在c＃中查找gsm调制解调器端口
我想遍历可用的端口：System.IO.Ports.SerialPort.GetPortNames（）以查找gsm调制解调器是否使用了一个端口。 请问任何想法。
我在申请中做了一项类似的任务：
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要检查调制解调器是否连接到特定端口，您可以将AT命令发送到此端口。 如果我们在当前COM端口上找到调制解调器，则此函数返回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; } -
在下一阶段，我们可以从调制解调器收集一些数据。 我使用了以下命令：
- ATQ0 – 打开确认（每次请求都收到OK）
- ATE0 – 打开回声
- ATI – 获取调制解调器详细信息
- ATI3 – 获取扩展调制解调器详细信息（并非所有调制解调器都支持此命令）
// 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); } }