/// <summary>
/// Starts recieving data on an open socket.
/// </summary>
/// <param name="socket">The socket to recieve data on.</param>
/// <param name="port">The port to recieve data on.</param>
protected void StartRecieve(Socket socket, int port)
{
try
{
EndPoint localPort = new IPEndPoint(IPAddress.Any, port);
DJTapRecieveData recieveState = new DJTapRecieveData()
{
Socket = socket,
Port = port
};
recieveState.SetLength(1500);
socket.BeginReceiveFrom(recieveState.GetBuffer(), 0, (int)recieveState.Length, SocketFlags.None, ref localPort, new AsyncCallback(OnRecieve), recieveState);
}
catch (Exception ex)
{
OnUnhandledException(new ApplicationException("An error ocurred while trying to start recieving ArtNet.", ex));
}
}
/// <summary>
/// Called when when new data is recieved on a socket.
/// </summary>
/// <param name="state">The recieve data for this transaction.</param>
private void OnRecieve(IAsyncResult state)
{
EndPoint remoteEndPoint = new IPEndPoint(IPAddress.Any, 0);
if (PortOpen)
{
DJTapRecieveData recieveState = (DJTapRecieveData)(state.AsyncState);
if (recieveState != null)
{
try
{
recieveState.SetLength((recieveState.Length - recieveState.ReadNibble) + recieveState.Socket.EndReceiveFrom(state, ref remoteEndPoint));
//Protect against UDP loopback where we recieve our own packets.
if (LocalEndPoint != remoteEndPoint && recieveState.Valid)
{
LastPacket = DateTime.UtcNow;
DJTapPacket newPacket;
while (DJTapPacketBuilder.TryBuild(recieveState, (DateTime)LastPacket, out newPacket))
{
recieveState.ReadPosition = (int)recieveState.Position;
//Packet has been read successfully.
if (NewPacket != null)
{
NewPacket(this, new NewPacketEventArgs <DJTapPacket>((IPEndPoint)remoteEndPoint, newPacket));
}
}
}
}
catch (Exception ex)
{
OnUnhandledException(ex);
}
finally
{
//Attempt to recieve another packet.
StartRecieve(recieveState.Socket, recieveState.Port);
}
}
}
}