条码扫描器 - 串口

Question

因此，我尝试将条形码扫描仪用作“串行”设备，而不是键盘模拟器，但它没有创建 com 端口。我已经扫描了将其设置为串行设备的手册中的设置代码，这似乎正确配置了扫描仪（它停止将扫描的代码发送到文本框\文本编辑器）但是因为没有 COM 端口，我不能当我扫描条形码时捕获数据......

Windows 在第一次插入时安装了驱动程序，没有提供磁盘\驱动程序...想知道是否有其他人遇到过同样的问题.....

这是我的代码....

class Program
{
    // Create the serial port with basic settings
    private SerialPort port = new SerialPort("com1", 9600, Parity.None, 8, StopBits.One);

    [STAThread]
    static void Main(string[] args)
    {
        new Program();
    }

    private Program()
    {

        string[] ports = System.IO.Ports.SerialPort.GetPortNames();

        Console.WriteLine("Incoming Data:");

        // Attach a method to be called when there
        // is data waiting in the port's buffer
        port.DataReceived += new
          SerialDataReceivedEventHandler(port_DataReceived);

        // Begin communications
        port.Open();

        // Enter an application loop to keep this thread alive
        Application.Run();
    }

    private void port_DataReceived(object sender,
      SerialDataReceivedEventArgs e)
    {
        // Show all the incoming data in the port's buffer
        Console.WriteLine(port.ReadExisting());
    }
}

当我尝试打开端口时，我收到错误消息.....'端口 'com1' 不存在'.....

当我创建一个虚拟端口（使用 3rd 方应用程序）时，代码运行但我仍然没有从扫描仪获取数据....

Answer 1

您可以使用以下代码。我可以打开我在特定端口中配置的 COM。 串口_serialPort;

    // delegate is used to write to a UI control from a non-UI thread
    private delegate void SetTextDeleg(string text);

    private void Form1_Load(object sender, EventArgs e)
    {
        // all of the options for a serial device
        // can be sent through the constructor of the SerialPort class
        // PortName = "COM1", Baud Rate = 19200, Parity = None, 
        // Data Bits = 8, Stop Bits = One, Handshake = None
        //_serialPort = new SerialPort("COM8", 19200, Parity.None, 8, StopBits.One);
        _serialPort = new SerialPort("COM8", 19200, Parity.None, 8, StopBits.One);
        _serialPort.Handshake = Handshake.None;
        _serialPort.DataReceived += new SerialDataReceivedEventHandler(sp_DataReceived);
        _serialPort.ReadTimeout = 500;
        _serialPort.WriteTimeout = 500;
        _serialPort.Open();
    }

Answer 2

我正在编写自己的条形码脚本。我的扫描仪默认为即插即用 USB-HID...人机接口设备...而不是 USB-COMn 端口。我必须扫描条形码才能将其切换到串行端口模式。您可以在设备管理器树中观察转换过程……作为“端口”分支萌芽，其中包含条形码扫描仪的详细信息。我的 COM3。

Answer 3

我只是新手，我正在执行任务 - 通过串口从条形码扫描仪接收数据......我花了很多时间......我有下一个结果

using System.IO.Ports;
using System.Timers;

namespace BarCode_manager
{
    public partial class MainWindow : Window
    {

        private static SerialPort currentPort = new SerialPort();
        private static System.Timers.Timer aTimer;

        private delegate void updateDelegate(string txt);

        public MainWindow()
        {
            InitializeComponent();
            currentPort.PortName = "COM6";
            currentPort.BaudRate = 9600;
            currentPort.ReadTimeout = 1000;

            aTimer = new System.Timers.Timer(1000);
            aTimer.Elapsed += OnTimedEvent;
            aTimer.AutoReset = true;
            aTimer.Enabled = true;
        }

        private void OnTimedEvent(object sender, ElapsedEventArgs e)
        {
           if (!currentPort.IsOpen)
            {
                currentPort.Open();
                System.Threading.Thread.Sleep(100); /// for recieve all data from scaner to buffer
                currentPort.DiscardInBuffer();      /// clear buffer          
            }
            try
            {
                string strFromPort = currentPort.ReadExisting();
                lblPortData.Dispatcher.BeginInvoke(new updateDelegate(updateTextBox), strFromPort);
            }
            catch { }
        }

        private void updateTextBox(string txt)
        {
            if (txt.Length != 0)
            {
                aTimer.Stop();
                aTimer.Dispose();
                txtReceive.Text = Convert.ToString(aTimer.Enabled);
                currentPort.Close();
            }
            lblPortData.Text = txt;
            lblCount.Content = txt.Length;
            txtReceive.Text = Convert.ToString(aTimer.Enabled);
        }          

        private void Window_Closing(object sender, System.ComponentModel.CancelEventArgs e)
        {
            if (currentPort.IsOpen)
                currentPort.Close();
        }
    }
}