如何知道外部设备连接在哪个串行端口上并从该设备读取数据? [英] How to know on which serial port external device is connected and read data from that device?

问题描述

我已连接1台设备，该设备生成了一些随机数字，我想通过我的 Windows应用程序读取该数字.

I have attached 1 device which generated some random number and i want to read that number through my Windows application.

我正在使用以下代码:

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);
}

使用此代码，我可以成功获取数据.

With this code I am successfully getting data.

但是这里的问题是我已经对来自设备管理器的 com端口(Com19)进行了硬编码，我检查了我的设备连接到哪个端口，所以我已经硬编码了，但是我不想为此.

But problem here is I have hardcoded my com port(Com19) that is from device manager I have checked that to which port my device is connected so I have hardcoded that but I don't want to do this.

相反，我将为用户提供 1下拉列表，在该列表中，用户将仅看到与用户设备连接的端口.因此，当从此连接的设备中获取数据时，我将使用该用户选择的下拉端口.

Instead I will give user 1 dropdown in which user will see only that port to which user device is connected. So when fetching data from this connected device I will use that user selected dropdown port.

我对Windows应用程序非常陌生，从未做过与串行端口相关的任何事情.

I am very much new to windows application and never done anything related to serial port.

推荐答案

当我将arduino连接到com端口时.我已经使用了这段代码(假设arduino返回了带有来自Arduino的信息"的文本):

When I have arduino connected to com port. I have use this code (assuming that arduino returned text with "Info from Arduino" inside):

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，您也可以使用

UPDATE: Or you can also use Windows Management Instrumentation (WMI)

有关此的文章:如何以友好名称通过编程方式找到COM端口

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