/*
C# Network Programming
by Richard Blum

Publisher: Sybex
ISBN: 0782141765
*/
using System;
using System.Net;
using System.Net.Sockets;
using System.Text;

public class TestUdpSrvr
{
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.Dgram, ProtocolType.Udp);

newsock.Bind(ipep);
Console.WriteLine(“Waiting for a client…”);

IPEndPoint sender = new IPEndPoint(IPAddress.Any, 0);
EndPoint tmpRemote = (EndPoint)(sender);

recv = newsock.ReceiveFrom(data, ref tmpRemote);

Console.WriteLine(“Message received from {0}:”, tmpRemote.ToString());
Console.WriteLine(Encoding.ASCII.GetString(data, 0, recv));

string welcome = “Welcome to my test server”;
data = Encoding.ASCII.GetBytes(welcome);
newsock.SendTo(data, data.Length, SocketFlags.None, tmpRemote);

for(int i = 0; i < 5; i++) { data = new byte[1024]; recv = newsock.ReceiveFrom(data, ref tmpRemote); Console.WriteLine(Encoding.ASCII.GetString(data, 0, recv)); } newsock.Close(); } } [/csharp]

   


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

public class UdpClientMultiRecv
{
   public static void Main()
   {
      UdpClient sock = new UdpClient(9050);
      Console.WriteLine("Ready to receive...");

      sock.JoinMulticastGroup(IPAddress.Parse("192.100.0.1"), 50);
      IPEndPoint iep = new IPEndPoint(IPAddress.Any, 0);
      byte[] data = sock.Receive(ref iep);
      string stringData = Encoding.ASCII.GetString(data, 0, data.Length);
      Console.WriteLine("received: {0}  from: {1}", stringData, iep.ToString());
      sock.Close();
   }
}
           
          

   


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

public class UdpClientMultiSend
{
   public static void Main()
   {
      UdpClient sock = new UdpClient();
      IPEndPoint iep = new IPEndPoint(IPAddress.Parse("192.100.0.1"), 9050);
      byte[] data = Encoding.ASCII.GetBytes("This is a test message");
      sock.Send(data, data.Length, iep);
      sock.Close();
   }
}

           
          

   

/*
C# Network Programming 
by Richard Blum

Publisher: Sybex 
ISBN: 0782141765
*/
using System;
using System.Net;
using System.Net.Sockets;
using System.Text;

public class UdpClientSample
{
   public static void Main()
   {
      byte[] data = new byte[1024];
      string input, stringData;
      UdpClient server = new UdpClient("127.0.0.1", 9050);

      IPEndPoint sender = new IPEndPoint(IPAddress.Any, 0);

      string welcome = "Hello, are you there?";
      data = Encoding.ASCII.GetBytes(welcome);
      server.Send(data, data.Length);

      data = server.Receive(ref sender);

      Console.WriteLine("Message received from {0}:", sender.ToString());
      stringData = Encoding.ASCII.GetString(data, 0, data.Length);
      Console.WriteLine(stringData);

      while(true)
      {
         input = Console.ReadLine();
         if (input == "exit")
            break;
       
         server.Send(Encoding.ASCII.GetBytes(input), input.Length);
         data = server.Receive(ref sender);
         stringData = Encoding.ASCII.GetString(data, 0, data.Length);
         Console.WriteLine(stringData);
      }
      Console.WriteLine("Stopping client");
      server.Close();
   }
}

           
          

   

/*
C# Network Programming 
by Richard Blum

Publisher: Sybex 
ISBN: 0782141765
*/
using System;
using System.Net;
using System.Net.Sockets;
using System.Text;

public class BinaryUdpClient
{
   public static void Main()
   {
      byte[] data = new byte[1024];
      string stringData;
      UdpClient server = new UdpClient("127.0.0.1", 9050);

      IPEndPoint sender = new IPEndPoint(IPAddress.Any, 0);

      string welcome = "Hello, are you there?";
      data = Encoding.ASCII.GetBytes(welcome);
      server.Send(data, data.Length);

      data = new byte[1024];
      data = server.Receive(ref sender);

