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