在c＃中找到gsm調制解調器端口＃

Question

我想遍歷可用端口： System.IO.Ports.SerialPort.GetPortNames（） 查找gsm調制解調器是否使用端口。 請任何想法。

Answer 1

我在程序做了什麼了一個類似的任務：

1. 要檢查調制解調器連接到特定的端口，你可以發送AT命令到該端口。下面 這個功能，如果我們找到了一個調制解調器當前的COM端口返回true：

   private bool CheckExistingModemOnComPort(SerialPort serialPort) 
   { 
       if ((serialPort == null) || !serialPort.IsOpen) 
        return false; 
   
       // Commands for modem checking 
       string[] modemCommands = new string[] { "AT",  // Check connected modem. After 'AT' command some modems autobaud their speed. 
                 "ATQ0" }; // Switch on confirmations 
       serialPort.DtrEnable = true; // Set Data Terminal Ready (DTR) signal 
       serialPort.RtsEnable = true; // Set Request to Send (RTS) signal 
   
       string answer = ""; 
       bool retOk = false; 
       for (int rtsInd = 0; rtsInd < 2; rtsInd++) 
       { 
        foreach (string command in modemCommands) 
        { 
         serialPort.Write(command + serialPort.NewLine); 
         retOk = false; 
         answer = ""; 
         int timeout = (command == "AT") ? 10 : 20; 
   
         // Waiting for response 1-2 sec 
         for (int i = 0; i < timeout; i++) 
         { 
          Thread.Sleep(100); 
          answer += serialPort.ReadExisting(); 
          if (answer.IndexOf("OK") >= 0) 
          { 
           retOk = true; 
           break; 
          } 
         } 
        } 
        // If got responses, we found a modem 
        if (retOk) 
         return true; 
   
        // Trying to execute the commands without RTS 
        serialPort.RtsEnable = false; 
       } 
       return false; 
   } 
   

2. 在下一階段，我們可以從調制解調器收集一些數據。 我用下面的命令：

   • ATQ0 - 開關上確認（接收對每個請求OK）
   • ATE0 - 交換機上回聲
   • ATI - 獲得調制解調器細節
   • ATI3 - 獲得擴展調制解調器詳細信息（並非所有調制解調器都支持此命令）

Answer 2

   // Check each Availble COM port 
       foreach (string l_sport in l_available_ports) 
       { 
        GlobalVars.g_serialport = GlobalFunc.OpenPort(l_sport, Convert.ToInt32(this.cboBaudRate.Text), Convert.ToInt32(this.cboDataBits.Text), Convert.ToInt32(this.txtReadTimeOut.Text), Convert.ToInt32(this.txtWriteTimeOut.Text)); 
        if (GlobalVars.g_serialport.IsOpen) 
        { 
         GlobalVars.g_serialport.WriteLine("AT\r"); 
         Thread.Sleep(500); 
         string l_response = GlobalVars.g_serialport.ReadExisting(); 
         if (l_response.IndexOf("OK") >= 0) 
         { 
          GlobalVars.g_serialport.WriteLine("AT+CMGF=1\r"); 
          Thread.Sleep(500); 
          string l_response1 = GlobalVars.g_serialport.ReadExisting(); 
          if (l_response1.IndexOf("OK") >= 0) 
          { 
           GlobalVars.g_PhoneNo = txt_PhNum.Text; 
           MessageBox.Show("Connected Successfully", "Connection", MessageBoxButtons.OK, MessageBoxIcon.Information); 
           lblConnectionStatus.Text = "Phone Connected Successfully."; 
           btnOK.Enabled = false; 
           btnDisconnect.Enabled = true; 

           GlobalVars.g_serialport.WriteLine("AT+CGSN\r"); 
           Thread.Sleep(500); 
           string l_imei = GlobalVars.g_serialport.ReadExisting(); 
           Console.WriteLine("Modem IMEI:" + l_imei); 
           if (l_imei.IndexOf("OK", 1) > 0) 
           { 
            l_imei = l_imei.Replace("AT+CGSN\r\r\n", null); 
            l_imei = l_imei.Replace("\r\n\r\nOK\r\n", null); 
            lbl_ModemIMEI.Text = l_imei; 
           } 
           else 
           { 
            lblConnectionStatus.Text = "Phone Connected Successfully. Error reading IMEI."; 
           } 
           EnableSMSNotification(GlobalVars.g_serialport); 

           break; 
          } 
          else 
          { 
           Console.WriteLine("No AT+CMGF cmd response"); 
          } 
         } 
         else 
         { 
          Console.WriteLine("No AT cmd response"); 
         } 
        } 
        else 
        { 
         Console.WriteLine("No Phone At:" + l_sport); 
        } 
       }