MsXml创建和解析XML示例

一．MsXml创建XML文档示例
 // XmlCreationDemo.cpp
#include <stdlib.h>
#include <stdio.h>
// 引入MSXML解析器
#import <msxml4.dll>
using namespace MSXML2;
class InitializeCom
{
public:
InitializeCom() { CoInitialize(NULL); // Initializes the COM library }
~InitializeCom() { CoUninitialize(); // Closes the COM library }
}InitCom;
int main()
{
char *szXmlFile = "D:\\china.xml"; // xml文件
IXMLDOMDocumentPtr pDoc = NULL; // xml文档
IXMLDOMProcessingInstructionPtr pProInstruction = NULL; // xml声明
IXMLDOMCommentPtr pComment = NULL; // 注释
IXMLDOMElementPtr pRootElement = NULL, pElement = NULL; // 根节点(元素)
IXMLDOMNodePtr pNode = NULL, pNode1 = NULL, pNode2 = NULL; // 节点
IXMLDOMAttributePtr pAttrNode = NULL; // 属性
HRESULT hr = pDoc.CreateInstance(__uuidof(DOMDocument40)); //
if (FAILED(hr))
{
printf("无法创建DOMDocument40对象，请检查是否安装并初始化了MsXml Parser库！");
return EXIT_FAILURE;
}

// (1)创建xml文档声明(或insertBefore根节点)
pProInstruction = pDoc->createProcessingInstruction((_bstr_t)(char*)"xml", (_bstr_t)(char*)"version=\"1.0\" encoding=\"utf-8\"");
pDoc->appendChild((IXMLDOMNode*)pProInstruction);
// (2)创建根节点<China>
pRootElement = pDoc->createElement((_bstr_t)(char*)"China");
pDoc->PutRefdocumentElement(pRootElement); // pXMLDomDoc->documentElement = pRootElement;
// (3)创建节点<China><Continent>
pComment = pDoc->createComment((_bstr_t)(char*)"所在的洲");
pRootElement->appendChild((IXMLDOMNode*)pComment); // 注释

pNode = pDoc->createNode((_variant_t)(long)NODE_ELEMENT, (_bstr_t)(char*)"Continent", (_bstr_t)(char*)"");
pNode->Puttext((_bstr_t)(char*)"Asia"); // pNode->text = "Asia";
pRootElement->appendChild(pNode); // 节点
// (4)创建节点<China><Population>
pComment = pDoc->createComment((_bstr_t)(char*)"人口数量");
pRootElement->appendChild((IXMLDOMNode*)pComment); // 注