Retreive First Enabled Modem Device Using .Net System.Management

本文链接：https://blog.youkuaiyun.com/iqueen/article/details/5207955

本文介绍了一种通过编程方式检索连接到计算机上的首个启用状态的调制解调器设备的方法。利用WMI（Windows Management Instrumentation）查询，可以确定正确的COM端口及最大波特率，以便进一步发送AT命令。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

In case we want to send some AT Command to the first workable mobile device connected to the computer, normally we start the 'devmgmt.msc' to find out which COM port is the right port, but if there is a programming way to do that?

The following is the code to retrieve the first 'Enabled' modem device,

private void FindFirstEnabledComDevice() { ManagementObjectSearcher query = new ManagementObjectSearcher(SQL_QUERY); ManagementObjectCollection moc = query.Get(); Console.WriteLine("Found " + moc.Count + " device(s), use the first one."); foreach(ManagementObject dev in moc){ foreach(PropertyData prop in dev.Properties){ Console.WriteLine(prop.Name + ": " + prop.Value); if (prop.Name.Equals("AttachedTo")){ this.comName = (string) prop.Value; } else if (this.baudRate <= 0 && prop.Name.Equals("MaxBaudRateToSerialPort")){ this.baudRate = Convert.ToInt32(prop.Value); } } break; } } public readonly string SQL_QUERY = "SELECT Name, Caption, AttachedTo, MaxBaudRateToSerialPort, " + " PNPDeviceID, StatusInfo, Status " + " From Win32_POTSModem " + " where StatusInfo = 3 and Caption = /"Motorola USB Modem/""; private string comName; private int baudRate;

the fields comName and baudRate will be updated for later use.

写在这里留着自己以后用，见笑了。

- iqueen.blogspot.com