GB2312转UTF8示例程序

最新推荐文章于 2025-06-03 13:43:10 发布

原创最新推荐文章于 2025-06-03 13:43:10 发布 · 858 阅读

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本文介绍了一个用于将GB2312编码的字符串转换为UTF-8编码的实用函数，并展示了如何从XML文件中读取内容并进行编码转换的过程。

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#include <Windows.h>
#include <stdio.h>
#include <string>

bool GB2312ToUTF8(const char *pGb2312,std::string &strUtf8)
{
   //GB2312 to unicode
   int nUniCodeLen = MultiByteToWideChar(CP_ACP,0,pGb2312,-1,NULL,0);
   wchar_t *pcUnicode = new wchar_t[nUniCodeLen + 1];
   memset(pcUnicode,0,nUniCodeLen * 2 +2);

MultiByteToWideChar(CP_ACP,0,pGb2312,-1,pcUnicode,nUniCodeLen);

//unicode to utf8
int nUtf8Len = WideCharToMultiByte(CP_UTF8,0,pcUnicode,-1,NULL,0,NULL,NULL);
char *pcUtf8 = new char[nUtf8Len + 1];
memset(pcUtf8,0,nUtf8Len +1 );
WideCharToMultiByte(CP_UTF8,0,pcUnicode,-1,pcUtf8,nUtf8Len,NULL,NULL);
strUtf8 = pcUtf8;
delete []pcUtf8;
delete []pcUnicode;
return true;
}

std::string getContentsFromXmlFile(std::string &fileName)
{
FILE *fp = NULL;
if((fp = fopen(fileName.c_str(),"rb")) == NULL)
{
  printf("file: %s open error ! ",fileName.c_str());
  std::string sTmp;
  return sTmp;
}
fseek(fp,0,SEEK_SET);
fseek(fp,0,SEEK_END);
int fileSize = ftell(fp) + 1;
if(!(fileSize - 1 > 5))
{
  std::string temp("");
  fclose(fp);
  return temp;
}
char *pchBuffer = new char[fileSize];
fseek(fp,0,SEEK_SET);
memset(pchBuffer,0,fileSize);
fread(pchBuffer,fileSize,1,fp);
pchBuffer[fileSize - 1] = '\0';
std::string fileContent(pchBuffer);

if(pchBuffer != NULL)
{
delete []pchBuffer;
pchBuffer = NULL;
}
fclose(fp);
return fileContent;
}

std::string getContentsFromXmlFile(const char *filename)
{
std::string strFileName(filename);
return getContentsFromXmlFile(strFileName);
}

int main(int argc,char **argv)
{
std::string strXmlContent = getContentsFromXmlFile("fileName.xml");
std::string strResult;
GB2312ToUTF8(strXmlContent.c_str(),strResult);
FILE *fp = fopen("result.xml","ab");
fwrite(strResult.c_str(),strResult.length(),1,fp);
fclose(fp);

return 0;
}