救命啊！SerialPort问题

Question

   private void btnATCommand_Click(object sender, EventArgs e)//发送AT指令
        {
            if (txtATCommand.Text == "")
            {
                txtMsg.AppendText("\r\nAT指令为空!");
                return;
            }
            if (!sp.IsConnect())
            {
                txtMsg.AppendText("\r\n串口打开失败!");
                return;
            }
            string result = sp.ExeATCommand(delspace(txtATCommand.Text));
            if (result != "")
            {
                txtMsg.AppendText("\r\n"+result);
            }
            sp.Close();
        }
 public bool IsConnect()
        {
            bool opened = IsOpen();
            bool isScc;
            isScc = false;            if (opened)
            {
                readBuffer = ExeATCommand("AT\r");
                if (readBuffer.IndexOf("OK") != -1)
                {
                    isScc = true;
                }                if (IsListen == false)
                {
                    Close();
                }
            }            if (isScc)
            {
                return true;
            }
            else
            {
                return false;
            }        }private bool IsOpen()
        {
            try
            {
                if (!s_port.IsOpen)
                {
                    s_port.Open();
                }
                Opened = s_port.IsOpen;
                SetPDU();
                return true;
            }
            catch (Exception)
            {
                return false;
            }
        }
     
      
 
       /// <summary>
        /// 设置短信PDU方式
        /// </summary>
        private void SetPDU()
        {
            ExeATCommand("AT+CMGF=0\r");
        }
       /// <summary>
        /// 执行AT命令
        /// </summary>
        /// <param name="p_ATCommand">命令</param>
        /// <returns>结果字符串</returns>
        public string ExeATCommand(string p_ATCommand)
        {
           string result = string.Empty; // 返回结果内容
            int SendCommandCount = 0; // 重试次数
            if (p_ATCommand != string.Empty && s_port.IsOpen == true)
            {
                s_port.Write(p_ATCommand); // 输出命令到串口
                System.Threading.Thread.Sleep(retryTimeOut); // 延迟指定时间
                while (SendCommandCount <= retryCount)
                {
                    // 没有达到重试次数时，始终执行
                    System.Threading.Thread.Sleep(retryTimeOut); // 延迟指定时间
                    result += s_port.ReadExisting(); // 读取结果
                    if (result.Length > 0 && result.Length > p_ATCommand.Length)
                    {
                        result = result.Replace(p_ATCommand + "\r\r\n", string.Empty); // 去掉发送过来的命令，关心结果
                        break;
                    }
                    SendCommandCount++;
                }
            }
            return result;
        }
我单步调试时发现，设置PDU格式的时候，不论是0或1,返回的都是error,请大家帮帮忙！

Answer 1

private void btnATCommand_Click(object sender, EventArgs e)//发送AT指令 
        { 
            if (txtATCommand.Text == "") 
            { 
                txtMsg.AppendText("\r\nAT指令为空!"); 
                return; 
            } 
            if (!sp.IsConnect()) 
            { 
                txtMsg.AppendText("\r\n串口打开失败!"); 
                return; 
            } 
            string result = sp.ExeATCommand(delspace(txtATCommand.Text)); 
            if (result != "") 
            { 
                txtMsg.AppendText("\r\n"+result); 
            } 
            sp.Close(); 
        } 
public bool IsConnect() 
        { 
            bool opened = IsOpen(); 
            bool isScc; 
            isScc = false;             if (opened) 
            { 
                readBuffer = ExeATCommand("AT\r"); 
                if (readBuffer.IndexOf("OK") != -1) 
                { 
                    isScc = true; 
                }                 if (IsListen == false) 
                { 
                    Close(); 
                } 
            }             if (isScc) 
            { 
                return true; 
            } 
            else 
            { 
                return false; 
            }         } private bool IsOpen() 
        { 
            try 
            { 
                if (!s_port.IsOpen) 
                { 
                    s_port.Open(); 
                } 
                Opened = s_port.IsOpen; 
                SetPDU(); 
                return true; 
            } 
            catch (Exception) 
            { 
                return false; 
            } 
        } 
    
            /// <summary> 
        /// 设置短信PDU方式 
        /// </summary> 
        private void SetPDU() 
        { 
            ExeATCommand("AT+CMGF=0\r"); 
        } 
      /// <summary> 
        /// 执行AT命令 
        /// </summary> 
        /// <param name="p_ATCommand">命令 </param> 
        /// <returns>结果字符串 </returns> 
        public string ExeATCommand(string p_ATCommand) 
        { 
          string result = string.Empty; // 返回结果内容 
            int SendCommandCount = 0; // 重试次数 
            if (p_ATCommand != string.Empty && s_port.IsOpen == true) 
            { 
                s_port.Write(p_ATCommand); // 输出命令到串口 
                System.Threading.Thread.Sleep(retryTimeOut); // 延迟指定时间 
                while (SendCommandCount <= retryCount) 
                { 
                    // 没有达到重试次数时，始终执行 
                    System.Threading.Thread.Sleep(retryTimeOut); // 延迟指定时间 
                    result += s_port.ReadExisting(); // 读取结果 
                    if (result.Length > 0 && result.Length > p_ATCommand.Length) 
                    { 
                        result = result.Replace(p_ATCommand + "\r\r\n", string.Empty); // 去掉发送过来的命令，关心结果 
                        break; 
                    } 
                    SendCommandCount++; 
                } 
            } 
            return result; 
        } 
我单步调试时发现，设置PDU格式的时候，不论是0或1,返回的都是error,请大家帮帮忙！这样好读一些！

Answer 2

你的SIM卡可能有密码，Modem还没有完全初始化

Answer 3

这个问题已经解决了，现在的问题是，输入AT+CSCA？获取短信中心号码的，返回的是error,在超级终端下试，也是error,不知道是不是我的硬件设备的问题呢？请高手指教了！

Answer 4

我获取不到短信中心号码,后来就把短信中心号码写死了,我也知道这样不好,换个地方就不行了,以为这样就能发送成功了,可问题又来了,我输入AT+CNMI=?返回error,输入atd,返回no carrier,不知道什么原因,请高手把邮箱留下，我把程序发给你，请有空帮忙看看！不胜感激了！