短信猫二次开发：AT指令发送短信示例与实现

        /*
         * 发送AT指令
         * */
        public string sendAT(SerialPort sp,string AT) {
            string striBuilder = string.Empty;
            sp.WriteLine(AT);
            int num = 0;
            Thread.Sleep(2000);
            num = sp.BytesToRead;
            for (int i = 0; i < num; i++)
            {
                char ch = (char)sp.ReadByte();
                striBuilder += ch.ToString();
            }
            return striBuilder;
        }

        /*
         * 发送短信
         * */
        public bool sendMessage(SerialPort sp, string centerNum,string targetNum,string message) {
            string strBuilder = string.Empty;
            string decodedSMS = pdu.smsDecodedsms(centerNum, targetNum, message);
            strBuilder=sendAT(sp,"AT+CMGF=0");
            if(strBuilder.Length>0&&strBuilder.Contains("OK")){
                strBuilder = sendAT(sp, "AT+CMGS=" + pdu.nLength);
                if (strBuilder.Length > 0 && strBuilder.EndsWith("> "))
                {
                        strBuilder = sendAT(sp, String.Format("{0}\x01a", decodedSMS));
                        if (strBuilder.Length > 0)