C# - 从串口缓冲区读取数据

Question

我正在尝试从RS-232端口读取数据。有没有人有如何从端口/缓冲区获取数据并确保我拥有所有数据（因为它可能是多行数据）的示例？

我应该如下读取吗？

string Rxstring = port.ReadLine();
Console.WriteLine(Rxstring);

- George

Answer 1

问：如何从端口/缓冲区获取日期或从连接设备输入数据，并确保您拥有所有数据。

答：我曾经广泛使用.net串行端口类驱动程序，被要求创建可靠、强大的代码。这意味着测试中的连接设备必须长时间运行且不会失败。串行端口可能会丢失数据！不要忘记这一点。

//from top of the head;

using System.Port.IO;
using System.Port;

private class mywindowsForm: Form
{
      StringBuilder sbReceived = new StringBuilder();
      string Received = string.Empty;
      int byteCOUNT = 0;

      System.Windows.Timers.Timer serialTimer;

      //Default constructor 
      myWindowsForm()
      {
         //assume that you clicked and dragged serial port in
          serialPort1 = new SerialPort();//create new serial port instance 
          serialPort1.Baud = 9600;
          serialPort1.DataReceived+=<Tab><Enter>
          //serial port timer 
          serialTimer = new System.Windows.Timers.Timer(500);//set to 500ms time delay
          serialTimer.Elapsed+=<TAB><ENTER>
      }

      void serialPort1_DataReceived(object sender, SerialDataReceivedEventArgs e)
      {
           //serial port has detected input data
           //however, we only want to get serial data so,
           if(e.EventType !=SerialData.Chars) return;
           //good design practice dictates that we have an event handler that we invoke
            this.BeginInvoke(new eventhandler(AddReceive));//beginInvoke is designed to deal with asynchronous processes like serial port data. 
      }

      private void AddReceive(object s, EventArg e)
      {
            byteCOUNT=serialPort1.BytesToRead;//count the number of bytes in RX buffer
            if(byteCOUNT > 0) 
             {
                 string ST = serialPort1.ReadTo("\n");//lets get one line at a time 
                 sbReceived.Append(ST);//add whatever has been RX'd to our container. 
                 serialPort1.Interval =100;
                 serialPort1.Start();//to be sure we have all data, check to see for stragglers.
              }
      }

       void serialTimer(object Sender, TimerElapsedEventArgs e)
       {
            serialTimer.Stop();
            this.BeginInvoke(new EventHandler(ReadData));
        }

       void ReadData(object Sender, EventArgs e)
       {
            //parse output for required data and output to terminal display (build one using rich text box)
             Received = sbReceived.ToString();
             //and if we have ANY MORE incoming data left over in serial buffer
              if(Received.Length > 0)
              {
                  //your data 
              }
       }
}

这应该足以让您开始。这是多年在C#中创建定制终端仿真器的结果。还有其他可以做的事情，特别是如果您有大量输入/输出数据需要设置与设备的握手，您必须让设备以设备满意的速率处理。在需要传输较大数据的情况下，请考虑设置简单的分组传递协议和命令信号量构造 - 或使用控制器/设备设计的协议。

- Ron Harding

Answer 2

尝试一下这个：

using System.IO.Ports;
...

private SerialPort port = new SerialPort("COM1", 9600, Parity.None, 8, StopBits.One);

Console.WriteLine(port.ReadExisting());

详细信息可以在Coad的代码中找到。

- John Smithers

---

这个操作是否也会清空缓冲区里的内容，还是我需要手动清空？ - George

这是一个流，因此您可以调用Flush()。 但我认为你不需要它。 详细信息请参见：http://msdn.microsoft.com/en-us/library/system.io.ports.serialport.readexisting.aspx - John Smithers