C # Real-time application technology

Real time application Real-time application technology is used in this article as an example to demonstrate the use of the socket class between a user (TcpClient) request and a server (tcpserver) request. The project also demonstrates how to use ListView control in live projects and how to pass XML format information.

The TcpServer.exe file shows the communication between TCP sockets in a separate thread (rather than in a GUI thread).

The TcpClient.exe file also uses a separate thread to read data from the socket, and then updates the List view control in the form.

The following steps are gathered:

1. TCPServer listens on port 8002 and sends a ray to wait for the client to connect.

Hashtable socketHolder = new Hashtable();
Hashtable threadHolder = new Hashtable();
public Form1()
{
　// Required for Windows Form Designer support
　//
　InitializeComponent();
　tcpLsn = new TcpListener(8002);
　tcpLsn.Start();
　// tcpLsn.LocalEndpoint may have a bug, it only show 0.0.0.0:8002
　stpanel.Text = "Listen at: " + tcpLsn.LocalEndpoint.ToString();
　Thread tcpThd = new Thread(new ThreadStart(WaitingForClient));
　threadHolder.Add(connectId, tcpThd);
　tcpThd.Start() ;
}2. TcpClient and tcpsrv Connect, send the client information packets to the TCPServer, and then launch the thread, which is used to receive data through the socket.

private void Menuconn_click (object sender, System.EventArgs e)


{


Connectdlg Mydlg = new Connectdlg ();


Mydlg.showdialog (this);


if (Mydlg.dialogresult==dialogresult.ok)


　{


s = new Socket (AddressFamily.InterNetwork, sockettype.stream,protocoltype.tcp);


IPAddress Hostadd = Ipaddress.parse (Mydlg.ipadd);


int Port=int32.parse (mydlg.portnum);


IPEndPoint ephost = new IPEndPoint (Hostadd, Port);


Try


　　{


S.connect (ephost);


if (s.connected)


　　　{


byte[] Bbuf;


string buf;


buf = String.Format ("{0}:{1}", Mydlg.username,mydlg.password);


Bbuf=ascii. GetBytes (BUF);


s.send (bbuf, 0, bbuf.length,0);


t = new Thread (new ThreadStart (Startrecieve));


T.start ();


Sbar. text= "Ready to recieve data";


　　　}


　　}


catch (Exception E1)


　　{


MessageBox.Show (E1. ToString ());


　　}


　}


}


private void Startrecieve ()


{


miv = new MethodInvoker (this. Updatelistview);


int cnt=0;


string Tmp=null;


byte[] firstb= new byte[1];


while (true)


　{


Try


　　{


byte[] receive = new byte[1];


int ret = s.receive (Receive, 1, 0);


if (Ret > 0)


　　　{


switch (receive[0])


　　　　{


Case One://check Start message


cnt=0;


break;


Case://Check End message


cnt=0;


if (firstb[0] = = ': ')


Handlecommand (TMP);


else if (firstb[0] = = ' < ')


handlexml (TMP);


Else


Handletext (TMP);


Tmp=null;


break;


Default:


if (cnt = 0)


firstb[0] = receive[0];


tmp + System.Text.Encoding


　　　　　　　　　. Ascii. GetString (receive);


cnt++;


break;


　　　　　　　　}


　　　　　　　}


　　　　}


catch (Exception e)


　　　　{


if (!s.connected)


　　　　　　{


break;


　　　　　　}


　　　　　}


　　　}


T.abort ();


　　}3.TcpServer receives connection requests from TcpClient, saves the socket instance to the hash table, and then launches the thread to control the communication of the socket while displaying the client information in the ListView control.