Dotnet (C #) socket BASIC Programming

Programming Socket BASIC Programming

Service side:

Using System.Net;

Using System.Net.Sockets;

Using System.Text;

Using System.Threading;




Thread Mythread;

Socket socket;


Clean up all resources that are in use.

protected override void Dispose (bool disposing)

{

Try

{

Socket. Close ()//Free resources

Mythread. Abort ()//Abort thread

}

catch{}



if (disposing)

{

if (Components!= null)

{

Components. Dispose ();

}

}

Base. Dispose (disposing);

}

public static IPAddress Getserverip ()

{

Iphostentry Ieh=dns.gethostbyname (Dns.gethostname ());

Return Ieh. ADDRESSLIST[0];

}

private void Beginlisten ()

{

IPAddress Serverip=getserverip ();

IPEndPoint iep=new IPEndPoint (serverip,8000);

Socket=new Socket (ADDRESSFAMILY.INTERNETWORK,SOCKETTYPE.STREAM,PROTOCOLTYPE.TCP);



Byte[] Bytemessage=new byte[100];

This.label1.text=iep. ToString ();

Socket. Bind (IEP);

Todo

while (true)

{

Try

{

Socket. Listen (5);

Socket Newsocket=socket. Accept ();

Newsocket.receive (Bytemessage);



String stime = DateTime.Now.ToShortTimeString ();

String msg=stime+ ":" + "message from:";

Msg+=newsocket.remoteendpoint.tostring () +encoding.default.getstring (bytemessage);

THIS.LISTBOX1.ITEMS.ADD (msg);



}

catch (SocketException ex)

{

This.label1.text+=ex. ToString ();

}

}

while (Bytemessage!=null);

}

Start listening.

private void Button1_Click (object sender, System.EventArgs e)

{

Try

{

Mythread = new Thread (new ThreadStart (Beginlisten));

Mythread. Start ();



}

catch (System.Exception er)

{

MessageBox.Show (Er. Message, "complete", messageboxbuttons.ok,messageboxicon.stop);

}

}





Client:



Using System.Net;

Using System.Net.Sockets;

Using System.Text;



private void Button1_Click (object sender, System.EventArgs e)

{

BeginSend ();

}

private void BeginSend ()

{

String Ip=this.txtip.text;

String Port=this.txtport.text;



IPAddress Serverip=ipaddress.parse (IP);

int Serverport=convert.toint32 (port);

IPEndPoint iep=new IPEndPoint (serverip,serverport);

Byte[] Bytemessage;

Todo

// {

Socket socket=new socket (ADDRESSFAMILY.INTERNETWORK,SOCKETTYPE.STREAM,PROTOCOLTYPE.TCP);

Socket. Connect (IEP);



Bytemessage=encoding.ascii.getbytes (TextBox1.Text);

Socket. Send (Bytemessage);

Socket. Shutdown (Socketshutdown.both);

Socket. Close ();

// }

while (Bytemessage!=null);

}



Sending and receiving terminals based on TCP protocol



Receiving end of TCP protocol



Using System.Net.Sockets; Use to Tcplisten class

Using System.Threading; Use to Thread

Using System.IO; Use to StreamReader class



int port = 8000; Define the listening port number

Private Thread Ththreadread; Create threads to listen for port numbers, receive information

Private TcpListener Tltcplisten; Listening port number

private bool Blistener = true; Set the indicator bit to determine the listening state

Private NetworkStream Nsstream; Create a received basic data stream

Private StreamReader Srread;

Private System.Windows.Forms.StatusBar statusBar1;

Private System.Windows.Forms.Button button1;

Private System.Windows.Forms.ListBox ListBox1; Reading data from the network underlying data stream

Private TcpClient tcclient;



private void Listen ()

{

Try

{

Tltcplisten = new TcpListener (port); Initializes the TcpListener instance with a 8000 port number

Tltcplisten.start (); Start listening.

