url编码（utf-8)

CString CExonDlg::UrlEncxode(CString strUnicode)
{
LPCWSTR unicode = T2CW(strUnicode);
int len = WideCharToMultiByte(CP_UTF8, 0, unicode, -1, 0, 0, 0, 0);
if (!len)
return strUnicode;
char *utf8 = new char[len + 1];
char *utf8temp = utf8;
WideCharToMultiByte(CP_UTF8, 0, unicode, -1, utf8, len + 1, 0, 0);
utf8[len] = NULL;   
CString strTemp, strEncodeData; 
while(*utf8!=NULL){ 
strTemp.Format(_T("%%%2x"), (BYTE)*utf8); 
strEncodeData += strTemp; 
++utf8; 
}
delete []utf8temp;
return CString(strEncodeData);

}

在mfc中我们常用的是，cstring

cstring和cstringA的转换是：

Csting=str;

CstingA  jfd(str)