C# WPF上位机实现和下位机TCP通讯
下位机使用北京大华程控电源DH1766-1,上位机使用WPF。实现了电压电流实时采集,曲线显示。上午在公司调试成功,手头没有程控电源,使用TCP服务端模拟。昨天写的TCP服务端正好排上用场。
界面如下:
服务端
服务端实在上篇基础上实现的。需要做如下更改:
while (true) { try { byte[] bufferDate = new byte[1024]; int realLen = pSocket.Receive(bufferDate); if (realLen <= 0) { this.Invoke(addTextDelegate, pSocket.RemoteEndPoint.ToString() + "退出\r\n"); socketList.Remove(pSocket); //客户端退出的时候会发送一个空字节 pSocket.Shutdown(SocketShutdown.Both); pSocket.Close(); return; } string receiveStr = Encoding.Default.GetString(bufferDate, 0, realLen); switch (receiveStr) { case "MEAS:VOLTage:ALL?\n": proxSocket.Send(Encoding.Default.GetBytes(r.Next(16,25).ToString()+ ","+r.Next(16, 25).ToString()+","+ r.Next(16, 25).ToString())); break; case "MEAS:CURR:ALL?\n": proxSocket.Send(Encoding.Default.GetBytes(r.Next(2, 5).ToString() + "," + r.Next(2, 5).ToString() + "," + r.Next(2, 5).ToString())); break; default: break; } this.Invoke(addTextDelegate, receiveStr + "from" + pSocket.RemoteEndPoint.ToString() + "\r\n"); } catch (Exception ex) { this.Invoke(addTextDelegate, pSocket.RemoteEndPoint.ToString() + "异常退出\r\n"); socketList.Remove(pSocket); pSocket.Shutdown(SocketShutdown.Both); pSocket.Close(); return; } }
在While循环中加入:
switch (receiveStr)
{
case "MEAS:VOLTage:ALL?\n":
proxSocket.Send(Encoding.Default.GetBytes(r.Next(16,25).ToString()+ ","+r.Next(16, 25).ToString()+","+ r.Next(16, 25).ToString()));
break;
case "MEAS:CURR:ALL?\n":
proxSocket.Send(Encoding.Default.GetBytes(r.Next(2, 5).ToString() + "," + r.Next(2, 5).ToString() + "," + r.Next(2, 5).ToString()));
break;
default:
break;
}
模拟电源,当收到电压查询时,发送16~25中随机数,由于电源是三个通道的,因此发送三个随机数,用逗号隔开。同样收到电流查询,发送2~5之间的随机数。
完整的客户端源码:
public partial class Form1 : Form { public Form1() { InitializeComponent(); addTextDelegate = new AddTextDelegate(AddText); } private AddTextDelegate addTextDelegate; private List<Socket> socketList = new List<Socket>(); public delegate void AddTextDelegate(string text); private void AddText(string text) { txtLog.Text += text; } Random r = new Random(); private void btnStart_Click(object sender, EventArgs e) { //参数:寻址方式 传输数据方式 通信协议 Socket socket = new Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp); IPAddress iPAddress = IPAddress.Parse(txtIP.Text); //创建EndPoint IPEndPoint iPEndPoint = new IPEndPoint(iPAddress, int.Parse(txtPort.Text)); //绑定端口 socket.Bind(iPEndPoint); //开启侦听 socket.Listen(10); txtLog.Text += "服务启动开启侦听……\r\n"; Thread thread = new Thread((s) => { Socket serSocket = (Socket)s; while (true)//不断接收客户端连接 { this.Invoke(addTextDelegate, "服务正在等待客户端连接……\r\n"); //开始接收客户端的连接 //阻塞当前线程,等待客户端连接 //客户端连接上之后,服务端自动生成一个socket和连接的客端通信 Socket proxSocket = serSocket.Accept(); this.Invoke(addTextDelegate, "客户端连接成功!\r\n" + proxSocket.RemoteEndPoint.ToString()); //proxSocket.Send(Encoding.Default.GetBytes("连接成功!")); socketList.Add(proxSocket);//当前通信的socket放到集合中 new Thread(p => { Socket pSocket = (Socket)p; while (true) { try { byte[] bufferDate = new byte[1024]; int realLen = pSocket.Receive(bufferDate); if (realLen <= 0) { this.Invoke(addTextDelegate, pSocket.RemoteEndPoint.ToString() + "退出\r\n"); socketList.Remove(pSocket); //客户端退出的时候会发送一个空字节 pSocket.Shutdown(SocketShutdown.Both); pSocket.Close(); return; } string receiveStr = Encoding.Default.GetString(bufferDate, 0, realLen); switch (receiveStr) { case "MEAS:VOLTage:ALL?