mirror of https://github.com/coolaj86/fizzbuzz.git
169 lines
6.0 KiB
C#
169 lines
6.0 KiB
C#
|
// http://msdn.microsoft.com/en-us/library/fx6588te(v=vs.80).aspx
|
||
|
using System;
|
||
|
using System.Net;
|
||
|
using System.Net.Sockets;
|
||
|
using System.Text;
|
||
|
using System.Threading;
|
||
|
|
||
|
namespace echo
|
||
|
{
|
||
|
// State object for reading client data asynchronously
|
||
|
public class StateObject {
|
||
|
// Client socket.
|
||
|
public Socket workSocket = null;
|
||
|
// Size of receive buffer.
|
||
|
public const int BufferSize = 64 * 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() {
|
||
|
UInt16 port = 11000;
|
||
|
UInt16 maxConnections = 100;
|
||
|
|
||
|
// 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, port);
|
||
|
|
||
|
// 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(maxConnections);
|
||
|
|
||
|
Console.WriteLine("Listening on {0}:{1}", ipAddress, port);
|
||
|
|
||
|
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;
|
||
|
try {
|
||
|
handler.BeginReceive( state.buffer, 0, StateObject.BufferSize, 0,
|
||
|
new AsyncCallback(ReadCallback), state);
|
||
|
} catch(Exception e) {
|
||
|
Console.WriteLine ("oh dear");
|
||
|
Console.WriteLine(e.ToString());
|
||
|
}
|
||
|
}
|
||
|
|
||
|
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;
|
||
|
try {
|
||
|
bytesRead = handler.EndReceive(ar);
|
||
|
} catch (Exception e) {
|
||
|
Console.WriteLine ("Client already disconnected " + e.ToString());
|
||
|
return;
|
||
|
}
|
||
|
|
||
|
if (bytesRead > 0) {
|
||
|
Console.WriteLine ("some bytes read");
|
||
|
// 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);
|
||
|
}
|
||
|
} else {
|
||
|
Console.WriteLine ("0 bytes read");
|
||
|
}
|
||
|
}
|
||
|
|
||
|
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;
|
||
|
}
|
||
|
}
|
||
|
}
|