useractivityhook.cs

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        /// only the toggle bit of the CAPS LOCK key is relevant. The toggle state 
        /// of the NUM LOCK and SCROLL LOCK keys is ignored.
        /// </param>
        /// <param name="lpwTransKey">
        /// [out] Pointer to the buffer that receives the translated character or characters. 
        /// </param>
        /// <param name="fuState">
        /// [in] Specifies whether a menu is active. This parameter must be 1 if a menu is active, or 0 otherwise. 
        /// </param>
        /// <returns>
        /// If the specified key is a dead key, the return value is negative. Otherwise, it is one of the following values. 
        /// Value Meaning 
        /// 0 The specified virtual key has no translation for the current state of the keyboard. 
        /// 1 One character was copied to the buffer. 
        /// 2 Two characters were copied to the buffer. This usually happens when a dead-key character 
        /// (accent or diacritic) stored in the keyboard layout cannot be composed with the specified 
        /// virtual key to form a single character. 
        /// </returns>
        /// <remarks>
        /// http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winui/winui/windowsuserinterface/userinput/keyboardinput/keyboardinputreference/keyboardinputfunctions/toascii.asp
        /// </remarks>
        [DllImport("user32")]
        private static extern int ToAscii(
            int uVirtKey,
            int uScanCode,
            byte[] lpbKeyState,
            byte[] lpwTransKey,
            int fuState);

        /// <summary>
        /// The GetKeyboardState function copies the status of the 256 virtual keys to the 
        /// specified buffer. 
        /// </summary>
        /// <param name="pbKeyState">
        /// [in] Pointer to a 256-byte array that contains keyboard key states. 
        /// </param>
        /// <returns>
        /// If the function succeeds, the return value is nonzero.
        /// If the function fails, the return value is zero. To get extended error information, call GetLastError. 
        /// </returns>
        /// <remarks>
        /// http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winui/winui/windowsuserinterface/userinput/keyboardinput/keyboardinputreference/keyboardinputfunctions/toascii.asp
        /// </remarks>
        [DllImport("user32")]
        private static extern int GetKeyboardState(byte[] pbKeyState);

        [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
        private static extern short GetKeyState(int vKey);





        public enum MouseAction
        {
            MOUSEEVENTF_ABSOLUTE = 32768,   // Convert.ToInt32("8000", 16),
            MOUSEEVENTF_LEFTDOWN =2,    // Convert.ToInt32("2", 16),
            MOUSEEVENTF_LEFTUP = 4,     //Convert.ToInt32("4", 16),
            MOUSEEVENTF_MIDDLEDOWN = 32,    // Convert.ToInt32("20", 16),
            MOUSEEVENTF_MIDDLEUP = 64,       // Convert.ToInt32("40", 16),
            MOUSEEVENTF_MOVE = 1,       //Convert.ToInt32("1", 16),
            MOUSEEVENTF_RIGHTDOWN = 8,      // Convert.ToInt32("8", 16),
            MOUSEEVENTF_VIRTUALDESK =16384,     // Convert.ToInt32("4000", 16),
            MOUSEEVENTF_RIGHTUP = 16,       //Convert.ToInt32("10", 16),
            MOUSEEVENTF_WHEEL =2048,        // Convert.ToInt32("800", 16),
            MOUSEEVENTF_XDOWN =128,     // Convert.ToInt32("80", 16),
            MOUSEEVENTF_XUP =256        // Convert.ToInt32("100", 16)
        }
        [DllImport("User32")]
        public extern static void mouse_event(int dwFlags, int dx, int dy, int dwData, IntPtr dwExtraInfo);
        public void mouse_event(MouseAction maValue)
        {
            mouse_event((int)maValue, 0, 0, 0, 0);
        }

        [DllImport("User32")]
        public extern static void SetCursorPos(int x, int y);

        //[DllImport("User32")]
        //public extern static bool GetCursorPos(out POINT p);

        [DllImport("User32")]
        public extern static int ShowCursor(bool bShow);

        //Cursor.Position = new Point(X,Y);

        [DllImport("user32",   EntryPoint="mouse_event")]  
        public   static   extern   void   mouse_event   (  
                  int   dwFlags,  
                  int   dx,  
                  int   dy,  
                  int   cButtons,  
                  int   dwExtraInfo  
        );   

        


        #endregion

        #region Windows constants

        //values from Winuser.h in Microsoft SDK.
        /// <summary>
        /// Windows NT/2000/XP: Installs a hook procedure that monitors low-level mouse input events.
        /// </summary>
        private const int WH_MOUSE_LL       = 14;
        /// <summary>
        /// Windows NT/2000/XP: Installs a hook procedure that monitors low-level keyboard  input events.
        /// </summary>
        private const int WH_KEYBOARD_LL    = 13;