\n": proxSocket.Send(Encoding.Default.GetBytes(r.Next(16,25).ToString()+ ","+r.Next(16, 25).ToString()+","+ r.Next(16, 25).ToString())); break; case "MEAS:CURR:ALL?\n": proxSocket.Send(Encoding.Default.GetBytes(r.Next(2, 5).ToString() + "," + r.Next(2, 5).ToString() + "," + r.Next(2, 5).ToString())); break; default: break; } this.Invoke(addTextDelegate, receiveStr + "from" + pSocket.RemoteEndPoint.ToString() + "\r\n"); } catch (Exception ex) { this.Invoke(addTextDelegate, pSocket.RemoteEndPoint.ToString() + "异常退出\r\n"); socketList.Remove(pSocket); pSocket.Shutdown(SocketShutdown.Both); pSocket.Close(); return; } } }) { IsBackground = true }.Start(proxSocket); } }); thread.IsBackground = true; thread.Start(socket); } private void btnSend_Click(object sender, EventArgs e) { string str = txtSend.Text; byte[] data = Encoding.Default.GetBytes(str); foreach (var socket in socketList) { if (socket != null && socket.Connected) { socket.Send(data); } } } }
上位机实现客户端功能。具体如下:
1、字段和属性
public bool Connect() { try { socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp) { //ReceiveTimeout = 1000, //SendTimeout=1000 }; //IAsyncResult connResult = socket.BeginConnect(TagetIPEP.Address, TagetIPEP.Port, null, null); //connResult.AsyncWaitHandle.WaitOne(5000, true); //if (connResult.IsCompleted) //{ socket.Connect(TagetIPEP.Address, TagetIPEP.Port); IsConnected = true; //开启接收监听 recListenThread = new Thread(() => { while (true) { try { ReceiveByte = new byte[1024]; int realLen = socket.Receive(ReceiveByte); ReceiveStr = Encoding.Default.GetString(ReceiveByte, 0, realLen); ReceiveEvent(); if (realLen <= 0) { if (socket != null && socket.Connected) { //服务器退出 IsConnected = false; Log.WriteLog("服务器退出!"); socket.Shutdown(SocketShutdown.Both); socket.Close(); MessageBox.Show("连接断开!"); } return; } } catch (Exception ex) { if (socket != null && socket.Connected) { IsConnected = false; Log.WriteLog("服务器异常退出!", ex); socket.Shutdown(SocketShutdown.Both); socket.Close(); } return; } } }) { IsBackground = true }; recListenThread.Start(); return true; //} } catch (Exception ex) { Log.WriteLog(TagetIPEP.Address + "连接失败", ex); } return false; }
连接函数返回值为bool类型,根据返回值判断连接是否成功连接。这里每次连接都实例化了一个socket,因为在执行socket.close()后,重新打开会失败,而断线重连会经常用到,没有找到更好的方法,干脆重新实例化socket。连接成功后,开启监听服务端消息的线程。这里使用了一个ReceiveEvent()事件,在接收到消息时会触发这个事件,刷新UI界面。
发送方法:
public bool Send(string msg) { byte[] sendMsg = Encoding.Default.GetBytes(msg); if (sendMsg.Length > 0&&IsConnected) { if (socket != null && socket.Connected) { try { socket.Send(sendMsg); return true; } catch (Exception ex) { IsConnected = false; Log.WriteLog("发送数据失败,目标地址" + TagetIPEP.Address, ex); } } } return false; }
关闭方法:
public void Close() { if (socket != null && socket.Connected) { IsConnected = false; recListenThread.Abort(); Log.WriteLog("关闭连接!"); socket.Shutdown(SocketShutdown.Both); socket.Close(); } }
在出现异常时调用
消息接收事件:
public event Action ReceiveEvent;
每次接收消息时触发,获取属性ReceiveStr和ReceiveByte的值,刷新UI界面。
完整代码:
