tcplistener and services

tcplistener and services

• Siliconxp

  Here is a quick sample (I would never use this in production code as there are better ways of doing it .. ) but it is the easiest way to listen on two sockets .. It is the above example modified to use two TCPListeners without threading.

  using System;

  using System.Net;

  using System.Net.Sockets;

  using System.Text;

  using System.Threading;

  using System.Globalization;

  class Server {

  public static void Main() {

  DateTime now;

  String strDateLine;

  Encoding ASCII = Encoding.ASCII;

  Thread.CurrentThread.CurrentCulture = CultureInfo.InvariantCulture;

  try {

  TcpListener tcp1 = new TcpListener(13); // listen on port 13

  TcpListener tcp2 = new TcpListener(1313); // listen on port 1313

  tcp1.Start();

  tcp2.Start();

  Console.WriteLine("Waiting for clients to connect");

  Console.WriteLine("Press Ctrl+c to Quit...");

  Socket s = null;

  while (true) {

  if(tcp1.Pending()) {

  s = tcp1.AcceptSocket();

  } else if(tcp2.Pending()) {

  s = tcp2.AcceptSocket();

  }

  if(s!=null) {

  // Get the current date and time then concatenate it

  // into a string

  now = DateTime.Now;

  strDateLine = now.ToShortDateString() + " " + now.ToLongTimeString();

  // Convert the string to a Byte Array and send it

  Byte[] byteDateLine = ASCII.GetBytes(strDateLine.ToCharArray());

  s.Send(byteDateLine, byteDateLine.Length, 0);

  s.Close();

  s=null;

  Console.WriteLine("Sent {0}", strDateLine);

  }

  Thread.Sleep(100);

  }

  }

  catch (SocketException socketError) {

  if (socketError.ErrorCode == 10048) {

  Console.WriteLine("Connection to this port failed. There is another server is listening on this port.");

  }

  }

  }

  }

  
  

• ski99

  No you should be able to create two TCPListeners one for each port. The only "gotcha" would be if you follow examples such as http://samples.gotdotnet.com/quickstart/util/srcview.aspx path=/quickstart/howto/samples/net/TCPUDP/dateTimeServer.src&file=CS\dateTimeServer.cs&font=3 you would need to run 2 threads (one for each listener).

  Cheers,

  Greg

  
  
• tcplistener and services