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：
复制代码
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;
}
}复制代码
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：
复制代码
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);
}
}
}
}复制代码
上位机实现客户端功能。具体如下：
1、字段和属性
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/};
private Thread recListenThread;
public string ReceiveStr { get; set; }
public byte[] ReceiveByte { get; set; }
TagetIPEP是服务器地址和端口。
IsConnected是连接的状态，这个比较重要，在发送和接收时，都要更加IsConnected进行，并更新IsConnected。
Socket用于和客户端通讯。
recListenThread是监听客户端消息的线程。
ReceiveStr和ReceiveByte用来存储客户端发来的消息。
2、方法函数
连接方法：
复制代码
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;
}复制代码
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：
复制代码
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;
}复制代码
关闭方法：
复制代码
public void Close()
{
if (socket != null && socket.Connected)
{
IsConnected = false;
recListenThread.Abort();
Log.WriteLog("关闭连接！");
socket.Shutdown(SocketShutdown.Both);
socket.Close();
}
}复制代码
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：
复制代码
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;
}复制代码
前台调用，声明Timer定时器，每个一秒触发一次。触发事件如下：
复制代码
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(50);
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
}复制代码
刷新UI界面的事件如下：
复制代码
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(',')[0]), 3);
break;
case "C":
CurrentValue = Math.Round(Convert.ToDouble(tcp.ReceiveStr.Split(',')[0]), 3);
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);
if (VoltValues.Count > 30)
{
VoltValues.RemoveAt(0);
CurrentValues.RemoveAt(0);
}
});
});
}
