Tcp Poll Server : TCP Server : Network C# Source Code

    

/*
C# Network Programming 
by Richard Blum

Publisher: Sybex 
ISBN: 0782141765
*/

using System;
using System.Net;
using System.Net.Sockets;
using System.Text;

public class TcpPollSrvr {
   public static void Main()
   {
      int recv;
      byte[] data = new byte[1024];
      IPEndPoint ipep = new IPEndPoint(IPAddress.Any,
                             9050);

      Socket newsock = new
          Socket(AddressFamily.InterNetwork,
                      SocketType.Stream, ProtocolType.Tcp);

      newsock.Bind(ipep);
      newsock.Listen(10);
      Console.WriteLine("Waiting for a client...");
      bool result;
      int i = 0;
      while(true)
      {
         i++;
         Console.WriteLine("polling for accept#{0}...", i);
         result = newsock.Poll(1000000, SelectMode.SelectRead);
         if (result)
         {
            break;
         }
      }
      Socket client = newsock.Accept();

      IPEndPoint newclient =
                   (IPEndPoint)client.RemoteEndPoint;
      Console.WriteLine("Connected with {0} at port {1}",
                      newclient.Address, newclient.Port);
  
      string welcome = "Welcome to my test server";
      data = Encoding.ASCII.GetBytes(welcome);
      client.Send(data, data.Length,
                        SocketFlags.None);
      
      i = 0;
      while(true)
      {
         Console.WriteLine("polling for receive #{0}...", i);
         i++;
         result = client.Poll(3000000, SelectMode.SelectRead);
         if(result)
         {
            data = new byte[1024];
            i = 0;
            recv = client.Receive(data);
            if (recv == 0)
               break;
       
            Console.WriteLine(
                  Encoding.ASCII.GetString(data, 0, recv));
            client.Send(data, recv, 0);
         }
      }

      Console.WriteLine("Disconnected from {0}",
                        newclient.Address);
      client.Close();
      newsock.Close();
   }
}