Its quite simple to make a chat server.
Here is a sample: (i think, it was from codeproject)
Server Code:
-----
using System;
using System.Threading; // Sleeping
using System.Net; // Used to local machine info
using System.Net.Sockets; // Socket namespace
using System.Collections; // Access to the Array list
namespace ChatServer
{
/// <summary>
/// Main class from which all objects are created
/// </summary>
class AppMain
{
// Attributes
private ArrayList m_aryClients = new ArrayList(); // List of Client Connections
/// <summary>
/// Application starts here. Create an instance of this class and use it
/// as the main object.
/// </summary>
/// <param name="args"></param>
static void Main(string[] args)
{
AppMain app = new AppMain();
// Welcome and Start listening
Console.WriteLine( "*** Chat Server Started {0} *** ", DateTime.Now.ToString( "G" ) );
/*
//
// Method 1
//
Socket client;
const int nPortListen = 399;
try
{
TcpListener listener = new TcpListener( nPortListen );
Console.WriteLine( "Listening as {0}", listener.LocalEndpoint );
listener.Start();
do
{
byte [] m_byBuff = new byte[127];
if( listener.Pending() )
{
client = listener.AcceptSocket();
// Get current date and time.
DateTime now = DateTime.Now;
String strDateLine = "Welcome " + now.ToString("G") + "\n\r";
// Convert to byte array and send.
Byte[] byteDateLine = System.Text.Encoding.ASCII.GetBytes( strDateLine.ToCharArray() );
client.Send( byteDateLine, byteDateLine.Length, 0 );
}
else
{
Thread.Sleep( 100 );
}
} while( true ); // Don't use this.
//Console.WriteLine ("OK that does it! Screw you guys I'm going home..." );
//listener.Stop();
}
catch( Exception ex )
{
Console.WriteLine ( ex.Message );
}
*/
//
// Method 2
//
const int nPortListen = 399;
// Determine the IPAddress of this machine
IPAddress [] aryLocalAddr = null;
String strHostName = "";
try
{
// NOTE: DNS lookups are nice and all but quite time consuming.
strHostName = Dns.GetHostName();
IPHostEntry ipEntry = Dns.GetHostByName( strHostName );
aryLocalAddr = ipEntry.AddressList;
}
catch( Exception ex )
{
Console.WriteLine ("Error trying to get local address {0} ", ex.Message );
}
// Verify we got an IP address. Tell the user if we did
if( aryLocalAddr ="=" null || aryLocalAddr.Length < 1 )
{
Console.WriteLine( "Unable to get local address" );
return;
}
Console.WriteLine( "Listening on : [{0}] {1}:{2}", strHostName, aryLocalAddr[0], nPortListen );
// Create the listener socket in this machines IP address
Socket listener = new Socket( AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp );
listener.Bind( new IPEndPoint( aryLocalAddr[0], 399 ) );
//listener.Bind( new IPEndPoint( IPAddress.Loopback, 399 ) ); // For use with localhost 127.0.0.1
listener.Listen( 10 );
// Setup a callback to be notified of connection requests
listener.BeginAccept( new AsyncCallback( app.OnConnectRequest ), listener );
Console.WriteLine ("Press Enter to exit" );
Console.ReadLine();
Console.WriteLine ("OK that does it! Screw you guys I'm going home..." );
// Clean up before we go home
listener.Close();
GC.Collect();
GC.WaitForPendingFinalizers();
}
/// <summary>
/// Callback used when a client requests a connection.
/// Accpet the connection, adding it to our list and setup to
/// accept more connections.
/// </summary>
/// <param name="ar"></param>
public void OnConnectRequest( IAsyncResult ar )
{
Socket listener = (Socket)ar.AsyncState;
NewConnection( listener.EndAccept( ar ) );
listener.BeginAccept( new AsyncCallback( OnConnectRequest ), listener );
}
/// <summary>
/// Add the given connection to our list of clients
/// Note we have a new friend
/// Send a welcome to the new client
/// Setup a callback to recieve data
/// </summary>
/// <param name="sockClient">Connection to keep</param>
//public void NewConnection( TcpListener listener )
public void NewConnection( Socket sockClient )
{
// Program blocks on Accept() until a client connects.
//SocketChatClient client = new SocketChatClient( listener.AcceptSocket() );
SocketChatClient client = new SocketChatClient( sockClient );
m_aryClients.Add( client );
Console.WriteLine( "Client {0}, joined", client.Sock.RemoteEndPoint );
// Get current date and time.
DateTime now = DateTime.Now;
String strDateLine = "Welcome " + now.ToString("G") + "\n\r";
// Convert to byte array and send.
Byte[] byteDateLine = System.Text.Encoding.ASCII.GetBytes( strDateLine.ToCharArray() );
client.Sock.Send( byteDateLine, byteDateLine.Length, 0 );
client.SetupRecieveCallback( this );
}
/// <summary>
/// Get the new data and send it out to all other connections.
/// Note: If not data was recieved the connection has probably
/// died.
/// </summary>
/// <param name="ar"></param>
public void OnRecievedData( IAsyncResult ar )
{
SocketChatClient client = (SocketChatClient)ar.AsyncState;
byte [] aryRet = client.GetRecievedData( ar );
// If no data was recieved then the connection is probably dead
if( aryRet.Length < 1 )
{
Console.WriteLine( "Client {0}, disconnected", client.Sock.RemoteEndPoint );
client.Sock.Close();
m_aryClients.Remove( client );
return;
}
// Send the recieved data to all clients (including sender for echo)
foreach( SocketChatClient clientSend in m_aryClients )
{
try
{
clientSend.Sock.Send( aryRet );
}
catch
{
// If the send fails the close the connection
Console.WriteLine( "Send to client {0} failed", client.Sock.RemoteEndPoint );
clientSend.Sock.Close();
m_aryClients.Remove( client );
return;
}
}
client.SetupRecieveCallback( this );
}
}
/// <summary>
/// Class holding information and buffers for the Client socket connection
/// </summary>
internal class SocketChatClient
{
private Socket m_sock; // Connection to the client
private byte[] m_byBuff = new byte[50]; // Receive data buffer
/// <summary>
/// Constructor
/// </summary>
/// <param name="sock">client socket conneciton this object represents</param>
public SocketChatClient( Socket sock )
{
m_sock = sock;
}
// Readonly access
public Socket Sock
{
get{ return m_sock; }
}
/// <summary>
/// Setup the callback for recieved data and loss of conneciton
/// </summary>
/// <param name="app"></param>
public void SetupRecieveCallback( AppMain app )
{
try
{
AsyncCallback recieveData = new AsyncCallback(app.OnRecievedData);
m_sock.BeginReceive( m_byBuff, 0, m_byBuff.Length, SocketFlags.None, recieveData, this );
}
catch( Exception ex )
{
Console.WriteLine( "Recieve callback setup failed! {0}", ex.Message );
}
}
/// <summary>
/// Data has been recieved so we shall put it in an array and
/// return it.
/// </summary>
/// &l