/ayncio/ayncio/Program.cs
C# | 169 lines | 108 code | 29 blank | 32 comment | 3 complexity | 0cd65e200f28fcf652d0b9ab0d8b274f MD5 | raw file
- using System;
- using System.Net;
- using System.Net.Sockets;
- using System.Text;
- using System.Threading;
- // State object for reading client data asynchronously
- public class StateObject
- {
- // Client socket.
- public Socket workSocket = null;
- // Size of receive buffer.
- public const int BufferSize = 1024;
- // Receive buffer.
- public byte[] buffer = new byte[BufferSize];
- // Received data string.
- public StringBuilder sb = new StringBuilder();
- }
- public class AsynchronousSocketListener
- {
- // Thread signal.
- public static ManualResetEvent allDone = new ManualResetEvent(false);
- public AsynchronousSocketListener()
- {
- }
- public static void StartListening()
- {
- // Data buffer for incoming data.
- byte[] bytes = new Byte[1024];
- // Establish the local endpoint for the socket.
- // The DNS name of the computer
- // running the listener is "host.contoso.com".
- IPHostEntry ipHostInfo = Dns.Resolve(Dns.GetHostName());
- IPAddress ipAddress = ipHostInfo.AddressList[0];
- IPEndPoint localEndPoint = new IPEndPoint(ipAddress, 11000);
- // Create a TCP/IP socket.
- Socket listener = new Socket(AddressFamily.InterNetwork,
- SocketType.Stream, ProtocolType.Tcp);
- // Bind the socket to the local endpoint and listen for incoming connections.
- try
- {
- listener.Bind(localEndPoint);
- listener.Listen(100);
- while (true)
- {
- // Set the event to nonsignaled state.
- allDone.Reset();
- // Start an asynchronous socket to listen for connections.
- Console.WriteLine("Waiting for a connection...");
- listener.BeginAccept(
- new AsyncCallback(AcceptCallback),
- listener);
- // Wait until a connection is made before continuing.
- allDone.WaitOne();
- }
- }
- catch (Exception e)
- {
- Console.WriteLine(e.ToString());
- }
- Console.WriteLine("\nPress ENTER to continue...");
- Console.Read();
- }
- public static void AcceptCallback(IAsyncResult ar)
- {
- // Signal the main thread to continue.
- allDone.Set();
- // Get the socket that handles the client request.
- Socket listener = (Socket)ar.AsyncState;
- Socket handler = listener.EndAccept(ar);
- // Create the state object.
- StateObject state = new StateObject();
- state.workSocket = handler;
- handler.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,
- new AsyncCallback(ReadCallback), state);
- }
- public static void ReadCallback(IAsyncResult ar)
- {
- String content = String.Empty;
- // Retrieve the state object and the handler socket
- // from the asynchronous state object.
- StateObject state = (StateObject)ar.AsyncState;
- Socket handler = state.workSocket;
- // Read data from the client socket.
- int bytesRead = handler.EndReceive(ar);
- if (bytesRead > 0)
- {
- // There might be more data, so store the data received so far.
- state.sb.Append(Encoding.ASCII.GetString(
- state.buffer, 0, bytesRead));
- // Check for end-of-file tag. If it is not there, read
- // more data.
- content = state.sb.ToString();
- if (content.IndexOf("<EOF>") > -1)
- {
- // All the data has been read from the
- // client. Display it on the console.
- Console.WriteLine("Read {0} bytes from socket. \n Data : {1}",
- content.Length, content);
- // Echo the data back to the client.
- Send(handler, content);
- }
- else
- {
- // Not all data received. Get more.
- handler.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0,
- new AsyncCallback(ReadCallback), state);
- }
- }
- }
- private static void Send(Socket handler, String data)
- {
- // Convert the string data to byte data using ASCII encoding.
- byte[] byteData = Encoding.ASCII.GetBytes(data);
- // Begin sending the data to the remote device.
- handler.BeginSend(byteData, 0, byteData.Length, 0,
- new AsyncCallback(SendCallback), handler);
- }
- private static void SendCallback(IAsyncResult ar)
- {
- try
- {
- // Retrieve the socket from the state object.
- Socket handler = (Socket)ar.AsyncState;
- // Complete sending the data to the remote device.
- int bytesSent = handler.EndSend(ar);
- Console.WriteLine("Sent {0} bytes to client.", bytesSent);
- handler.Shutdown(SocketShutdown.Both);
- handler.Close();
- }
- catch (Exception e)
- {
- Console.WriteLine(e.ToString());
- }
- }
- public static int Main(String[] args)
- {
- StartListening();
- return 0;
- }
- }