write to TinyXML

#include "tinyxml.h"#include "tinystr.h"#include <string>int main(){TiXmlDocument *pDoc;TiXmlElement *pRootElem;int num = 0;std::string m_FileName = "123.xml";pDoc = new TiXmlDocument(m_FileName.c_str());if (NULL == pDoc){throw std::runtime_error("TiXmlDocument can't be opened!");}TiXmlDeclaration decl(("1.0"), ("gb2312"), ("yes"));  pDoc->LinkEndChild(&decl);pRootElem = new TiXmlElement(("Messages"));if (NULL == pRootElem){throw std::runtime_error("pRootElem can't be opened!");}pDoc->LinkEndChild(pRootElem);for (;num < 10;){TiXmlElement *pMessageElement = new TiXmlElement("Message");if (NULL == pMessageElement){throw std::runtime_error("pMessageElement can't be opened!");}TiXmlElement *pMessageLenElement = new TiXmlElement("MessageLen");if (NULL == pMessageLenElement){throw std::runtime_error("pMessageLenElement can't be opened!");}TiXmlElement *pMessageContentElement = new TiXmlElement("MessageContent");if (NULL == pMessageContentElement){throw std::runtime_error("pMessageContentElement can't be opened!");}pMessageElement->SetAttribute("ID",++num); pRootElem->LinkEndChild(pMessageElement);pMessageElement->LinkEndChild(pMessageLenElement);pMessageElement->LinkEndChild(pMessageContentElement);TiXmlText *MessageLength = new TiXmlText("11");if (NULL == MessageLength){throw std::runtime_error("MessageLength can't be opened!");}//std::string lStr(str,len);TiXmlText *MessageContent = new TiXmlText("22");if (NULL == MessageContent){throw std::runtime_error("MessageContent can't be opened!");}pMessageLenElement->LinkEndChild(MessageLength);pMessageContentElement->LinkEndChild(MessageContent);}pDoc->SaveFile();}