public class TCPClient { public TCPClient(/*IPEndPoint localIPEP,*/IPEndPoint targetIPEP) { //socket.Bind(localIPEP); TagetIPEP = targetIPEP; } public readonly IPEndPoint TagetIPEP; public bool IsConnected { get; set; } = false; private Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp) { /*ReceiveTimeout=1000,SendTimeout=1000*/}; public bool Connect() { try { socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp) { //ReceiveTimeout = 1000, //SendTimeout=1000 }; //IAsyncResult connResult = socket.BeginConnect(TagetIPEP.Address, TagetIPEP.Port, null, null); //connResult.AsyncWaitHandle.WaitOne(5000, true); //if (connResult.IsCompleted) //{ socket.Connect(TagetIPEP.Address, TagetIPEP.Port); IsConnected = true; //开启接收监听 recListenThread = new Thread(() => { while (true) { try { ReceiveByte = new byte[1024]; int realLen = socket.Receive(ReceiveByte); ReceiveStr = Encoding.Default.GetString(ReceiveByte, 0, realLen); ReceiveEvent(); if (realLen <= 0) { if (socket != null && socket.Connected) { //服务器退出 IsConnected = false; Log.WriteLog("服务器退出!"); socket.Shutdown(SocketShutdown.Both); socket.Close(); MessageBox.Show("连接断开!"); } return; } } catch (Exception ex) { if (socket != null && socket.Connected) { IsConnected = false; Log.WriteLog("服务器异常退出!", ex); socket.Shutdown(SocketShutdown.Both); socket.Close(); } return; } } }) { IsBackground = true }; recListenThread.Start(); return true; //} } catch (Exception ex) { Log.WriteLog(TagetIPEP.Address + "连接失败", ex); } return false; } public bool Send(string msg) { byte[] sendMsg = Encoding.Default.GetBytes(msg); if (sendMsg.Length > 0&&IsConnected) { if (socket != null && socket.Connected) { try { socket.Send(sendMsg); return true; } catch (Exception ex) { IsConnected = false; Log.WriteLog("发送数据失败,目标地址" + TagetIPEP.Address, ex); } } } return false; } public event Action ReceiveEvent; public string ReceiveStr { get; set; } public byte[] ReceiveByte { get; set; } public void Close() { if (socket != null && socket.Connected) { IsConnected = false; recListenThread.Abort(); Log.WriteLog("关闭连接!"); socket.Shutdown(SocketShutdown.Both); socket.Close(); } } private Thread recListenThread; }
前台调用,声明Timer定时器,每个一秒触发一次。触发事件如下:
private string flag = ""; private void QueryTimer_Elapsed(object sender, System.Timers.ElapsedEventArgs e) { Now = DateTime.Now; if (!tcp.Send("MEAS:VOLTage:ALL?\n")) { queryTimer.Enabled = false; StartContent = "开始"; ConnContent = "连接"; tcp.IsConnected = false; MessageBox.Show("查询失败!"); return; } flag = "V"; Thread.Sleep(); if (!tcp.Send("MEAS:CURR:ALL?\n")) { queryTimer.Enabled = false; StartContent = "开始"; ConnContent = "连接"; tcp.IsConnected = false; MessageBox.Show("查询失败!"); return; } flag = "C"; #region 测试 //angle += 18; //if (angle > 360) //{ // angle = 18; //} #endregion }
刷新UI界面的事件如下:
private void Tcp_ReceiveEvent() { Task.Run(() => { Application.Current.Dispatcher.Invoke(() => { RemoteIP = tcp.TagetIPEP.ToString(); switch (flag) { case "V": VoltValue = Math.Round(Convert.ToDouble(tcp.ReceiveStr.Split(]), ); break; case "C": CurrentValue = Math.Round(Convert.ToDouble(tcp.ReceiveStr.Split(]), ); break; default: break; } #region 测试 //VoltValue = Math.Round(Math.Sin((angle) * pi / 180) * 16 + 16, 3); //CurrentValue = Math.Round(Math.Sin((angle) * pi / 180) * 2.5 + 2.5, 3); #endregion VoltValues.Add(VoltValue); CurrentValues.Add(CurrentValue); ) { VoltValues.RemoveAt(); CurrentValues.RemoveAt(); } }); }); }
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