using System;

 using System.IO;

 using System.Collections.Generic;

 using System.Linq;

 using System.Text;

 using System.Threading.Tasks;

 using System.Diagnostics;

 using System.Runtime.InteropServices;

 using System.Windows.Forms;

 //

 using Hid = SharpLib.Hid;

 using SharpLib.Win32;

 namespace SharpDisplayManager

 {

     /// <summary>

     /// Implement handling of HID input reports notably to be able to launch an application using the Green Start button from IR remotes.

     /// </summary>

     [System.ComponentModel.DesignerCategory("Code")]

     public class MainFormHid : Form

     {

         [System.Runtime.InteropServices.DllImportAttribute("user32.dll", EntryPoint = "SwitchToThisWindow")]

         public static extern void SwitchToThisWindow([System.Runtime.InteropServices.InAttribute()] System.IntPtr hwnd, [System.Runtime.InteropServices.MarshalAsAttribute(System.Runtime.InteropServices.UnmanagedType.Bool)] bool fUnknown);

         //

         public delegate void OnHidEventDelegate(object aSender, Hid.Event aHidEvent);

         /// <summary>

         /// Use notably to handle green start key from IR remote control

         /// </summary>

         private Hid.Handler iHidHandler;

         /// <summary>

         /// Register HID devices so that we receive corresponding WM_INPUT messages.

         /// </summary>

         protected void RegisterHidDevices()

         {

             // Register the input device to receive the commands from the

             // remote device. See http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnwmt/html/remote_control.asp

             // for the vendor defined usage page.

             RAWINPUTDEVICE[] rid = new RAWINPUTDEVICE[5];

             int i = 0;

             rid[i].usUsagePage = (ushort)SharpLib.Hid.UsagePage.WindowsMediaCenterRemoteControl;

             rid[i].usUsage = (ushort)SharpLib.Hid.UsageCollection.WindowsMediaCenter.WindowsMediaCenterRemoteControl;

             rid[i].dwFlags = Const.RIDEV_INPUTSINK;

             rid[i].hwndTarget = Handle;

             i++;

             rid[i].usUsagePage = (ushort)SharpLib.Hid.UsagePage.Consumer;

             rid[i].usUsage = (ushort)SharpLib.Hid.UsageCollection.Consumer.ConsumerControl;

             rid[i].dwFlags = Const.RIDEV_INPUTSINK;

             rid[i].hwndTarget = Handle;

             i++;

             rid[i].usUsagePage = (ushort)SharpLib.Hid.UsagePage.Consumer;

             rid[i].usUsage = (ushort)SharpLib.Hid.UsageCollection.Consumer.Selection;

             rid[i].dwFlags = Const.RIDEV_INPUTSINK;

             rid[i].hwndTarget = Handle;

             i++;

             rid[i].usUsagePage = (ushort)SharpLib.Hid.UsagePage.GenericDesktopControls;

             rid[i].usUsage = (ushort)SharpLib.Hid.UsageCollection.GenericDesktop.SystemControl;

             rid[i].dwFlags = Const.RIDEV_INPUTSINK;

             rid[i].hwndTarget = Handle;

             i++;

             rid[i].usUsagePage = (ushort)SharpLib.Hid.UsagePage.GenericDesktopControls;

             rid[i].usUsage = (ushort)SharpLib.Hid.UsageCollection.GenericDesktop.GamePad;

             rid[i].dwFlags = Const.RIDEV_INPUTSINK;

             rid[i].hwndTarget = Handle;

             //i++;

             //rid[i].usUsagePage = (ushort)SharpLib.Hid.UsagePage.GenericDesktopControls;

             //rid[i].usUsage = (ushort)SharpLib.Hid.UsageCollection.GenericDesktop.Keyboard;

             //rid[i].dwFlags = Const.RIDEV_EXINPUTSINK;

             //rid[i].hwndTarget = Handle;

             //i++;

             //rid[i].usUsagePage = (ushort)Hid.UsagePage.GenericDesktopControls;

             //rid[i].usUsage = (ushort)Hid.UsageCollection.GenericDesktop.Mouse;

             //rid[i].dwFlags = Const.RIDEV_EXINPUTSINK;

             //rid[i].hwndTarget = aHWND;

             iHidHandler = new SharpLib.Hid.Handler(rid);

             if (!iHidHandler.IsRegistered)

             {

                 Debug.WriteLine("Failed to register raw input devices: " + Marshal.GetLastWin32Error().ToString());

             }

             iHidHandler.OnHidEvent += HandleHidEventThreadSafe;

         }

         /// <summary>

         /// Here we receive HID events from our HID library.

         /// </summary>

         /// <param name="aSender"></param>

         /// <param name="aHidEvent"></param>

         public void HandleHidEventThreadSafe(object aSender, SharpLib.Hid.Event aHidEvent)

         {

             if (aHidEvent.IsStray)

             {

                 //Stray event just ignore it

                 return;

             }

             if (this.InvokeRequired)

             {

                 //Not in the proper thread, invoke ourselves

                 OnHidEventDelegate d = new OnHidEventDelegate(HandleHidEventThreadSafe);

                 this.Invoke(d, new object[] { aSender, aHidEvent });

             }

             else

             {

                 //We are in the proper thread

                 if (aHidEvent.Usages.Count > 0

                     && aHidEvent.UsagePage == (ushort)Hid.UsagePage.WindowsMediaCenterRemoteControl

                     && aHidEvent.Usages[0] == (ushort)Hid.Usage.WindowsMediaCenterRemoteControl.GreenStart)

                 //&& aHidEvent.UsagePage == (ushort)Hid.UsagePage.Consumer

                 //&& aHidEvent.Usages[0] == (ushort)Hid.Usage.ConsumerControl.ThinkPadFullscreenMagnifier)

                 {

                     //First check if the process we want to launch already exists

                     string procName = Path.GetFileNameWithoutExtension(Properties.Settings.Default.StartFileName);

                     Process[] existingProcesses = Process.GetProcessesByName(procName);

                     if (existingProcesses == null || existingProcesses.Length == 0)

                     {

                         // Process do not exists just try to launch it

                         ProcessStartInfo start = new ProcessStartInfo();

                         // Enter in the command line arguments, everything you would enter after the executable name itself

                         //start.Arguments = arguments; 

                         // Enter the executable to run, including the complete path

                         start.FileName = Properties.Settings.Default.StartFileName;

                         start.WindowStyle = ProcessWindowStyle.Normal;

                         start.CreateNoWindow = true;

                         start.UseShellExecute = true;

                         // Run the external process & wait for it to finish

                         Process proc = Process.Start(start);

                         //SL: We could have used that too

                         //Shell32.Shell shell = new Shell32.Shell();

                         //shell.ShellExecute(Properties.Settings.Default.StartFileName);

                     }

                     else

                     {

                         //This won't work properly until we have a manifest that enables uiAccess.

                         //However uiAccess just won't work with ClickOnce so we will have to use a different deployment system.

                         SwitchToThisWindow(existingProcesses[0].MainWindowHandle, true);

                     }

                 }

             }

         }

         /// <summary>

         /// We need to handle WM_INPUT.

         /// </summary>

         /// <param name="message"></param>

         protected override void WndProc(ref Message message)

         {

             switch (message.Msg)

             {

                 case Const.WM_INPUT:

                     //Returning zero means we processed that message.

                     message.Result = new IntPtr(0);

                     iHidHandler.ProcessInput(ref message);

                     break;

             }

             //Is that needed? Check the docs.

             base.WndProc(ref message);

         }

     }

 }