在TinyXML中,根据XML的各种元素来定义了一些类:
TiXmlBase:整个TinyXML模型的基类。
TiXmlAttribute:对应于XML中的元素的属性。
TiXmlNode:对应于DOM结构中的节点。
TiXmlComment:对应于XML中的注释。
TiXmlDeclaration:对应于XML中的申明部分,即<?versiong="1.0" ?>。
TiXmlDocument:对应于XML的整个文档。
TiXmlElement:对应于XML的元素。
TiXmlText:对应于XML的文字部分。
TiXmlUnknown:对应于XML的未知部分。
TiXmlHandler:定义了针对XML的一些操作。
例如:
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
<? xml version="1.0" standalone=no>
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
<!– Our to do list data –>
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
<ToDo>
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
<Item priority="1"> Go to the <bold>Toy store!</bold></Item>
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
<Item priority="2"> Do bills</Item>
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
</ToDo>
整个对象树:
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")查找节点时,调用FirstChild函数的节点与要查找的节点必须成“父子关系”。
句柄
想要健壮地读取一个XML文档,检查方法调用后的返回值是否为null是很重要的。一种安全的检错实现可能会产生像这样的代码:
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
TiXmlElement* root = document.FirstChildElement( "Document" );
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
if ( root )
![](http://www.cppblog.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
{
![](http://www.cppblog.com/Images/OutliningIndicators/InBlock.gif)
TiXmlElement* element = root->FirstChildElement( "Element" );
![](http://www.cppblog.com/Images/OutliningIndicators/InBlock.gif)
if ( element )
![](http://www.cppblog.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
![](http://www.cppblog.com/Images/OutliningIndicators/InBlock.gif)
TiXmlElement* child = element->FirstChildElement( "Child" );
![](http://www.cppblog.com/Images/OutliningIndicators/InBlock.gif)
if ( child )
![](http://www.cppblog.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
![](http://www.cppblog.com/Images/OutliningIndicators/InBlock.gif)
TiXmlElement* child2 = child->NextSiblingElement( "Child" );
![](http://www.cppblog.com/Images/OutliningIndicators/InBlock.gif)
if ( child2 )
![](http://www.cppblog.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
{
![](http://www.cppblog.com/Images/OutliningIndicators/InBlock.gif)
// Finally do something useful.
用句柄的话就不会这么冗长了,使用TiXmlHandle类,前面的代码就会变成这样:
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
TiXmlHandle docHandle( &document );
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
TiXmlElement* child2 = docHandle.FirstChild( "Document" ).FirstChild( "Element" ).Child( "Child", 1 ).ToElement();
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
if ( child2 )
![](http://www.cppblog.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
{
![](http://www.cppblog.com/Images/OutliningIndicators/InBlock.gif)
// do something useful
一、读取XML,设置节点文本
如下XML片段:
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
<? xml version="1.0" encoding="UTF-8" standalone="yes" ?>
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
< ZXML >
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
< ZAPP >
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
< VBS_RUNTIME_PARAMS >
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
< BROADCAST_VERSION info ="版本" >8 </ BROADCAST_VERSION >
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
< Broadcast >
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
< FileCount info ="资源文件个数" >69 </ FileCount >
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
< SOURCE_1 >
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
< ID info ="图片编号" >1 </ ID >
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
< Version info ="图片版本" >1 </ Version >
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
< Path info ="图片路径" >/mnt/share/1.bmp </ Path >
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
< FileMode info ="文件处理模式" >0 </ FileMode >
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
</ SOURCE_1 >
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
< SOURCE_2 >
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
< Path info ="图片路径" >/mnt/share/2.bmp </ Path >
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
< ID info ="图片编号" >2 </ ID >
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
< Version info ="图片版本" >1 </ Version >
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
< FileMode info ="文件处理模式" >0 </ FileMode >
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
</ SOURCE_2 >
![](http://www.cppblog.com/Images/dot.gif)
.
