小编Sha*_*lam的帖子

我正在尝试通过gsm调制解调器运行usdd代码以获取sim卡余额。我正在使用GsmComm库，ASP.NET Web窗体，C＃。下面是我的代码：

    public string SendUssdRequest2(string request)
    {
        comm = ConnectAndGetComm();
        string data = TextDataConverter.StringTo7Bit(request);

        string msg = "";
        var asPDUencoded = Calc.IntToHex(TextDataConverter.SeptetsToOctetsInt(data));
        try
        {
            IProtocol protocol = comm.GetProtocol();
            string gottenString = protocol.ExecAndReceiveMultiple("AT+CUSD=1," + asPDUencoded + ",15");
            var re = new Regex("\".*?\"");
            int i = 0;
            if (!re.IsMatch(gottenString))
            {
                do
                {
                    protocol.Receive(out gottenString);
                    ++i;
                } while (!(i >= 5
                           || re.IsMatch(gottenString)
                           || gottenString.Contains("\r\nOK")
                           || gottenString.Contains("\r\nERROR")
                           || gottenString.Contains("\r\nDONE"))); 
            }

            string m = re.Match(gottenString).Value.Trim('"');
            return PduParts.Decode7BitText(Calc.HexToInt(m));
        }
        catch(Exception e)
        {
            msg = e.Message; …