/// <summary>
/// This function is called when new data arrives.
/// </summary>
/// <param name="ar"></param>
private static void ReceiveCallback(IAsyncResult ar)
{
SocketState ss = (SocketState)ar.AsyncState;
if (ss.TheSocket.Connected == false)
{
return;
}
try
{
int bytesRead = ss.TheSocket.EndReceive(ar);
// If the socket is still open
if (bytesRead > 0)
{
string theMessage = Encoding.UTF8.GetString(ss.MessageBuffer, 0, bytesRead);
ss.SB.Append(theMessage);
if (ss.CallBackFunction != null)
{
ss.CallBackFunction(ss);
}
}
else
{
ss.ID = 0;
}
}
catch (Exception e)
{
ss.TheSocket.Close();
return;
}
}
/// <summary>
/// A callback invoked when a send operation completes, will invoke a callback function after send end.
/// </summary>
/// <param name="ar"></param>
private static void SendCallbackWithFunc(IAsyncResult ar)
{
SocketState ss = (SocketState)ar.AsyncState;
// Nothing much to do here, just conclude the send operation so the socket is happy.
ss.TheSocket.EndSend(ar);
ss.CallBackFunction(ss);
}
/// <summary>
/// This function is called when the remote site acknowledges connect request
/// </summary>
/// <param name="ar"></param>
private static void ConnectToServer(IAsyncResult ar)
{
SocketState ss = (SocketState)ar.AsyncState;
try
{
// Complete the connection.
ss.TheSocket.EndConnect(ar);
}
catch (Exception e)
{
Debug.WriteLine("Unable to connect to server. Error occured: " + e);
return;
}
if (ss.CallBackFunction != null)
{
ss.CallBackFunction(ss);
}
}