如何知道连接了哪个串口外部设备并从该设备读取数据?

How to know on which serial port external device is connected and read data from that device?

我连接了 1 个生成随机数的设备,我想通过我的 Windows 应用程序.

读取该数字

我正在使用此代码:

public static void Main()
{
    SerialPort mySerialPort = new SerialPort("COM19");

    mySerialPort.BaudRate = 115200;
    mySerialPort.Parity = Parity.None;
    mySerialPort.StopBits = StopBits.One;
    mySerialPort.DataBits = 8;
    mySerialPort.Handshake = Handshake.None;

    mySerialPort.DataReceived += new SerialDataReceivedEventHandler(DataReceivedHandler);

    mySerialPort.Open();

    Console.WriteLine("Press any key to continue...");
    Console.WriteLine();
    Console.ReadKey();
    mySerialPort.Close();
}

private static void DataReceivedHandler(object sender, SerialDataReceivedEventArgs e)
{
    SerialPort sp = (SerialPort)sender;
    string indata = sp.ReadExisting();
    Debug.Print("Data Received:");
    Debug.Print(indata);
}

使用这段代码,我成功获取了数据。

但这里的问题是我硬编码了来自设备管理器的 com port(Com19) 我已经检查了我的设备连接到哪个端口,所以我硬编码了它,但我不想这样做。

相反,我会给用户 1 dropdown,用户将只能看到用户设备连接到的端口。因此,当从这个连接的设备获取数据时,我将使用该用户选择的下拉端口。

我是 windows 应用程序的新手,从未做过任何与串口相关的事情。

当我将 arduino 连接到 com 端口时。我已经使用了这段代码(假设 arduino 返回的文本里面有 "Info from Arduino"):

SerialPort currentPort; // global variables
bool ArduinoPortFound = false;

...

        try
        {
            string[] ports = SerialPort.GetPortNames();
            foreach (string port in ports)
            {
                currentPort = new SerialPort(port, 9600);
                if (ArduinoDetected())
                {
                    ArduinoPortFound = true;
                    break;
                }
                else
                {
                    ArduinoPortFound = false;
                }
            }
        }
        catch { }

......

        private bool ArduinoDetected()
    {
        try
        {
            currentPort.Open();
            System.Threading.Thread.Sleep(1000); 

            string returnMessage = currentPort.ReadLine();
            currentPort.Close();

            if (returnMessage.Contains("Info from Arduino"))
            {
                return true;
            }
            else
            {
                return false;
            }
        }
        catch (Exception e)
        {
            return false;
        }
    }

更新: 或者你也可以使用 Windows Management Instrumentation (WMI)

这是关于它的文章: How to programmatically find a COM port by friendly name

ManagementObjectCollection mReturn;
ManagementObjectSearcher mSearch;
mSearch = new ManagementObjectSearcher("Select * from Win32_SerialPort");
mReturn = mSearch.Get();

Combobox cboPort = new Combobox();

foreach (ManagementObject mObj in mReturn)
{
   cboPort.Items.Add(mObj["Name"].ToString());
}

修改你的代码如下

SerialPort mySerialPort = new SerialPort(cboPort.Text);

希望对您有所帮助,根据您的要求进行修改。