public void StartListening()
{
Socket srvr_listenersoc = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
IPEndPoint srvr_ep = new IPEndPoint(IPAddress.Parse(ipAddr), portNumber);
srvr_listenersoc.Bind(srvr_ep);
srvr_listenersoc.Listen(100);
theState = new TCPState(srvr_listenersoc);
Console.WriteLine("server set, waiting for connectoin");
try
{
while (listening)
{
connectionStablished.Reset();
srvr_listenersoc.BeginAccept(new AsyncCallback(AcceptCallback), srvr_listenersoc);
connectionStablished.WaitOne();
Console.WriteLine("connection accepted by server");
}
}
catch (Exception e)
{
Console.WriteLine(e.ToString());
StartListening();
}
}
private void ConnectionCallback(IAsyncResult ar)
{
connectionStablished.Set();
Console.WriteLine("Connection stablished");
isConnected = true;
TCPState state = (TCPState)ar.AsyncState;
StartReceiving(state);
}
private void SendCallback(IAsyncResult ar)
{
try
{
TCPState state = (TCPState)ar.AsyncState;
int bytesSent = state.workSocket.EndSend(ar);
}
catch (Exception e)
{
Console.WriteLine(e.ToString());
}
}
protected override void ReceiveCallback(IAsyncResult ar)
{
String content = String.Empty;
TCPState state = (TCPState)ar.AsyncState;
Socket handler = state.workSocket;
int bytesRead = handler.EndReceive(ar);
if (bytesRead > 0)
{
state.sb.Append(Encoding.ASCII.GetString(state.buffer, 0, bytesRead));
content = state.sb.ToString();
int indexOfEOF = content.IndexOf("<EOF>");
if (indexOfEOF > -1)
{
// A mssg is received
content = content.Substring(0, indexOfEOF);
if (conIndex != -1)
{
OnReceivedDataHandler(content);
state.sb.Clear();
}
else
{
try
{
Console.WriteLine("received first packet");
conIndex = Convert.ToInt32(content);
OnConnectedHandler(conIndex + "");
}
catch { }
}
// start receiving the next message
StartReceiving(state);
}
else
{
StartReceiving(state);
}
}
else
{
// It's theoritically not possible to get here but I put it here just in case
StartReceiving(state);
}
}
public void StartConnection()
{
Socket cli_connection = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
IPEndPoint srvr_ep = new IPEndPoint(IPAddress.Parse(ipAddr), portNumber);
theState = new TCPState(cli_connection);
try
{
connectionStablished.Reset();
cli_connection.BeginConnect(srvr_ep, new AsyncCallback(ConnectionCallback), theState);
connectionStablished.WaitOne();
}
catch (Exception e)
{
Console.WriteLine(e.ToString());
}
}
private void AcceptCallback(IAsyncResult ar)
{
connectionStablished.Set();
Socket listener = (Socket)ar.AsyncState;
Socket handler = listener.EndAccept(ar);
TCPState conState = new TCPState(handler);
connectionsState.Add(conState);
int conIndex = connectionsState.Count - 1;
SendMessage_(conIndex + "", conIndex);
OnConnectedHandler(conIndex + "");
StartReceiving(conState);
}
private void StartReceiving(TCPState state)
{
state.workSocket.BeginReceive(state.buffer, 0, TCPState.BufferSize, 0, new AsyncCallback(ReceiveCallback), state);
}