private void ReceiveCallback(IAsyncResult ar)
{
try
{
if (_receiveSocket.EndReceive(ar) > 1)
{
_buffer = new byte[BitConverter.ToInt32(_buffer, 0)];
_receiveSocket.Receive(_buffer, _buffer.Length, SocketFlags.None);
//everything is received, now we convert the data:
string data = Encoding.Default.GetString(_buffer);
// raise the received package data with appropriate context information
PackageReceivedEventArgs eventArgs = new PackageReceivedEventArgs {
Data = data, Id = Id, Socket = _receiveSocket
};
PackageReceivedHandler.OnReceivePackage(this, eventArgs);
}
else
{
Disconnect();
}
}
catch
{
if (!_receiveSocket.Connected)
{
Disconnect();
}
else
{
StartReceiving();
}
}
StartReceiving();
}
public static void ReceivePackage(Object o, PackageReceivedEventArgs args)
{
Dictionary <string, object> pdict = JsonConvert.DeserializeObject <Dictionary <string, object> >(args.Data);
if ((string)pdict["type"] == "REQUEST_STATUS")
{
//if the client is requesting the current state of the whiteboard
Client c = ClientController.ClientList[0]; //the "host" client
PacketSender sender = new PacketSender(c.Socket);
sender.Send(args.Data);
}
else if ((string)pdict["type"] == "RESTORE")
{
//transfer the current state of the whiteboard to the client who
//requested it
int id = int.Parse(pdict["client_id"].ToString());
Client c = ClientController.ClientList[id];
PacketSender sender = new PacketSender(c.Socket);
sender.Send(args.Data);
}
else
{
//if a new shape is drawn, we simply need to transfer it to the clients
foreach (Client c in ClientController.ClientList)
{
if (c.Id != args.Id)
{
PacketSender sender = new PacketSender(c.Socket);
sender.Send(args.Data);
}
else
{
continue;
}
}
}
}