CString   Convert(CString   str,   int   sourceCodepage,   int   targetCodepage)
{
int   len=str.GetLength();

int   unicodeLen=MultiByteToWideChar(sourceCodepage,0,str,-1,NULL,0);

wchar_t *   pUnicode;
pUnicode=new   wchar_t[unicodeLen+1];

memset(pUnicode,0,(unicodeLen+1)*sizeof(wchar_t));


MultiByteToWideChar(sourceCodepage,0,str,-1,(LPWSTR)pUnicode,unicodeLen);

BYTE   *   pTargetData;
int   targetLen=WideCharToMultiByte(targetCodepage,0,(LPWSTR)pUnicode,-1,(char   *)pTargetData,0,NULL,NULL);

pTargetData=new   BYTE[targetLen+1];
memset(pTargetData,0,targetLen+1);

WideCharToMultiByte(targetCodepage,0,(LPWSTR)pUnicode,-1,(char   *)pTargetData,targetLen,NULL,NULL);

CString   rt;
rt.Format( "%s ",pTargetData);

delete   pUnicode;
delete   pTargetData;
return   rt;

}
用法
Convert(str,CP_UTF8,936);