/// <summary>
/// Callback Method that is called each time a packet form the connected socket is received
/// </summary>
/// <param name="asyn"></param>
private void ReceiveCallback(IAsyncResult asyn)
{
try
{
//Get the current packet
ReceivedSocketPacket receivedSocketPacket = (ReceivedSocketPacket)asyn.AsyncState;
//Get the packet socket
Socket client = receivedSocketPacket.workSocket;
//Get the number of bytes received
int bytesRead = receivedSocketPacket.workSocket.EndReceive(asyn);
if (bytesRead > 0)
{
//Copy the read bytes from the packet buffer into the processing buffer
lock (thisLock)
{
messageBufer.Append(Encoding.ASCII.GetString(receivedSocketPacket.buffer, 0, bytesRead));
}
//Process the message buffer tois extract all the received messages
ProcessMessageBuffer();
StartReceivingPackets();
}
else
{
StartReceivingPackets();
}
}
catch (ObjectDisposedException)
{
//This is good error (when the socket closes an error that states that the deposed object can't be accesed is triggered)
//Never foud a clean close solution
}
catch (SocketException ex)
{
Log.Error(C3NET_COMMUNICATOR_LOG, string.Format("ReceiveCallback : {0}", ex.ToString()));
}
}
/// <summary>
///
/// </summary>
/// <returns></returns>
private bool StartReceivingPackets()
{
try
{
//Create the socket packet and assign a socket to it
ReceivedSocketPacket receivedSocketPacket = new ReceivedSocketPacket();
receivedSocketPacket.workSocket = connectedSocket;
//Init the CallBack method that will wait for received messages
if (asyncReceiveCallBack == null)
{
asyncReceiveCallBack = new AsyncCallback(ReceiveCallback);
}
//Start accepting packets
if (!WasDisconnected)
{
connectedSocket.BeginReceive(receivedSocketPacket.buffer, 0, ReceivedSocketPacket.BufferSize, SocketFlags.None, asyncReceiveCallBack, receivedSocketPacket);
}
//Change the connected flag if the socket is connected to the EndPoint
WasConnected = true;
return(true);
}
catch (ObjectDisposedException)
{
//This is good error (when the socket closes an error that states that the deposed object can't be accesed is triggered)
//Never foud a clean close solution
}
catch (Exception ex)
{
//If the socket is already closed it's normal for the StartPacketReceiving to fail
if (!WasDisconnected)
{
//If there is an error when packet receival method is called the communication will be considered down
WasDisconnected = true;
waitForConnectionTimer.Stop();
Disconnect();
var win32Exception = ex as Win32Exception;
if (win32Exception == null)
{
win32Exception = ex.InnerException as Win32Exception;
}
if (win32Exception != null)
{
int code = win32Exception.ErrorCode;
if (code == 10057)
{
Log.Error(C3NET_COMMUNICATOR_LOG, "Socket was closed.");
}
else
{
Log.Error(C3NET_COMMUNICATOR_LOG, string.Format("Start Receiving Packets Failed: {0}", ex.Message));
}
}
else
{
Log.Error(C3NET_COMMUNICATOR_LOG, string.Format("Start Receiving Packets Failed: {0}", ex.Message));
}
}
}
return(false);
}