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
</ Broadcast >
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
</ VBS_RUNTIME_PARAMS >
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
</ ZAPP >
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
</ ZXML >
要设置BROADCAST_VERSION节点的值 8为其他值,可参考如下代码(将值加1):
用ReplaceChild( TiXmlNode* replaceThis, const TiXmlNode& withThis )方法替换
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
TiXmlDocument doc("zapp.conf");
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
doc.LoadFile();
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
TiXmlHandle docHandle( &doc );
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
TiXmlElement* Broadcast_ver = docHandle.FirstChild("ZXML").FirstChild("ZAPP").FirstChild("VBS_RUNTIME_PARAMS").FirstChildElement("BROADCAST_VERSION").ToElement();
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
TiXmlNode * oldnode = Broadcast_ver->FirstChild();
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
const char *ver = Broadcast_ver->GetText();
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
int oldVer = atoi(ver);
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
CString newVer;
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
newVer.Format("%d",oldVer+1);
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
TiXmlText newText(newVer);
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
Broadcast_ver->ReplaceChild(oldnode,newText);
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
AfxMessageBox(Broadcast_ver->GetText()); // 输出值
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
doc.SaveFile();
二,删除节点,属性值
RemoveChild( TiXmlNode* removeThis )方法删除父节点的子节点,
RemoveAttribute( const char * name )方法删除属性值.
例如删除BROADCAST_VERSION节点
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
TiXmlHandle docHandle( &doc );
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
TiXmlElement* Broadcast_ver = docHandle.FirstChild("ZXML").FirstChild("ZAPP").FirstChild("VBS_RUNTIME_PARAMS").ToElement();
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
TiXmlNode * node = Broadcast_ver->FirstChild("BROADCAST_VERSION");
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
Broadcast_ver->RemoveChild(node);
也可以删除整个SOURCE_1节点:
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
TiXmlHandle docHandle( &doc );
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
TiXmlElement* Broadcast = docHandle.FirstChild("ZXML").FirstChild("ZAPP").FirstChild("VBS_RUNTIME_PARAMS").FirstChild("Broadcast").ToElement();
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
TiXmlNode * node = Broadcast->FirstChild("SOURCE_1");
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
Broadcast->RemoveChild(node);
删除BROADCAST_VERSION的info属性:
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
TiXmlHandle docHandle( &doc );
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
TiXmlElement* Broadcast_ver = docHandle.FirstChild("ZXML").FirstChild("ZAPP").FirstChild("VBS_RUNTIME_PARAMS").FirstChildElement("BROADCAST_VERSION").ToElement();
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
Broadcast_ver->RemoveAttribute("info"); // 删除info
可以借助NextSiblingElement()方法实现递归删除.
三,添加节点,属性值
例如在SOURCE_3下添加BROADCAST_PID节点:
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
TiXmlHandle docHandle( &doc );
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
TiXmlElement* Broadcast = docHandle.FirstChild("ZXML").FirstChild("ZAPP").FirstChild("VBS_RUNTIME_PARAMS").FirstChild("Broadcast").ToElement();
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
TiXmlElement* Broadcast_Pid = new TiXmlElement("BROADCAST_PID");
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
