Var Tcp 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 VarTcpSrvr
{
   private static int SendVarData(Socket s, byte[] data)
   {
      int total = 0;
      int size = data.Length;
      int dataleft = size;
      int sent;

      byte[] datasize = new byte[4];
      datasize = BitConverter.GetBytes(size);
      sent = s.Send(datasize);

      while (total < size)
      {
         sent = s.Send(data, total, dataleft, SocketFlags.None);
         total += sent;
         dataleft -= sent;
      }
      return total;
   }

   private static byte[] ReceiveVarData(Socket s)
   {
      int total = 0;
      int recv;
      byte[] datasize = new byte[4];

      recv = s.Receive(datasize, 0, 4, 0);
      int size = BitConverter.ToInt32(datasize, 0);
      int dataleft = size;
      byte[] data = new byte[size];


      while(total < size)
      {
         recv = s.Receive(data, total, dataleft, 0);
         if (recv == 0)
         {
            data = Encoding.ASCII.GetBytes("exit ");
            break;
         }
         total += recv;
         dataleft -= recv;
      }
      return data;
   }

   public static void Main()
   {
      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...");

      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);
      int sent = SendVarData(client, data);

      for (int i = 0; i < 5; i++)
      {
         data = ReceiveVarData(client);
         Console.WriteLine(Encoding.ASCII.GetString(data));
      }
      Console.WriteLine("Disconnected from {0}", newclient.Address);
      client.Close();
      newsock.Close();
   }
}