Csharp/C Sharp/Network/Udp Client

Bad Udp Client

<source lang="csharp"> /* 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();
  }

}

      </source>

Best Udp Client

<source lang="csharp"> /* C# Network Programming by Richard Blum Publisher: Sybex ISBN: 0782141765

• /

using System; using System.Net; using System.Net.Sockets; using System.Text; public class BestUdpClient {

  private static byte[] data = new byte[1024];
  private static IPEndPoint sender = new IPEndPoint(IPAddress.Any, 0);
  private static EndPoint Remote = (EndPoint)sender;
  private static int size = 30;
  private static int AdvSndRcvData(Socket s, byte[] message, EndPoint rmtdevice)
  {
     int recv = 0;
     int retry = 0;
     while (true)
     {
        Console.WriteLine("Attempt #{0}", retry);
        try
        {
           s.SendTo(message, message.Length, SocketFlags.None, rmtdevice);
           data = new byte[size];
           recv = s.ReceiveFrom(data, ref Remote);
        } catch (SocketException e)
        {
           if (e.ErrorCode == 10054)
              recv = 0;
           else if (e.ErrorCode == 10040)
           {
              Console.WriteLine("Error receiving packet");
              size += 10;
              recv = 0;
           }
        }
        if (recv > 0)
        {
           return recv;
        } else
        {
           retry++;
           if (retry > 4)
           {
              return 0;
           }
        }
     }
  }
  public static void Main()
  {
     string input, stringData;
     int recv;
     IPEndPoint ipep = new IPEndPoint(
                     IPAddress.Parse("127.0.0.1"), 9050);
     Socket server = new Socket(AddressFamily.InterNetwork,
                    SocketType.Dgram, ProtocolType.Udp);
     int sockopt = (int)server.GetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReceiveTimeout);
     Console.WriteLine("Default timeout: {0}", sockopt);
     server.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReceiveTimeout, 3000);
     sockopt = (int)server.GetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReceiveTimeout);
     Console.WriteLine("New timeout: {0}", sockopt);

     string welcome = "Hello, are you there?";
     data = Encoding.ASCII.GetBytes(welcome);
     recv = AdvSndRcvData(server, data, ipep);
     if (recv > 0)
     {
        stringData = Encoding.ASCII.GetString(data, 0, recv);
        Console.WriteLine(stringData);
     } else
     {
        Console.WriteLine("Unable to communicate with remote host");
        return;
     }
     while(true)
     {
        input = Console.ReadLine();
        if (input == "exit")
           break;
        recv = AdvSndRcvData(server, Encoding.ASCII.GetBytes(input), ipep);
        if (recv > 0)
        {
           stringData = Encoding.ASCII.GetString(data, 0, recv);
           Console.WriteLine(stringData);
        } else
           Console.WriteLine("Did not receive an answer");
     }
     Console.WriteLine("Stopping client");
     server.Close();
  }

}

      </source>

Better Udp Client

<source lang="csharp"> /* 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();
  }

}

      </source>

Binary Udp Client

<source lang="csharp"> /* 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();
  }

}

      </source>

Exception Udp Client

<source lang="csharp"> /* C# Network Programming by Richard Blum Publisher: Sybex ISBN: 0782141765

• /

using System; using System.Net; using System.Net.Sockets; using System.Text; public class ExceptionUdpClient {

