首先要清楚XML文件包含哪些元素：

他是由元素、文本或者两者混合物组成。元素可以拥有属性，元素是指从开始标签到结束标签的部分。

<?xml version="1.0" encoding="UTF-8" ?>
<books><book id="1001"><name>面纱</name><info>请记住我，虽然再见必须说</info></book><book id="1002"><name>人生第一次</name><info>愿他们、我们的一生平淡而有意义</info></book>
</books> 

开始操作

1.在网上下载到tinnyxml的源码

 2.导入tinyxml的头文件

#include "./TinyXML/tinyxml.h"

解析方法：

QString XMLreadwrite::parseIPAddress() const
{QList<QString> nodeList;nodeList.append("net");nodeList.append("fix_ip");QString attrText = "ip";TiXmlNode *pNode = (TiXmlNode*)FindTextNode(nodeList);QString data = ParseNodeData(pNode, attrText);return data;
}

修改方法：

void XMLreadwrite::ModifyNodeData(TiXmlNode *pNode, QString text, QString data) const
{for(pNode = pNode->FirstChild();pNode;pNode = pNode->NextSibling()){if(QString(QLatin1String(pNode->Value())) == text){qDebug()<<"......."<<text<<data;const char cData[1024] = {0};memcpy((void*)cData,data.toStdString().c_str(),data.size());//首先清除所有文本pNode->Clear();//然后插入文本TiXmlText  *pValue = new TiXmlText(cData);pNode->LinkEndChild(pValue);qDebug()<<"Modified successfully"<<QString(QLatin1String(pNode->ToElement()->GetText()));}}
}

解析例子：

QString XMLreadwrite::parseCodeFormat() const
{QList<QString> nodeList;nodeList.append("param_video");QString attrText = "attr_format";TiXmlNode *pNode = (TiXmlNode*)FindTextNode(nodeList);QString nodeAttr = QString(QLatin1String(pNode->ToElement()->Attribute("name")));QString data = "";if(nodeAttr == "Visible"){data = ParseNodeData(pNode, attrText);}return data;
}

修改例子：

void XMLreadwrite::modifyCodeFormat(QString data)
{QList<QString> nodeList;nodeList.append("param_video");QString attrText = "attr_format";TiXmlNode *pNode = (TiXmlNode*)FindTextNode(nodeList);QString nodeAttr = QString(QLatin1String(pNode->ToElement()->Attribute("name")));if(nodeAttr == "Visible"){ModifyNodeData(pNode, attrText, data);}
}