Retry Udp Client
/* 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(); } }