  public static void Main()
  {
     byte[] data = new byte[1024];
     string input, stringData;
     int recv;
     IPEndPoint ipep = new IPEndPoint(
                     IPAddress.Parse("127.0.0.1"), 9050);
     Socket server = new Socket(AddressFamily.InterNetwork,
                    SocketType.Dgram, ProtocolType.Udp);
     int sockopt = (int)server.GetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReceiveTimeout);
     Console.WriteLine("Default timeout: {0}", sockopt);
     server.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReceiveTimeout, 3000);
     sockopt = (int)server.GetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReceiveTimeout);
     Console.WriteLine("New timeout: {0}", sockopt);
     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 Remote = (EndPoint)sender;
     data = new byte[1024];
     try
     {
        recv = server.ReceiveFrom(data, ref Remote);
        Console.WriteLine("Message received from {0}:", Remote.ToString());
        Console.WriteLine(Encoding.ASCII.GetString(data, 0, recv));
     } catch (SocketException)
     {
        Console.WriteLine("Problem communicating with remote server");
        return;
     }
     while(true)
     {
        input = Console.ReadLine();
        if (input == "exit")
           break;
        server.SendTo(Encoding.ASCII.GetBytes(input), ipep);
        data = new byte[1024];
        try
        {
           recv = server.ReceiveFrom(data, ref Remote);
           stringData = Encoding.ASCII.GetString(data, 0, recv);
           Console.WriteLine(stringData);
        } catch (SocketException)
        {
           Console.WriteLine("Error receiving message");
        }
     }
     Console.WriteLine("Stopping client");
     server.Close();
  }

}

      </source>

Odd Udp Client

<source lang="csharp"> using System; using System.Net; using System.Net.Sockets; using System.Text; public class OddUdpClient {

  public static void Main()
  {
     byte[] data = new byte[1024];
     string input, stringData;
     IPEndPoint ipep = new IPEndPoint(
                     IPAddress.Parse("127.0.0.1"), 9050);
     Socket server = new Socket(AddressFamily.InterNetwork,
                    SocketType.Dgram, ProtocolType.Udp);
     server.Connect(ipep);
     string welcome = "Hello, are you there?";
     data = Encoding.ASCII.GetBytes(welcome);
     server.Send(data);
     data = new byte[1024];
     int recv = server.Receive(data);
     Console.WriteLine("Message received from {0}:", ipep.ToString());
     Console.WriteLine(Encoding.ASCII.GetString(data, 0, recv));

     while(true)
     {
        input = Console.ReadLine();
        if (input == "exit")
           break;
        server.Send(Encoding.ASCII.GetBytes(input));
        data = new byte[1024];
        recv = server.Receive(data);
        stringData = Encoding.ASCII.GetString(data, 0, recv);
        Console.WriteLine(stringData);
     }
     Console.WriteLine("Stopping client");
     server.Close();
  }

}

      </source>

Retry Udp Client

<source lang="csharp"> /* C# Network Programming by Richard Blum Publisher: Sybex ISBN: 0782141765

• /

using System; using System.Net; using System.Net.Sockets; using System.Text; public class RetryUdpClient {

  private byte[] data = new byte[1024];
  private static IPEndPoint sender = new IPEndPoint(IPAddress.Any, 0);
  private static EndPoint Remote = (EndPoint)sender;
  private int SndRcvData(Socket s, byte[] message, EndPoint rmtdevice)
  {
     int recv;
     int retry = 0;
     while (true)
     {
        Console.WriteLine("Attempt #{0}", retry);
        try
        {
           s.SendTo(message, message.Length, SocketFlags.None, rmtdevice);
           data = new byte[1024];
           recv = s.ReceiveFrom(data, ref Remote);
        } catch (SocketException)
        {
           recv = 0;
        }
        if (recv > 0)
        {
           return recv;
        } else
        {
           retry++;
           if (retry > 4)
           {
              return 0;
           }
        }
     }
  }
  public RetryUdpClient()
  {
     string input, stringData;
     int recv;
     IPEndPoint ipep = new IPEndPoint(
                     IPAddress.Parse("127.0.0.1"), 9050);
     Socket server = new Socket(AddressFamily.InterNetwork,
                    SocketType.Dgram, ProtocolType.Udp);
     int sockopt = (int)server.GetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReceiveTimeout);
     Console.WriteLine("Default timeout: {0}", sockopt);
     server.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReceiveTimeout, 3000);
     sockopt = (int)server.GetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReceiveTimeout);
     Console.WriteLine("New timeout: {0}", sockopt);
     string welcome = "Hello, are you there?";
     data = Encoding.ASCII.GetBytes(welcome);
     recv = SndRcvData(server, data, ipep);
     if (recv > 0)
     {
        stringData = Encoding.ASCII.GetString(data, 0, recv);
        Console.WriteLine(stringData);
     } else
     {
        Console.WriteLine("Unable to communicate with remote host");
        return;
     }
     while(true)
     {
        input = Console.ReadLine();
        if (input == "exit")
           break;
        recv = SndRcvData(server, Encoding.ASCII.GetBytes(input), ipep);
        if (recv > 0)
        {
           stringData = Encoding.ASCII.GetString(data, 0, recv);
           Console.WriteLine(stringData);
        } else
           Console.WriteLine("Did not receive an answer");
     }
     Console.WriteLine("Stopping client");
     server.Close();
  }
  public static void Main()
  {
     RetryUdpClient ruc = new RetryUdpClient();
  }

