什么是阅读使用.NET Framework串行端口的正确方法是什么？ [英] What is the correct way to read a serial port using .NET framework?

问题描述

我读了很多问题，在这里如何读取使用.NET SerialPort类，但没有建议报告办法串口数据已经证明完全有效的我。

I've read a lot of questions here about how to read data from serial ports using the .NET SerialPort class but none of the recommanded approaches have proven completely efficient for me.

下面是code我使用的现在：

Here is the code I am using for now:

SerialPort port = new SerialPort("COM1");
port.DataReceived += new SerialDataReceivedEventHandler(MyDataReceivedHandler);

和事件处理程序：

void MyDataReceivedHandler(object sender, SerialDataReceivedEventArgs e)
{
    int count = port.BytesToRead;
    byte[] ByteArray = new byte[count];
    port.Read(ByteArray, 0, count);
}

但我仍然有时会丢失一些数据。我试过的事件处理程序，但没有运气读取数据不同的方式。

But I am still missing some data sometimes. I've tried different way of reading the data in the event handler but with no luck.

由于.NET 4.5带来了新的可能性做一些异步任务，想与 ReadAsync 方法，这似乎是对的SerialPort流可用，我很好奇，看看有什么会是推荐的方法来处理这​​些情况。

As the .NET 4.5 brings new possibilities to do some asynchronous tasks, like with the ReadAsync method that seems to be useable on a SerialPort stream, I'm curious to see what would be the recommended approach to handle those cases.

推荐答案

你能尝试这样为例东西，我觉得你是想利用是在 port.ReadExisting（）方法

Could you try something like this for example I think what you are wanting to utilize is the port.ReadExisting() Method

 class SerialPortProgram 
 { 
  // 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) 
    { 
      // Instatiate this 
      class new SerialPortProgram(); 
    } 

    private SerialPortProgram() 
    { 
        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()); 
    } 
}

或者是你要根据你想干什么，你可以试试这个做

Or is you want to do it based on what you were trying to do , you can try this

public class MySerialReader : IDisposable
{
  private SerialPort serialPort;
  private Queue<byte> recievedData = new Queue<byte>();

  public MySerialReader()
  {
    serialPort = new SerialPort();
    serialPort.Open();
    serialPort.DataReceived += serialPort_DataReceived;
  }

  void serialPort_DataReceived(object s, SerialDataReceivedEventArgs e)
  {
    byte[] data = new byte[serialPort.BytesToRead];
    serialPort.Read(data, 0, data.Length);
    data.ToList().ForEach(b => recievedData.Enqueue(b));
    processData();
  }

  void processData()
  {
    // Determine if we have a "packet" in the queue
    if (recievedData.Count > 50)
    {
        var packet = Enumerable.Range(0, 50).Select(i => recievedData.Dequeue());
    }
  }

  public void Dispose()
  {
        if (serialPort != null)
        {
            serialPort.Dispose();
        }
  }

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