字符串UTF-8与ASCII相互转换

LPSTR Convert(LPCSTR str, int sourceCodepage, int targetCodepage)
{
int len=_tcslen(str);
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);

LPSTR szResult=new TCHAR[targetLen+1];
wsprintf(szResult,"%s",pTargetData);

delete[] pUnicode;
delete[] pTargetData;
return szResult;
}

用法
编码
Convert(str,936,CP_UTF8);
解码
Convert(str,CP_UTF8,936);