Statusbar1.text = "is listening ...";

Tcclient = Tltcplisten.accepttcpclient (); Request via TCP connection

Nsstream = Tcclient.getstream (); Gets the network underlying data stream that is used to send and receive data

Srread=new StreamReader (Nsstream)//To initialize the StreamReader instance with the resulting network underlying data stream

Statusbar1.text = "Already connected!" ";



while (Blistener)//circular Listening

{

String smessage = Srread.readline ();//reading a row of data from the network underlying data stream

if (smessage = = "STOP")//Determine if the Disconnect TCP connection control code

{

Tltcplisten.stop (); Turn off listening

Nsstream.close (); Releasing resources

Srread.close ();

Statusbar1.text = "The connection has been closed!" " ;

Ththreadread.abort (); Abort thread

Return

}



String stime = DateTime.Now.ToShortTimeString (); Gets the time when the data is received

LISTBOX1.ITEMS.ADD (stime + "" + smessage);

}

}

catch (System.Security.SecurityException)

{

MessageBox.Show ("Listening failed!") "," wrong ");

}

}

Start listening.

private void Button1_Click (object sender, System.EventArgs e)

{

Ththreadread = new Thread (new ThreadStart (Listen));

Ththreadread.start ()//Start thread

Button1. Enabled=false;

}

Clean up all resources that are in use.

protected override void Dispose (bool disposing)

{

Try

{

Tltcplisten.stop (); Turn off listening

Nsstream.close ();

Srread.close ()//Releasing Resources

Ththreadread.abort ()//Abort thread

}

catch{}



if (disposing)

{

if (Components!= null)

{

Components. Dispose ();

}

}

Base. Dispose (disposing);

}



Sending end of TCP protocol



Using System.Net.Sockets; Use to Tcplisten class

Using System.Threading; Use to Thread

Using System.IO; Use to StreamWriter class

Using System.Net; Use IPAddress class, Iphostentry class, etc.



Private StreamWriter Swwriter; Used to spread data to the network's underlying data

Private NetworkStream Nsstream; Create a network underlying data stream for sending data

Private TcpClient TcpClient;

Private System.Windows.Forms.Button button1;

Private System.Windows.Forms.TextBox TextBox1;

Private System.Windows.Forms.Button button2;

Private System.Windows.Forms.TextBox TextBox2;

Private System.Windows.Forms.StatusBar statusBar1;

Private System.Windows.Forms.Label Label1;

Private System.Windows.Forms.Label Label2; It implements a TCP connection request to a remote host

private bool Tcpconnect = false; Defines identifiers that indicate whether a TCP connection is established



Connection

private void Button1_Click (object sender, System.EventArgs e)

{

IPAddress Ipremote;

Try

{

Ipremote = Ipaddress.parse (TextBox1.Text);

}

Catch//Judge the legality of a given IP address

{

MessageBox.Show ("The IP address entered is illegal!") "," the wrong hint! " ) ;

return;

}



Iphostentry Iphost;

Try

{

Iphost = Dns.resolve (TextBox1.Text);

}

Catch//Determine whether the IP address corresponds to the host online

{

MessageBox.Show ("Remote host is not on line!") "," the wrong hint! " ) ;

return;

}



string shostname = Iphost.hostname;

Try

{

TcpClient tcpclient = new TcpClient (shostname,8000)//TCP connection request for 8000 port of remote host

Nsstream = Tcpclient.getstream ()//request, and get the network underlying data stream for transferring data

Swwriter = new StreamWriter (nsstream), or//using the obtained network underlying data stream to initialize the StreamWriter instance

Button1. Enabled = false;

Button2. Enabled = true;

Tcpconnect = true;

Statusbar1.text = "Already connected!" " ;

}

Catch

{

MessageBox.Show ("Cannot establish a connection with the remote host 8000 port!") "," the wrong hint! " ) ;

return;

}

}



Send

private void Button2_Click (object sender, System.EventArgs e)

{

if (TextBox2.Text!= "")

{

Swwriter.writeline (TextBox2.Text)//Refresh data in current data stream

Swwriter.flush ();

}

Else

{

MessageBox.Show ("Send message cannot be empty!") "," the wrong hint! ");

}

}

Clean up all resources that are in use.

protected override void Dispose (bool disposing)

{

if (Tcpconnect)

{

Swwriter.writeline ("STOP"); Send control code

Swwriter.flush (); Refreshing data in the current data stream

Nsstream.close (); Clear Resources

Swwriter.close ();

}

if (disposing)

{

if (Components!= null)

{

Components. Dispose ();

}

}

Base. Dispose (disposing);

}