using System;

 using System.Windows.Forms;

 using System.Runtime.InteropServices;

 using System.Diagnostics;

 using System.Text;

 using Microsoft.Win32.SafeHandles;

 using Win32;

 using System.Collections.Generic;

 namespace Hid

 {

     /// <summary>

     /// Our HID handler manages raw input registrations, processes WM_INPUT messages and broadcasts HID events in return.

     /// </summary>

     public class HidHandler

     {

         public delegate void HidEventHandler(object aSender, HidEvent aHidEvent);

         public event HidEventHandler OnHidEvent;

         List<HidEvent> iHidEvents;

         public bool IsRegistered { get; private set; }

         public HidHandler(RAWINPUTDEVICE[] aRawInputDevices)

         {

             iHidEvents=new List<HidEvent>();

             IsRegistered = Function.RegisterRawInputDevices(aRawInputDevices, (uint)aRawInputDevices.Length, (uint)Marshal.SizeOf(aRawInputDevices[0]));

         }

         public void ProcessInput(Message aMessage)

         {

             Hid.HidEvent hidEvent = new Hid.HidEvent(aMessage, OnHidEventRepeat);

             hidEvent.DebugWrite();

             if (!hidEvent.IsValid || !hidEvent.IsGeneric)

             {

                 Debug.WriteLine("Skipping HID message.");

                 return;

             }

             //

             if (hidEvent.Usages[0] == 0)

             {

                 //This is a key up event

                 //We need to discard any events belonging to the same page and collection

                 for (int i = (iHidEvents.Count-1); i >= 0; i--)

                 {

                     if (iHidEvents[i].UsageId == hidEvent.UsageId)

                     {

                         iHidEvents[i].Dispose();

                         iHidEvents.RemoveAt(i);

                     }

                 }

             }

             else

             {

                 //Keep that event until we get a key up message

                 iHidEvents.Add(hidEvent);

             }

             //Broadcast our events

             OnHidEvent(this, hidEvent);    

         }

         public void OnHidEventRepeat(HidEvent aHidEvent)

         {

             //Broadcast our events

             OnHidEvent(this, aHidEvent);    

         }

     }

 }