/// <summary>
/// Callback for the send function. Reads in the byte data, converts it to a string,
/// appends the previous data, converts it back to bytes, and continues sending.
/// When done, it closes the socket connection.
/// </summary>
/// <param name="ar"></param>
private static void SendCallback(IAsyncResult ar)
{
Preserved_Socket_State state = (Preserved_Socket_State)ar.AsyncState;
Socket socket = state.workSocket;
byte[] stateBuffer = state.buffer;
int bytes = socket.EndSend(ar);
if (bytes == 0)
{
socket.Close();
}
else
{
outgoing = encoding.GetString(stateBuffer, bytes,
stateBuffer.Length - bytes) + outgoing;
if (outgoing != String.Empty)
{
byte[] outgoingBuffer = encoding.GetBytes(outgoing);
state.buffer = outgoingBuffer;
outgoing = String.Empty;
socket.BeginSend(outgoingBuffer, 0, outgoingBuffer.Length,
SocketFlags.None, SendCallback, state);
}
}
}
/// <summary>
/// Function that gets called when we want to send information to the server,
/// such as sending the player name and sending move/split commands.
/// </summary>
/// <param name="socket"></param>
/// <param name="data"></param>
public static void Send(Socket socket, String message)
{
Preserved_Socket_State state = new Preserved_Socket_State();
state.workSocket = socket;
state.buffer = encoding.GetBytes(message);
socket.BeginSend(state.buffer, 0, state.buffer.Length,
SocketFlags.None, SendCallback, state);
}
/// <summary>
/// Function that happens every time we want more data. Starts receiving from the server.
/// </summary>
/// <param name="state"></param>
public static void i_want_more_data(Preserved_Socket_State state)
{
try
{
state.workSocket.BeginReceive(state.buffer, 0, Preserved_Socket_State.bufferSize,
SocketFlags.None, ReceiveCallback, state);
}
catch (Exception e)
{
// state.errorMessage = "I Want More Data: " + e.Message;
//state.callback.DynamicInvoke(state);
}
}
/// <summary>
/// Function that gets called when we have received data from the server.
/// </summary>
/// <param name="state_in_an_ar_object"></param>
public static void ReceiveCallback(IAsyncResult state_in_an_ar_object)
{
Preserved_Socket_State state = (Preserved_Socket_State)state_in_an_ar_object.AsyncState;
Socket client = state.workSocket;
int bytesRead = client.EndReceive(state_in_an_ar_object);
if (bytesRead > 0)
{
state.bytesRead = bytesRead;
state.callback.DynamicInvoke(state);
}
else
{
client.Close();
}
}
/// <summary>
/// Function that gets called when the user establishes a connection to the server.
/// </summary>
/// <param name="state_in_an_ar_object"></param>
public static void Connected_to_Server(IAsyncResult state_in_an_ar_object)
{
Preserved_Socket_State state = (Preserved_Socket_State)state_in_an_ar_object.AsyncState;
Socket connection = state.workSocket;
try
{
//TODO: I moved this down here so that it would catch the error,
// but it needs to be handled with a message.
connection.EndConnect(state_in_an_ar_object);
state.callback.DynamicInvoke(state);
connection.BeginReceive(state.buffer, 0, Preserved_Socket_State.bufferSize,
SocketFlags.None, ReceiveCallback, state);
}
catch (Exception e)
{
connection.Close();
}
}
/// <summary>
/// Function that gets called when the user needs to connect to the server.
/// </summary>
/// <param name="callback"></param>
/// <param name="hostname"></param>
/// <returns></returns>
public static Socket Connect_to_Server(Delegate callback, string hostname)
{
try
{
Preserved_Socket_State ps = new Preserved_Socket_State();
IPHostEntry he = Dns.GetHostEntry(hostname);
IPAddress ip = he.AddressList[0];
IPEndPoint ep = new IPEndPoint(ip, port);
Socket connection = new Socket(ip.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
ps.callback = callback;
ps.workSocket = connection;
connection.BeginConnect(ep, Connected_to_Server, ps);
return(connection);
}
catch (Exception e)
{
//ps.errorMessage = "Problem connecting.";
//ps.callback.DynamicInvoke(ps);
}
return(null);
}
