broadcast_ver = docHandle.FirstChild("ZXML").FirstChild("ZAPP").FirstChild("VBS_RUNTIME_PARAMS").ToElement();
TiXmlNode * node = Broadcast_ver->FirstChild("BROADCAST_VERSION");
Broadcast_ver->RemoveChild(node);
也可以刪除整個(gè)SOURCE_1節(jié)點(diǎn):
TiXmlHandle docHandle( &doc );
TiXmlElement* Broadcast = docHandle.FirstChild("ZXML").FirstChild("ZAPP").FirstChild("VBS_RUNTIME_PARAMS").FirstChild("Broadcast").ToElement();
TiXmlNode * node = Broadcast->FirstChild("SOURCE_1");
Broadcast->RemoveChild(node);
刪除BROADCAST_VERSION的info屬性:
TiXmlHandle docHandle( &doc );
TiXmlElement* Broadcast_ver = docHandle.FirstChild("ZXML").FirstChild("ZAPP").FirstChild("VBS_RUNTIME_PARAMS").FirstChildElement("BROADCAST_VERSION").ToElement();
Broadcast_ver->RemoveAttribute("info"); //刪除info
可以借助NextSiblingElement()方法實(shí)現(xiàn)遞歸刪除.
三,添加節(jié)點(diǎn),屬性值例如在SOURCE_3下添加BROADCAST_PID節(jié)點(diǎn):
TiXmlHandle docHandle( &doc );
TiXmlElement* Broadcast = docHandle.FirstChild("ZXML").FirstChild("ZAPP").FirstChild("VBS_RUNTIME_PARAMS").FirstChild("Broadcast").ToElement();
TiXmlElement* Broadcast_Pid = new TiXmlElement("BROADCAST_PID");
TiXmlText *text =new TiXmlText("7215");
Broadcast_Pid->SetAttribute("info","the pid");
Broadcast_Pid->LinkEndChild(text);
Broadcast->LinkEndChild(Broadcast_Pid);
將在SOURCE_3后添加新的節(jié)點(diǎn):
<BROADCAST_PID info="the pid">7215</BROADCAST_PID>
四,最后說一下中文亂碼的問題
亂碼是由于GB2312與UTF8之間轉(zhuǎn)換不當(dāng)造成的,tinyxml在處理UTF8本身沒有問題,當(dāng)你打開一個(gè)UTF8的文檔,可以在加載的時(shí)候指定UTF8的方式,或者文檔聲明處指明的編碼格式,tinyxml會(huì)按照相應(yīng)的編碼格式加載,但很多時(shí)候當(dāng)我們輸出或?qū)懭胫形淖侄螘r(shí)會(huì)出現(xiàn)亂碼,無論在內(nèi)存,還是打印出來的內(nèi)容.這是因?yàn)槲覀兊能浖ǔＪ荊B2312編碼,而讀取或?qū)懭氲膬?nèi)容是UTF8,自然就會(huì)出錯(cuò).可以借助網(wǎng)上的兩個(gè)函數(shù)來實(shí)現(xiàn)轉(zhuǎn)換(原作者不詳):
void ConvertUtf8ToGBK(CString& strUtf8)
{
int len=MultiByteToWideChar(CP_UTF8, 0, (LPCTSTR)strUtf8, -1, NULL,0);
unsigned short * wszGBK = new unsigned short[len+1];
memset(wszGBK, 0, len * 2 + 2);
MultiByteToWideChar(CP_UTF8, 0, (LPCTSTR)strUtf8, -1, wszGBK, len);
len = WideCharToMultiByte(CP_ACP, 0, wszGBK, -1, NULL, 0, NULL, NULL);
char *szGBK=new char[len + 1];
memset(szGBK, 0, len + 1);
WideCharToMultiByte (CP_ACP, 0, wszGBK, -1, szGBK, len, NULL,NULL);
strUtf8 = szGBK;
delete[] szGBK;
delete[] wszGBK;
}
void ConvertGBKToUtf8(CString& strGBK)
{
int len=MultiByteToWideChar(CP_ACP, 0, (LPCTSTR)strGBK, -1, NULL,0);
unsigned short * wszUtf8 = new unsigned short[len+1];
memset(wszUtf8, 0, len * 2 + 2);
MultiByteToWideChar(CP_ACP, 0, (LPCTSTR)strGBK, -1, wszUtf8, len);
len = WideCharToMultiByte(CP_UTF8, 0, wszUtf8, -1, NULL, 0, NULL, NULL);
char *szUtf8=new char[len + 1];
memset(szUtf8, 0, len + 1);
WideCharToMultiByte (CP_UTF8, 0, wszUtf8, -1, szUtf8, len, NULL,NULL);
strGBK = szUtf8;
delete[] szUtf8;
delete[] wszUtf8;
}
當(dāng)然,你也可以用MultiByteToWideChar,WideCharToMultiByte函數(shù)自己實(shí)現(xiàn)轉(zhuǎn)換.以上是簡單應(yīng)用的幾個(gè)舉例,理解他們,相信你已經(jīng)能寫出滿足自己需要的代碼了.