      Console.WriteLine("Message received from {0}:", sender.ToString());
      stringData = Encoding.ASCII.GetString(data, 0, data.Length);
      Console.WriteLine(stringData);
   
      int test1 = 45;
      double test2 = 3.14159;
      int test3 = -1234567890;
      bool test4 = false;
      string test5 = "This is a test.";

      byte[] data1 = BitConverter.GetBytes(test1);
      server.Send(data1, data1.Length);

      byte[] data2 = BitConverter.GetBytes(test2);
      server.Send(data2, data2.Length);

      byte[] data3 = BitConverter.GetBytes(test3);
      server.Send(data3, data3.Length);

      byte[] data4 = BitConverter.GetBytes(test4);
      server.Send(data4, data4.Length);

      byte[] data5 = Encoding.ASCII.GetBytes(test5);
      server.Send(data5, data5.Length);

      Console.WriteLine("Stopping client");
      server.Close();
   }
}

           
          

   

/*
C# Network Programming 
by Richard Blum

Publisher: Sybex 
ISBN: 0782141765
*/
using System;
using System.Net;
using System.Net.Sockets;
using System.Text;

public class BadUdpClient
{
   public static void Main()
   {
      byte[] data = new byte[30];
      string input, stringData;
      IPEndPoint ipep = new IPEndPoint(
                      IPAddress.Parse("127.0.0.1"), 9050);

      Socket server = new Socket(AddressFamily.InterNetwork,
                     SocketType.Dgram, ProtocolType.Udp);

      string welcome = "Hello, are you there?";
      data = Encoding.ASCII.GetBytes(welcome);
      server.SendTo(data, data.Length, SocketFlags.None, ipep);

      IPEndPoint sender = new IPEndPoint(IPAddress.Any, 0);
      EndPoint tmpRemote = (EndPoint)sender;

      data = new byte[30];
      int recv = server.ReceiveFrom(data, ref tmpRemote);

      Console.WriteLine("Message received from {0}:", tmpRemote.ToString());
      Console.WriteLine(Encoding.ASCII.GetString(data, 0, recv));


      while(true)
      {
         input = Console.ReadLine();
         if (input == "exit")
            break;
         server.SendTo(Encoding.ASCII.GetBytes(input), tmpRemote);
         data = new byte[30];
         recv = server.ReceiveFrom(data, ref tmpRemote);
         stringData = Encoding.ASCII.GetString(data, 0, recv);
         Console.WriteLine(stringData);
      }
      Console.WriteLine("Stopping client");
      server.Close();
   }
}

           
          

   

/*
C# Network Programming 
by Richard Blum

Publisher: Sybex 
ISBN: 0782141765
*/
using System;
using System.Net;
using System.Net.Sockets;
using System.Text;

public class BetterdUdpClient
{
   public static void Main()
   {
      byte[] data = new byte[30];
      string input, stringData;
      IPEndPoint ipep = new IPEndPoint(
                      IPAddress.Parse("127.0.0.1"), 9050);

      Socket server = new Socket(AddressFamily.InterNetwork,
                     SocketType.Dgram, ProtocolType.Udp);

      string welcome = "Hello, are you there?";
      data = Encoding.ASCII.GetBytes(welcome);
      server.SendTo(data, data.Length, SocketFlags.None, ipep);

      IPEndPoint sender = new IPEndPoint(IPAddress.Any, 0);
      EndPoint tmpRemote = (EndPoint)sender;

      data = new byte[30];
      int recv = server.ReceiveFrom(data, ref tmpRemote);

      Console.WriteLine("Message received from {0}:", tmpRemote.ToString());
      Console.WriteLine(Encoding.ASCII.GetString(data, 0, recv));


      int i = 30;
      while(true)
      {
         input = Console.ReadLine();
         if (input == "exit")
            break;
         server.SendTo(Encoding.ASCII.GetBytes(input), tmpRemote);
         data = new byte[i];
         try
         {
            recv = server.ReceiveFrom(data, ref tmpRemote);
            stringData = Encoding.ASCII.GetString(data, 0, recv);
            Console.WriteLine(stringData);
         } catch (SocketException)
         {
            Console.WriteLine("WARNING: data lost, retry message.");
            i += 10;
         }
      }
      Console.WriteLine("Stopping client");
      server.Close();
   }
}