对不起,快问:
我有这个硬件设置:
Same machine: “Com3” -> USB -> To Serial -> To USB -> “Com4”
我按照MSDN SerialPort Class和MSDN SerialPort.ReadLine()来构建这个例程:
SerialPort SendSerialPort = new SerialPort("Com3",9600); SerialPort ReceiveSerialPort = new SerialPort("Com4",9600); SendSerialPort.Open(); ReceiveSerialPort.Open(); SendSerialPort.WriteLine("Test"); var message = ReceiveSerialPort.ReadLine(); // control stops here SendSerialPort.Close(); ReceiveSerialPort.Close(); Console.WriteLine(message);
但是,当我倾向于ReadLine()时,我的控件会停止并等待.我没想到的是.
我期待收到字符串Test并将其分配给我的var消息.你能告诉我这里我做错了什么吗?
编辑:
我使用Serial Port Utility Application和it worked just fine测试了我的硬件.
解决方法
我改变了
from the example you linked:
要实际让两个端口都运行来回读写,你实际上需要为两者实现读写的线程.
使用计时器是个好主意.
public static void Main() { SerialPort SendSerialPort = new SerialPort("Com3",9600); SerialPort ReceiveSerialPort = new SerialPort("Com4",9600); StringComparer stringComparer = StringComparer.OrdinalIgnoreCase; Thread readThread = new Thread(Read); // Set the read/write timeouts _serialPort.ReadTimeout = 500; _serialPort.WriteTimeout = 500; SendSerialPort.Open(); ReceiveSerialPort.Open(); bool _continue = true; readThread.Start(); Console.Write("Name: "); name = Console.ReadLine(); Console.WriteLine("Type QUIT to exit"); while (_continue) { message = Console.ReadLine(); if (stringComparer.Equals("quit",message)) _continue = false; else SendSerialPort.WriteLine(String.Format("<{0}>: {1}",name,message)); } readThread.Join(); SendSerialPort.Close(); } public static void Read() { while (_continue) { try { string message = ReceiveSerialPort.ReadLine(); Console.WriteLine(message); } catch (TimeoutException) { } } }
通常,在写入的数据中会有一个开始和结束值,告诉另一个端口消息已完成,并且端口也要验证它们是否正在读取它们应该读取的数据,通常使用有关该数据的命令. (超出此问题的范围).
缺乏和重要的是您的端口的初始化.
我更喜欢使用默认构造函数(仅限首选项)
SerialPort Constructor ()
然后设置任何值,如下所示:
_serialPort.BaudRate = SetPortBaudRate(_serialPort.BaudRate); _serialPort.Parity = SetPortParity(_serialPort.Parity); _serialPort.DataBits = SetPortDataBits(_serialPort.DataBits); _serialPort.StopBits = SetPortStopBits(_serialPort.StopBits); _serialPort.Handshake = SetPortHandshake(_serialPort.Handshake);
所有构造函数都将给出以下值:
07001 For example,the DataBits property defaults to 8,the Parity property defaults to the None enumeration value,the StopBits property defaults to 1,and a default port name of COM1.
即使握手也有默认值.如果你look at the source code.
private const Handshake defaultHandshake = Handshake.None;