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 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：
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(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 }
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(\',\')[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); } }); }); }
