WINDOWS下的ANSI字符串和UTF8字符串之间的相互转换

//CP_ACP=ANSI,CP_UTF8=utf-8
CString CXXXApp::UTF8Convert(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,NULL,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;
}

这段代码的出处忘记是哪了。修改了一下，可以使用