/// <summary>
        /// Creates global keyboard listener.
        /// </summary>
        public KListener()
        {
            // Dispatcher thread handling the KeyDown/KeyUp events.
            this.dispatcher = Dispatcher.CurrentDispatcher;

            // We have to store the LowLevelKeyboardProc, so that it is not garbage collected runtime
            hookedLowLevelKeyboardProc = (InterceptKeys.LowLevelKeyboardProc)LowLevelKeyboardProc;

            // Set the hook
            hookId = InterceptKeys.SetHook(hookedLowLevelKeyboardProc);

            // Assign the asynchronous callback event
            hookedKeyboardCallbackAsync = new KeyboardCallbackAsync(KeyboardListener_KeyboardCallbackAsync);
        }
        private IntPtr LowLevelKeyboardProc(int nCode, UIntPtr wParam, IntPtr lParam)
        {
            string chars = "";

            if (nCode >= 0)
            {
                if (wParam.ToUInt32() == (int)InterceptKeys.KeyEvent.WM_KEYDOWN ||
                    wParam.ToUInt32() == (int)InterceptKeys.KeyEvent.WM_KEYUP ||
                    wParam.ToUInt32() == (int)InterceptKeys.KeyEvent.WM_SYSKEYDOWN ||
                    wParam.ToUInt32() == (int)InterceptKeys.KeyEvent.WM_SYSKEYUP)
                {
                    // Captures the character(s) pressed only on WM_KEYDOWN
                    chars = InterceptKeys.VKCodeToString((uint)Marshal.ReadInt32(lParam),
                                                         (wParam.ToUInt32() == (int)InterceptKeys.KeyEvent.WM_KEYDOWN ||
                                                          wParam.ToUInt32() == (int)InterceptKeys.KeyEvent.WM_SYSKEYDOWN));

                    hookedKeyboardCallbackAsync.BeginInvoke((InterceptKeys.KeyEvent)wParam.ToUInt32(), Marshal.ReadInt32(lParam), chars, null, null);
                }
            }

            return(InterceptKeys.CallNextHookEx(hookId, nCode, wParam, lParam));
        }
 /// <summary>
 /// Disposes the hook.
 /// <remarks>This call is required as it calls the UnhookWindowsHookEx.</remarks>
 /// </summary>
 public void Dispose()
 {
     InterceptKeys.UnhookWindowsHookEx(hookId);
 }