C＃-从串行端口缓冲区读入

Question

我正在尝试从RS-232端口读取数据。 有没有人举过一个例子，说明如何从端口/缓冲区获取数据，并确保我拥有所有数据，因为它可以是多行数据。

我是否简单阅读如下？

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

Answer 1

尝试这个：

using System.IO.Ports;
...

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

Console.WriteLine(port.ReadExisting());

有关详细信息，请参见Coad's Code 。

Answer 2

问：如何从端口/缓冲区获取日期，或如何从连接的设备输入数据。 并且确保您拥有所有数据。

答：我曾与.net串行端口类驱动程序进行过广泛的合作，我曾受命创建可靠，强大的代码。 这意味着所连接的被测设备必须运行，并且不会在很长一段时间内发生故障。 串口可以并且确实会丢失数据！ 别忘了

//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 
              }
       }
}

这应该足以让您入门。 这是多年来在c＃中创建自定义终端模拟器的结果。 还有其他事情可以做，特别是如果您有大量I / O数据，则需要与设备建立握手。 您必须让设备以设备满意的速度处理。 在必须传输较大数据的情况下，请考虑建立一个简单的数据包通过协议和命令信号量结构-或使用所定义的控制器/设备可以使用的协议。