}

      </source>

Simple Udp Client

<source lang="csharp"> /* C# Network Programming by Richard Blum Publisher: Sybex ISBN: 0782141765

• /

using System; using System.Net; using System.Net.Sockets; using System.Text; public class SimpleUdpClient {

  public static void Main()
  {
     byte[] data = new byte[1024];
     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 Remote = (EndPoint)sender;
     data = new byte[1024];
     int recv = server.ReceiveFrom(data, ref Remote);
     Console.WriteLine("Message received from {0}:", Remote.ToString());
     Console.WriteLine(Encoding.ASCII.GetString(data, 0, recv));
     while(true)
     {
        input = Console.ReadLine();
        if (input == "exit")
           break;
        server.SendTo(Encoding.ASCII.GetBytes(input), Remote);
        data = new byte[1024];
        recv = server.ReceiveFrom(data, ref Remote);
        stringData = Encoding.ASCII.GetString(data, 0, recv);
        Console.WriteLine(stringData);
     }
     Console.WriteLine("Stopping client");
     server.Close();
  }

}

      </source>

Test Udp Client

<source lang="csharp"> using System; using System.Net; using System.Net.Sockets; using System.Text; public class TestUdpClient {

  public static void Main()
  {
     byte[] data = new byte[1024];
     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[1024];
     int recv = server.ReceiveFrom(data, ref tmpRemote);
     Console.WriteLine("Message received from {0}:", tmpRemote.ToString());
     Console.WriteLine(Encoding.ASCII.GetString(data, 0, recv));

     server.SendTo(Encoding.ASCII.GetBytes("message 1"), tmpRemote);
     server.SendTo(Encoding.ASCII.GetBytes("message 2"), tmpRemote);
     server.SendTo(Encoding.ASCII.GetBytes("message 3"), tmpRemote);
     server.SendTo(Encoding.ASCII.GetBytes("message 4"), tmpRemote);
     server.SendTo(Encoding.ASCII.GetBytes("message 5"), tmpRemote);
     Console.WriteLine("Stopping client");
     server.Close();
  }

}

      </source>

Time out Udp Client

<source lang="csharp"> /* C# Network Programming by Richard Blum Publisher: Sybex ISBN: 0782141765

• /

using System; using System.Net; using System.Net.Sockets; using System.Text; public class TimeoutUdpClient {

  public static void Main()
  {
     byte[] data = new byte[1024];
     string input, stringData;
     int recv;
     IPEndPoint ipep = new IPEndPoint(
                     IPAddress.Parse("127.0.0.1"), 9050);
     Socket server = new Socket(AddressFamily.InterNetwork,
                    SocketType.Dgram, ProtocolType.Udp);
     int sockopt = (int)server.GetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReceiveTimeout);
     Console.WriteLine("Default timeout: {0}", sockopt);
     server.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReceiveTimeout, 3000);
     sockopt = (int)server.GetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReceiveTimeout);
     Console.WriteLine("New timeout: {0}", sockopt);
     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[1024];
     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[1024];
        recv = server.ReceiveFrom(data, ref tmpRemote);
        stringData = Encoding.ASCII.GetString(data, 0, recv);
        Console.WriteLine(stringData);
     }
     Console.WriteLine("Stopping client");
     server.Close();
  }

}

      </source>

Udp Client Multi Receive

<source lang="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();
  }

}

      </source>

Udp Client Multi Send

<source lang="csharp"> 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();
  }

}

      </source>

Udp Client Sample

<source lang="csharp"> /* 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();
  }

}

      </source>