Programming Discussion Thread - Printable Version

Code:
static public int SendData(ref byte[] buffer, ref Socket socket)

        {

            return SendData(ref buffer, 0, ref socket);

        }

        static public int SendData(ref byte[] buffer, int size, ref Socket socket)

        {

            if (buffer == null || socket == null)

                return -1;



            int ret = 0;



            if (CheckConnection(ref socket))

            {

                if (size == 0)

                {

                    ret = socket.Send(buffer);

                }

                else

                    ret = socket.Send(buffer, size, 0);

            }

            else

                ret = -2;

            return ret;

        }

        static public bool CheckConnection(ref Socket socket)

        {

            if (socket == null)

                return false;



            try

            {

                //if the socket says connected we test it to check if its true or not. C# likes saying its connected while its not it seems...

                //if it says not connected then its clearly not connected

                if (socket.Connected)

                {

                    //poll the connection. the poll will return true if :

                    // - a connection is pending

                    // - data is available for reading

                    // - connection is closed or unavailable

                    //

                    // so if it returns false, the connection is there but nothing can be read

                    // if its true, we need to check if we can read data. if we can't, its either pending (useless) or closed (even more useless)

                    // so we mark it as closed.

                    bool bpoll = false;

                    bpoll = socket.Poll(0, SelectMode.SelectRead);

                    if (bpoll)

                    {

                        byte[] buff = new byte[1];

                        int recv_value = socket.Receive(buff, SocketFlags.Peek);

                        if (recv_value <= 0)

                        {

                            // Client disconnected

                            return false;

                        }

                    }

                }

                else

                    return false;



            }

            catch (SocketException ex)

            {

                //something went wrong. im guessing connection is closed but meh. lets just assume connection is a no go

                return false;

            }

            return true;

        }