/// <summary>
/// This function is "called" by the operating system when data arrives on the socket
/// </summary>
/// <param name="ar"></param>
private static void ReceiveCallback(IAsyncResult ar)
{
SocketState ss = (SocketState)ar.AsyncState;
ss.Connected = true;
int bytesRead = 0;
try
{
bytesRead = ss.theSocket.EndReceive(ar);
// If the socket is still open
if (bytesRead > 0)
{
string theMessage = Encoding.UTF8.GetString(ss.messageBuffer, 0, bytesRead);
// Append the received data to the growable buffer.
// It may be an incomplete message, so we need to start building it up piece by piece
ss.sb.Append(theMessage);
ss._call(ss);
}
else
{
DisconnectError(ss, "Stopped getting data from server");
ss.theSocket.Close();
}
}
catch (Exception e)
{
// set the connection to false to
ss.Connected = false;
// trigger a disconnect event that passes in a socket state. Calling it here because this seems to be where
// exceptions are thrown after a disconnect.
DisconnectError(ss, e.Message);
}
}
/// <summary>
/// The function that continues the event loop for each new client connection
/// </summary>
/// <param name="ar"></param>
public static void AcceptNewClient(IAsyncResult ar)
{
ListenerState ls = (ListenerState)ar.AsyncState;
Socket socket = ls.listener.EndAcceptSocket(ar);
SocketState ss = new SocketState(socket, ls._call, ls.ID);
ss._call(ss);
ls.ID++;
ls.listener.BeginAcceptSocket(AcceptNewClient, ls);
}
/// <summary>
/// This function is "called" by the operating system when the remote site acknowledges the connect request
/// </summary>
/// <param name="ar"></param>
private static void ConnectedCallback(IAsyncResult ar)
{
SocketState ss = (SocketState)ar.AsyncState;
// Complete the connection.
try
{
ss.theSocket.EndConnect(ar);
ss._call(ss);
}
catch (Exception e)
{
System.Diagnostics.Debug.WriteLine(e.Message);
}
}