Esempio n. 1
0
        /// <summary>
        /// Main receiver thread for this com port instance.
        /// </summary>
        private void ReceiveThread()
        {
            // Create locals.
            uint firedEvent = 0;
            uint nBytes     = 0;

            byte[] buf = new Byte[1];

            // Create thread signal (initial state is non-signaled).
            AutoResetEvent signal = new AutoResetEvent(false);

            // Create overlap memory pointer. Install signal.
            this.rxOvr = new Win32Ovrlap(port.Handle, signal.Handle);

            // Instantiate the event class.
            this.events = new Win32Events(rxOvr.MemPtr);

            // Instantiate the modem signal class.
            this.modem = new Win32Modem();

            // Set initial modem signal states.
            this.Signals();

            // Signal the main thread that
            // the receive thread is started.
            this.recvrEvent.Set();

            try
            {
                while (true)
                {
                    // Arm the event monitoring mask.
                    // if(this.events.Set(this.port.Handle, Win32Events.EV_DEFAULT))
                    if (this.events.Set(this.port.Handle, Win32Events.EV_TXEMPTY))
                    {
                        // Wait for any armed event to occur.
                        this.events.Wait(this.port.Handle, signal);

                        // Get mask of fired events.
                        firedEvent = this.events.GetMask;

                        // Error event (override).
                        if ((firedEvent & Win32Events.EV_ERR) != 0)
                        {
                            if (this.stats.Reset(this.port.Handle) == false)
                            {
                                if (this.stats.Status == Win32Status.CE_BREAK)
                                {
                                    firedEvent &= ~Win32Events.EV_BREAK;
                                }
                                else
                                {
                                    this.CommError(this.stats.Fault);
                                }
                            }
                        }
                        else
                        {
                            // Receive event (override).
                            if (((firedEvent & Win32Events.EV_RXCHAR) != 0) && (this.immediate))
                            {
                                do
                                {
                                    nBytes = 0;
                                    if (this.port.Read(buf, 1, out nBytes, this.rxOvr.MemPtr))
                                    {
                                        if (nBytes == 1)
                                        {
                                            this.OnRxChar(buf);
                                        }
                                    }
                                } while(nBytes > 0);
                            }

                            // TX queue empty event (override).
                            if ((firedEvent & Win32Events.EV_TXEMPTY) != 0)
                            {
                                this.OnTxDone();
                            }

                            // Line break event (override).
                            if ((firedEvent & Win32Events.EV_BREAK) != 0)
                            {
                                this.OnBreak();
                            }

                            // Modem signal change event(s) (override).
                            if ((firedEvent & Win32Events.EV_MODEM) > 0)
                            {
                                this.modem.Get(this.port.Handle);
                                if ((firedEvent & Win32Events.EV_CTS) > 0)
                                {
                                    this.OnCTS(this.modem.CtsState);
                                }
                                if ((firedEvent & Win32Events.EV_DSR) > 0)
                                {
                                    this.OnDSR(this.modem.DsrState);
                                }
                                if ((firedEvent & Win32Events.EV_RLSD) > 0)
                                {
                                    this.OnRLSD(this.modem.RlsdState);
                                }
                                if ((firedEvent & Win32Events.EV_RING) > 0)
                                {
                                    this.OnRING(this.modem.RingState);
                                }
                            }
                        }
                    }
                }
            }
            catch (Exception e)
            {
                if ((e is ThreadAbortException))
                {
                    this.modem  = null;
                    this.events = null;
                    this.rxOvr  = null;
                }
                else
                {
                    this.CommError("Receiver Exception: " + e.Message);
                }
            }
        }
Esempio n. 2
0
		/// <summary>
		/// Main receiver thread for this com port instance.
		/// </summary>
		private void ReceiveThread()
		{
			// Create locals.
			uint firedEvent = 0;
			uint nBytes = 0;
			byte[] buf = new Byte[1];

			// Create thread signal (initial state is non-signaled). 
			AutoResetEvent signal = new AutoResetEvent(false);

			// Create overlap memory pointer. Install signal.
			this.rxOvr = new Win32Ovrlap(port.Handle, signal.Handle);

			// Instantiate the event class.
			this.events = new Win32Events(rxOvr.MemPtr);

			// Instantiate the modem signal class.
			this.modem = new Win32Modem();

			// Set initial modem signal states.
			this.Signals();

			// Signal the main thread that 
			// the receive thread is started.
			this.recvrEvent.Set();

			try
			{
				while(true) 
				{
					// Arm the event monitoring mask.
					// if(this.events.Set(this.port.Handle, Win32Events.EV_DEFAULT))
					if(this.events.Set(this.port.Handle, Win32Events.EV_TXEMPTY))
					{
						// Wait for any armed event to occur.
						this.events.Wait(this.port.Handle, signal);

						// Get mask of fired events.
						firedEvent = this.events.GetMask;

						// Error event (override).
						if((firedEvent & Win32Events.EV_ERR) != 0)
						{
							if(this.stats.Reset(this.port.Handle) == false)
							{
								if(this.stats.Status == Win32Status.CE_BREAK)
								{
									firedEvent &= ~Win32Events.EV_BREAK;
								}
								else
								{
									this.CommError(this.stats.Fault);
								}
							}
						}
						else
						{
							// Receive event (override).
							if(((firedEvent & Win32Events.EV_RXCHAR) != 0) && (this.immediate))
							{
								do 
								{
									nBytes = 0;
									if(this.port.Read(buf, 1, out nBytes, this.rxOvr.MemPtr)) 
									{
										if(nBytes == 1)
											this.OnRxChar(buf);
									}
								} while(nBytes > 0);
							}

							// TX queue empty event (override).
							if((firedEvent & Win32Events.EV_TXEMPTY) != 0)
								this.OnTxDone();

							// Line break event (override).
							if((firedEvent & Win32Events.EV_BREAK) != 0)
								this.OnBreak();

							// Modem signal change event(s) (override).
							if((firedEvent & Win32Events.EV_MODEM) > 0)
							{
								this.modem.Get(this.port.Handle);
								if((firedEvent & Win32Events.EV_CTS) > 0)
									this.OnCTS(this.modem.CtsState);
								if((firedEvent & Win32Events.EV_DSR) > 0)
									this.OnDSR(this.modem.DsrState);
								if((firedEvent & Win32Events.EV_RLSD) > 0)
									this.OnRLSD(this.modem.RlsdState);
								if((firedEvent & Win32Events.EV_RING) > 0)
									this.OnRING(this.modem.RingState);
							}
						}
					}					
				}
			}
			catch(Exception e)
			{
				if((e is ThreadAbortException))
				{
					this.modem = null;
					this.events = null;
					this.rxOvr = null;
				}
				else
				{
					this.CommError("Receiver Exception: " + e.Message);
				}
			}
		}