将字符串URL编码

int URLEncode( const CString& rawStr,CString& encodeStr )
{
#ifdef _UNICODE
    std::string strPre = wstring2string((LPCTSTR)rawStr).c_str();
    std::string strEncoded;
    char*   szHexTable = "0123456789ABCDEF",
        *    szUnsafeTable = ""<>%\^[]`+$,@:;/!#?=&" ;
    for (int i=0 ; i < strPre.size(); i++){
        if (((unsigned char)strPre[i] > 32) && ((unsigned char)strPre[i] < 123) && ( strchr(szUnsafeTable,(unsigned char)strPre[i])== NULL )){
            strEncoded += (unsigned char)strPre[i] ;
        }
        else{
            strEncoded += "%" ;
            strEncoded += szHexTable[(unsigned char)strPre[i] / 16] ;
            strEncoded += szHexTable[(unsigned char)strPre[i] % 16] ;
        }
    }

    encodeStr = string2wstring(strEncoded).c_str();
    return encodeStr.GetLength() ;
#else
    ASSERT(FALSE);
#endif

}

只是简略实现，不确定@等符号是否需要转码。