/// <summary>
/// Send a message to the server that needs to be broadcast to all other clients
/// </summary>
/// <param name="path">the path drawn on the client's DrawingBox that will be relayed to other clients</param>
public void sendMessage(string path)
{
// prepare the data by converting the message informatino into a byte array
byte[] data = (new TFMS_Data(TFMS_Command.Message, path, strName)).ToByte();
TFMS_Data lenToSend = new TFMS_Data(TFMS_Command.MsgLen, string.Format("{0}", data.Length), strName);
// send the message to the socket
clientSocket.Send(lenToSend.ToByte());
Thread.Sleep(TFMS_Constants.DELAY_TIME);
// begin sending the message to the server
clientSocket.BeginSend(data, 0, data.Length, SocketFlags.None, new AsyncCallback(OnSend), null);
}
/// <summary>
/// When the server receives a message from a client, it rebroadcasts the message to all other clients
/// This method sends the message to a single client
/// </summary>
/// <param name="data">TFMS_Data object to be sent</param>
/// <param name="socket">Socket belonging to the target client</param>
/// <param name="send">function to be called when the message is done sending (should be "onSend")</param>
/// <returns>the result of sending the message to the target client</returns>
private IAsyncResult sendTFMSmsg(TFMS_Data data, Socket socket, AsyncCallback send)
{
// get the byte array of the TFMS_Data object
byte[] message = data.ToByte();
Console.WriteLine("Sending length: {0}", message.Length);
// syncronously send the length of the actual message and block until the message has been sent.
socket.Send(new TFMS_Data(TFMS_Command.MsgLen, string.Format("{0}", message.Length), data.strName).ToByte());
Console.WriteLine("BeginSend: {0} msg", data.cmdCommand);
// the async call to send the message
// returns an IAsyncResult object
return socket.BeginSend(message, 0, message.Length, SocketFlags.None, send, socket);
}
/// <summary>
/// Attempt to connect to the server at the specified IP address
/// </summary>
/// <param name="IP_address">the IP address of the target server ("a.b.c.d" format)</param>
/// <returns>true if the connection was succesful, otherwise false</returns>
public bool connect(string IP_address)
{
try
{
// create the socket
clientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
// get the IP addresses, then connect them with the socket
IPAddress serverip = IPAddress.Parse(IP_address);
IPEndPoint ipEnd = new IPEndPoint(serverip, serverPort);
clientSocket.Connect(ipEnd);
// try to login after connecting to the server
TFMS_Data msgToSend = new TFMS_Data(TFMS_Command.Login, null, strName);
clientSocket.Send(msgToSend.ToByte());
// setup buffer to receive data from the server
byteData = new byte[TFMS_Constants.BUFFER_SIZE];
// start listening to the data asynchronously
clientSocket.BeginReceive(byteData, 0, byteData.Length, SocketFlags.None, new AsyncCallback(OnReceive), null);
// the client successfully connected
Console.WriteLine("{0} successfully connected to the server!", msgToSend.strName);
return true;
}
catch (Exception)
{
// the client failed to connect
Console.WriteLine("Client at '{0}' failed to connect to the server!", IP_address);
return false;
}
}
