XML字符串的读写操作函数及示例程序

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　　xml|程序|函数|示例|字符串

// OpXML.cpp : Defines the entry point for the console application.
//

//----------------------- Coded By Ronk --------------------------//
//----------------------- 2005-07-17 --------------------------//

#include "stdafx.h"
#include <stdio.h>

//---You must Setup the MSXML4.0 before using
#import <msxml4.dll>
using namespace MSXML2;

void xmlread(char *ch1,char *ch2,char *ch3);//Read the xmlstr and Get the Text of the Element

void xmlupdate(char *ch1,char *ch2,char *ch3);//Read the xmlstr and Update the Text of the Element

int main(int argc, char* argv[])
{
char xmlstr[1024]="<inesmsg><msghead><version>LZD</version><root>ioio</root></msghead></inesmsg>";
char strele[1024]="//version//";
char textstr[1024]="NNYX";
char value[1024];

printf("The xmlstr is :\n%s\n\n",xmlstr);

xmlread(xmlstr,strele,value); //befor Update
printf("The Text of Element befor Update is: \n%s\n\n",value);

xmlupdate(xmlstr,strele,textstr);//Change the Text of "<version>" with "NNYX"
printf("The Updated xmlstr is :\n%s\n\n",xmlstr);

xmlread(xmlstr,strele,value);//after Update
printf("The Text of Element after Update is :\n%s\n\n",value);

return 0;
}

void xmlread(char* msgstr,char* elestr,char *tex)
{
//Initialize
CoInitialize(NULL);

IXMLDOMDocumentPtr pXmlDoc;
IXMLDOMNodePtr pXmlNode;

HRESULT hr;
hr = pXmlDoc.CreateInstance(__uuidof(DOMDocument));
if (FAILED(hr))
{
  printf("Faild to Create XMLDom Instance !");
  pXmlDoc=NULL;
}
else
{
  pXmlDoc ->async = VARIANT_FALSE;

  //Load xmlmsg
  _bstr_t xmlstr=(LPCSTR)msgstr;

  if (!(pXmlDoc->loadXML(msgstr)))
  {
   printf("Failed to Load xmlstr:\n%s\n",(LPCSTR)pXmlDoc->parseError->Getreason());
   pXmlDoc=NULL;
  }
  else
  {
   //Locate the Element
   _bstr_t str=(LPCSTR)elestr;
   pXmlNode = pXmlDoc ->selectSingleNode(elestr);

   if(FAILED(pXmlNode))
    printf("Faild to Locate the Element \n%s\n",str);
   else
   {
    //Read the Text of Element
    strcpy(tex,(LPCSTR)pXmlNode ->text);


    //Realese
    pXmlDoc.Release();
    pXmlNode.Release();
   }
  }
}
}

void xmlupdate(char *msgstr,char *elestr,char *upstr)
{
//---Initialize
CoInitialize(NULL);

IXMLDOMDocumentPtr pXmlDoc;
IXMLDOMNodePtr pXmlNode;

HRESULT hr;
hr = pXmlDoc.CreateInstance(__uuidof(DOMDocument));

if (FAILED(hr))
{
  printf("Faild to Create XMLDom Instance !");
  pXmlDoc=NULL;
}
else
{
  pXmlDoc ->async = VARIANT_FALSE;

  //Load xml str
  _bstr_t xmlstr=(LPCSTR)msgstr;

  if (!(pXmlDoc->loadXML(msgstr)))
  {
   printf("Failed to load xmlstr:\n%s\n",(LPCSTR)pXmlDoc->parseError->Getreason());
   pXmlDoc=NULL;
  }
  else
  {
   //Located the Element
   _bstr_t str=(LPCSTR)elestr;
   pXmlNode = pXmlDoc ->selectSingleNode(elestr);

   if (FAILED(pXmlNode))
    printf("Failed to Locate the Element \n%s\n",str);
   else
   {
    //Update the Text of the Element
    pXmlNode->text = upstr;

    //Get the New xmlstr
    strcpy(msgstr,(LPCSTR)pXmlDoc->xml);

    //Realese
    pXmlDoc.Release();
    pXmlNode.Release();
   }
  }
}
}