在线时间:8:00-16:00
迪恩网络APP
随时随地掌握行业动态
扫描二维码
关注迪恩网络微信公众号
由于线程实时读串口的效率不是十分高效,因此比较好的方法是事件触发的方式。在SerialPort类中有DataReceived事件,当串口的读缓存有数据到达时则触发DataReceived事件,其中SerialPort.ReceivedBytesThreshold属性决定了当串口读缓存中数据多少个时才触发DataReceived事件,默认为1。 另外,SerialPort.DataReceived事件运行比较特殊,其运行在辅线程,不能与主线程中的显示数据控件直接进行数据传输,必须用间接的方式实现。如下: SerialPort spSend; //spSend,spReceive用虚拟串口连接,它们之间可以相互传输数据。spSend发送数据 SerialPort spReceive; //spReceive接受数据 TextBox txtSend; //发送区 TextBox txtReceive; //接受区 Button btnSend; //数据发送按钮 delegate void HandleInterfaceUpdateDelegate(string text); //委托,此为重点 HandleInterfaceUpdateDelegate interfaceUpdateHandle; public void InitClient() //窗体控件已在初始化 { interfaceUpdateHandle = new HandleInterfaceUpdateDelegate(UpdateTextBox); //实例化委托对象 spSend.Open(); //SerialPort对象在程序结束前必须关闭,在此说明 spReceive.DataReceived += Ports.SerialDataReceivedEventHandler(spReceive_DataReceived); spReceive.ReceivedBytesThreshold = 1; spReceive.Open(); } public void btnSend_Click(object sender,EventArgs e) { spSend.WriteLine(txtSend.Text); } public void spReceive_DataReceived(object sender,Ports.SerialDataReceivedEventArgs e) { byte[] readBuffer = new byte[spReceive.ReadBufferSize]; spReceive.Read(readBuffer, 0, readBuffer.Length); this.Invoke(interfaceUpdateHandle, new string[] { Encoding.Unicode.GetString(readBuffer) }); } private void UpdateTextBox(string text) { txtReceive.Text = text; } |
请发表评论