WinUSBNotificationWindow.cs / Asynchronous Operations / By Asaf Shelly

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using System;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using WinUSBDeviceAPI;

namespace WinUSBDevice
{
   public partial class WinUSBNotificationWindow : Form, WinUSBDeviceAPINotification
   {
      public WinUSBNotificationWindow()
      {
         InitializeComponent();
      }

      protected override void WndProc(ref Message msg)
      {
         if (winUsbDeviceApi != null) winUsbDeviceApi.WndProc(ref msg);
         base.WndProc(ref msg);
      }

      private WinUsbDeviceApi winUsbDeviceApi = null;
      public WinUsbDeviceApi WinUsbDevice { get { return winUsbDeviceApi; } }

      WinUSBNotifyDevice winUSBNotifyDevice = null;

      public static WinUSBNotificationWindow NotifierCreate(Guid deviceGuid, WinUSBNotifyDevice deviceEventTarget)
      {
         WinUSBNotificationWindow retval = new WinUSBNotificationWindow();
         retval.winUSBNotifyDevice = deviceEventTarget;
         retval.winUsbDeviceApi = new WinUsbDeviceApi(deviceGuid);
         retval.Show();
         retval.winUsbDeviceApi.Activate(retval);
         retval.Hide();
         return (retval);
      }

      public static void NotifierDestroy(ref WinUSBNotificationWindow notifierWindow)
      {
         if (null == notifierWindow) throw (new InvalidOperationException("WinUSBNotificationWindow.NotifierDestroy called with a null WinUSBNotificationWindow"));
         notifierWindow.Show();
         notifierWindow.winUsbDeviceApi.Deactivate();
         notifierWindow.Hide();
         notifierWindow.Close();
         notifierWindow = null;
      }

      protected ReadCompletionDelegate[] ReadCompletion=new ReadCompletionDelegate[8];
      protected WriteCompletionDelegate[] WriteCompletion=new WriteCompletionDelegate[8];

      public void RegisterReadCompletion(byte endpointNumber, ReadCompletionDelegate readCompletionDelegate)
      {
         if ((endpointNumber < 1) || (endpointNumber > 8)) return;
         ReadCompletion[endpointNumber] += readCompletionDelegate;
      }

      public void UnregisterReadCompletion(byte endpointNumber, ReadCompletionDelegate readCompletionDelegate)
      {
         if ((endpointNumber < 1) || (endpointNumber > 8)) return;
         ReadCompletion[endpointNumber] -= readCompletionDelegate;
      }

      public void RegisterWriteCompletion(byte endpointNumber, WriteCompletionDelegate writeCompletionDelegate)
      {
         if ((endpointNumber < 1) || (endpointNumber > 8)) return;
         WriteCompletion[endpointNumber] += writeCompletionDelegate;
      }

      public void UnregisterWriteCompletion(byte endpointNumber, WriteCompletionDelegate writeCompletionDelegate)
      {
         if ((endpointNumber < 1) || (endpointNumber > 8)) return;
         WriteCompletion[endpointNumber] -= writeCompletionDelegate;
      }

      #region WinUSBDeviceNotification Members

      public void OnDeviceAttach()
      {
         winUSBNotifyDevice.OnDeviceAttach();
      }

      public void OnDeviceDetach()
      {
         winUSBNotifyDevice.OnDeviceDetach();
      }

      public void OnReadCompletion(int ep, byte[] buffer, int lastErrorCode, object userContext)
      {
         if (ReadCompletion[ep] != null) ReadCompletion[ep](buffer, lastErrorCode, userContext);
      }

      public void OnWriteCompletion(int ep, int byteCount, int lastErrorCode, object userContext)
      {
         if (WriteCompletion[ep] != null) WriteCompletion[ep](byteCount, lastErrorCode, userContext);
      }

      #endregion
   }
}