C # tcpclient application-a simple message sending and receiving

 

The tcpsend window is used to send messages, and an application is written to receive messages.ProgramAfter a message is received, you must close the message receiving window to receive new messages.

Source code:

Message sending windowCode

 

Using system;
Using system. Collections. Generic;
Using system. componentmodel;
Using system. Data;
Using system. drawing;
Using system. text;
Using system. Windows. forms;
Using system. net;
Using system. net. Sockets;
Using system. IO;

Namespace tcpsocket
{
Public partial class frmtcpsend: Form
{
Public frmtcpsend ()
{
Initializecomponent ();
}

Private void buttonsendfile_click (Object sender, eventargs E)
{
// Tcpclient = new tcpclient (textboxhostname. Text, int32.parse (textboxport. Text ));
Tcpclient = new tcpclient ();
Tcpclient. Connect (IPaddress. parse (textboxhostname. Text), int32.parse (textboxport. Text ));

Networkstream NS = tcpclient. getstream ();

Filestream FS = file. Open (".. \ frmtcpsend. cs", filemode. Open );

Int DATA = FS. readbyte ();

While (Data! =-1)
{
NS. writebyte (byte) data );
Data = FS. readbyte ();
}

FS. Close ();
NS. Close ();
Tcpclient. Close ();

}

Private void buttonsendmessage_click (Object sender, eventargs E)
{
Tcpclient = new tcpclient ();
Tcpclient. Connect (IPaddress. parse (textboxhostname. Text), int32.parse (textboxport. Text ));

Networkstream NS = tcpclient. getstream ();

If (NS. canwrite)
{
Byte [] sendbytes = encoding. utf8.getbytes (textboxmessage. Text );
NS. Write (sendbytes, 0, sendbytes. Length );
}
Else
{
MessageBox. Show ("cannot write data streams", "Terminate", messageboxbuttons. OK, messageboxicon. Stop );
// Console. writeline ("You cannot write data to this stream .");
Tcpclient. Close ();

// Closing the tcpclient instance does not close the network stream.
NS. Close ();
Return;
}

NS. Close ();
Tcpclient. Close ();

}
}
}

 

 

Message Receiving Window code

 

 

Using system;
Using system. Collections. Generic;
Using system. componentmodel;
Using system. Data;
Using system. drawing;
Using system. text;
Using system. Windows. forms;
Using system. net;
Using system. net. Sockets;
Using system. IO;
Using system. Threading;

Namespace tcpreceive
{
Public partial class form1: Form
{
Public form1 ()
{
Initializecomponent ();

// Thread = new thread (New threadstart (Listen ));

Thread thread = new thread (New threadstart (socketlisten ));

Thread. Start ();

IPaddress = IPaddress. Any; // IPaddress. parse ("172.16.102.11 ");

This. Text = IPaddress. tostring () + "listening ...";

}

Protected Delegate void updatedisplaydelegate (string text );

Public void listen ()
{
IPaddress = IPaddress. Any; // IPaddress. parse ("172.16.102.11 ");

Tcplistener = new tcplistener (IPaddress, 9999 );
Tcplistener. Start ();

Tcpclient = tcplistener. accepttcpclient ();

Networkstream NS = tcpclient. getstream ();

Streamreader sr = new streamreader (NS );

String result = Sr. readtoend ();

Invoke (New updatedisplaydelegate (updatedisplay), new object [] {result });

Tcpclient. Close ();
Tcplistener. Stop ();
}

Public void socketlisten ()
{
Socket listener = new socket (addressfamily. InterNetwork, sockettype. Stream, protocoltype. TCP );

Listener. BIND (New ipendpoint (IPaddress. Any, 9999 ));

Listener. Listen (0 );

Socket socket = listener. Accept ();
Stream netstream = new networkstream (socket );
Streamreader reader = new streamreader (netstream );

String result = reader. readtoend ();
Invoke (New updatedisplaydelegate (updatedisplay), new object [] {result });

Socket. Close ();
Listener. Close ();

}

Public void updatedisplay (string text)
{
Richtextbox1.text = text;
}

}
}