TiXmlText *text = new TiXmlText("7215");
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
Broadcast_Pid->SetAttribute("info","the pid");
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
Broadcast_Pid->LinkEndChild(text);
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
Broadcast->LinkEndChild(Broadcast_Pid);
将在SOURCE_3后添加新的节点:
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
< BROADCAST_PID info ="the pid" >7215 </ BROADCAST_PID >
四,最后说一下中文乱码的问题
乱码是由于GB2312与UTF8之间转换不当造成的,tinyxml在处理UTF8本身没有问题,当你打开一个UTF8的文档,可以在加载的时候指定UTF8的方式,或者文档声明处指明的编码格式,tinyxml会按照相应的编码格式加载,但很多时候当我们输出或写入中文字段时会出现乱码,无论在内存,还是打印出来的内容.这是因为我们的软件通常是GB2312编码,而读取或写入的内容是UTF8,自然就会出错.可以借助网上的两个函数来实现转换(原作者不详):
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
void ConvertUtf8ToGBK(CString& strUtf8)
![](http://www.cppblog.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
{
![](http://www.cppblog.com/Images/OutliningIndicators/InBlock.gif)
int len=MultiByteToWideChar(CP_UTF8, 0, (LPCTSTR)strUtf8, -1, NULL,0);
![](http://www.cppblog.com/Images/OutliningIndicators/InBlock.gif)
unsigned short * wszGBK = new unsigned short[len+1];
![](http://www.cppblog.com/Images/OutliningIndicators/InBlock.gif)
memset(wszGBK, 0, len * 2 + 2);
![](http://www.cppblog.com/Images/OutliningIndicators/InBlock.gif)
MultiByteToWideChar(CP_UTF8, 0, (LPCTSTR)strUtf8, -1, wszGBK, len);
![](http://www.cppblog.com/Images/OutliningIndicators/InBlock.gif)
len = WideCharToMultiByte(CP_ACP, 0, wszGBK, -1, NULL, 0, NULL, NULL);
![](http://www.cppblog.com/Images/OutliningIndicators/InBlock.gif)
char *szGBK=new char[len + 1];
![](http://www.cppblog.com/Images/OutliningIndicators/InBlock.gif)
memset(szGBK, 0, len + 1);
![](http://www.cppblog.com/Images/OutliningIndicators/InBlock.gif)
WideCharToMultiByte (CP_ACP, 0, wszGBK, -1, szGBK, len, NULL,NULL);
![](http://www.cppblog.com/Images/OutliningIndicators/InBlock.gif)
strUtf8 = szGBK;
![](http://www.cppblog.com/Images/OutliningIndicators/InBlock.gif)
delete[] szGBK;
![](http://www.cppblog.com/Images/OutliningIndicators/InBlock.gif)
delete[] wszGBK;
![](http://www.cppblog.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
}
![](http://www.cppblog.com/Images/OutliningIndicators/None.gif)
void ConvertGBKToUtf8(CString& strGBK)
![](http://www.cppblog.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
{
![](http://www.cppblog.com/Images/OutliningIndicators/InBlock.gif)
int len=MultiByteToWideChar(CP_ACP, 0, (LPCTSTR)strGBK, -1, NULL,0);
![](http://www.cppblog.com/Images/OutliningIndicators/InBlock.gif)
unsigned short * wszUtf8 = new unsigned short[len+1];
![](http://www.cppblog.com/Images/OutliningIndicators/InBlock.gif)
memset(wszUtf8, 0, len * 2 + 2);
![](http://www.cppblog.com/Images/OutliningIndicators/InBlock.gif)
MultiByteToWideChar(CP_ACP, 0, (LPCTSTR)strGBK, -1, wszUtf8, len);
![](http://www.cppblog.com/Images/OutliningIndicators/InBlock.gif)
len = WideCharToMultiByte(CP_UTF8, 0, wszUtf8, -1, NULL, 0, NULL, NULL);
![](http://www.cppblog.com/Images/OutliningIndicators/InBlock.gif)
char *szUtf8=new char[len + 1];
![](http://www.cppblog.com/Images/OutliningIndicators/InBlock.gif)
memset(szUtf8, 0, len + 1);
![](http://www.cppblog.com/Images/OutliningIndicators/InBlock.gif)
WideCharToMultiByte (CP_UTF8, 0, wszUtf8, -1, szUtf8, len, NULL,NULL);
![](http://www.cppblog.com/Images/OutliningIndicators/InBlock.gif)
strGBK = szUtf8;
![](http://www.cppblog.com/Images/OutliningIndicators/InBlock.gif)
delete[] szUtf8;
![](http://www.cppblog.com/Images/OutliningIndicators/InBlock.gif)
delete[] wszUtf8;
![](http://www.cppblog.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
}
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