Example #1
0
        /// Last Modified: 10/24/10
        /// <summary>
        /// A static method that will send packet information
        ///  to the IPEndpoint supplied.  This method is blocking
        ///  and does not support asynchronous sending of information.
        /// </summary>
        /// -----------------------------------------------------
        /// PRECONDITIONS: NA -- No preconditions exist.
        /// -----------------------------------------------------
        /// Parameters:
        /// <param name="p">
        /// A packet of information to send.
        /// </param>
        /// <param name="ipep">
        /// The destination endpoint to send the packet.
        /// </param>
        /// -----------------------------------------------------
        /// POSTCONDITIONS: The message will be sent or an exception will have been thrown.
        /// -----------------------------------------------------
        /// Exceptions:
        /// 1) NodeSocketInvalid
        /// 2) NodeUnknownException
        /// -----------------------------------------------------
        /// Return Value:
        public void SendTo(Packet p, IPEndPoint ipep)
        {
            Socket s = null;

            try
            {
                //Create the socket to send information to.
                s = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);

                //Cast the endpoint.
                EndPoint ep = (EndPoint)ipep;

                //Perform any necessary encryptions based on the security model.
                byte[] byData = (m_nodeSecurityModel != null)
                    ? m_nodeSecurityModel.ByteEncrypt(p.ToByteArray())
                        : p.ToByteArray();

                //Marshall the string data into a byte stream and send the data.
                s.SendTo(byData, SocketFlags.None, ep);
            }
            catch (ObjectDisposedException ode)
            {
                throw new NodeSocketInvalid("The Socket has been closed. ", ode);
            }
            catch (SocketException se)
            {
                //MSDN NOTE: If you receive a SocketException, use the SocketException.ErrorCode property to obtain the specific error code.
                // After you have obtained this code, refer to the Windows Sockets version 2 API error code documentation in the MSDN library
                //for a detailed description of the error.
                throw new NodeSocketInvalid(se.Message, se);
            }
            catch (Exception ex)
            {
                //Call the error callback if one exists.
                throw new NodeUnknownException(ex.Message, ex);
            }
            finally
            {
                //Close the socket.
                s.Close();
            }
        }
Example #2
0
        /// Last Modified: 11/28/09
        /// <summary>
        /// Starts the sending the packet.
        /// </summary>
        /// -----------------------------------------------------
        /// PRECONDITIONS: Refer to the following arguments:
        /// -----------------------------------------------------
        /// Parameters:
        /// -----------------------------------------------------
        /// POSTCONDITIONS: NA -- No postconditions exist.
        /// -----------------------------------------------------
        /// Return Value:
        public void AsynchSend(Packet p, IPEndPoint ipep)
        {
            //Avoid invalid socket access.
            if (m_Socket == null) return;

            //Prepare the state object.
            StateObject state = new StateObject();
            state.socket = m_Socket;
            state.iep = ipep;
            state.buffer = p.ToByteArray();

            //Begin sending the packet information.
            m_Socket.BeginSendTo(state.buffer, 0, StateObject.BUFFER_SIZE,
                SocketFlags.None, (EndPoint)ipep,
                new AsyncCallback(OnSendCallback),
                state);
        }