        /// <summary>
        /// Installs a hook procedure that monitors mouse messages. For more information, see the MouseProc hook procedure. 
        /// </summary>
        private const int WH_MOUSE          = 7;
        /// <summary>
        /// Installs a hook procedure that monitors keystroke messages. For more information, see the KeyboardProc hook procedure. 
        /// </summary>
        private const int WH_KEYBOARD       = 2;

        /// <summary>
        /// The WM_MOUSEMOVE message is posted to a window when the cursor moves. 
        /// </summary>
        private const int WM_MOUSEMOVE      = 0x200;
        /// <summary>
        /// The WM_LBUTTONDOWN message is posted when the user presses the left mouse button 
        /// </summary>
        private const int WM_LBUTTONDOWN    = 0x201;
        /// <summary>
        /// The WM_RBUTTONDOWN message is posted when the user presses the right mouse button
        /// </summary>
        private const int WM_RBUTTONDOWN    = 0x204;
        /// <summary>
        /// The WM_MBUTTONDOWN message is posted when the user presses the middle mouse button 
        /// </summary>
        private const int WM_MBUTTONDOWN    = 0x207;
        /// <summary>
        /// The WM_LBUTTONUP message is posted when the user releases the left mouse button 
        /// </summary>
        private const int WM_LBUTTONUP      = 0x202;
        /// <summary>
        /// The WM_RBUTTONUP message is posted when the user releases the right mouse button 
        /// </summary>
        private const int WM_RBUTTONUP      = 0x205;
        /// <summary>
        /// The WM_MBUTTONUP message is posted when the user releases the middle mouse button 
        /// </summary>
        private const int WM_MBUTTONUP      = 0x208;
        /// <summary>
        /// The WM_LBUTTONDBLCLK message is posted when the user double-clicks the left mouse button 
        /// </summary>
        private const int WM_LBUTTONDBLCLK  = 0x203;
        /// <summary>
        /// The WM_RBUTTONDBLCLK message is posted when the user double-clicks the right mouse button 
        /// </summary>
        private const int WM_RBUTTONDBLCLK  = 0x206;
        /// <summary>
        /// The WM_RBUTTONDOWN message is posted when the user presses the right mouse button 
        /// </summary>
        private const int WM_MBUTTONDBLCLK  = 0x209;
        /// <summary>
        /// The WM_MOUSEWHEEL message is posted when the user presses the mouse wheel. 
        /// </summary>
        private const int WM_MOUSEWHEEL     = 0x020A;

        /// <summary>
        /// The WM_KEYDOWN message is posted to the window with the keyboard focus when a nonsystem 
        /// key is pressed. A nonsystem key is a key that is pressed when the ALT key is not pressed.
        /// </summary>
        private const int WM_KEYDOWN = 0x100;
        /// <summary>
        /// The WM_KEYUP message is posted to the window with the keyboard focus when a nonsystem 
        /// key is released. A nonsystem key is a key that is pressed when the ALT key is not pressed, 
        /// or a keyboard key that is pressed when a window has the keyboard focus.
        /// </summary>
        private const int WM_KEYUP = 0x101;
        /// <summary>
        /// The WM_SYSKEYDOWN message is posted to the window with the keyboard focus when the user 
        /// presses the F10 key (which activates the menu bar) or holds down the ALT key and then 
        /// presses another key. It also occurs when no window currently has the keyboard focus; 
        /// in this case, the WM_SYSKEYDOWN message is sent to the active window. The window that 
        /// receives the message can distinguish between these two contexts by checking the context 
        /// code in the lParam parameter. 
        /// </summary>
        private const int WM_SYSKEYDOWN = 0x104;
        /// <summary>
        /// The WM_SYSKEYUP message is posted to the window with the keyboard focus when the user 
        /// releases a key that was pressed while the ALT key was held down. It also occurs when no 
        /// window currently has the keyboard focus; in this case, the WM_SYSKEYUP message is sent 
        /// to the active window. The window that receives the message can distinguish between 
        /// these two contexts by checking the context code in the lParam parameter. 
        /// </summary>
        private const int WM_SYSKEYUP = 0x105;

        private const byte VK_SHIFT     = 0x10;
        private const byte VK_CAPITAL   = 0x14;
        private const byte VK_NUMLOCK   = 0x90;

        #endregion

        /// <summary>
        /// Creates an instance of UserActivityHook object and sets mouse and keyboard hooks.
        /// </summary>
        /// <exception cref="Win32Exception">Any windows problem.</exception>
        public UserActivityHook()
        {
            //Start();
        }

        /// <summary>
        /// Creates an instance of UserActivityHook object and installs both or one of mouse and/or keyboard hooks and starts rasing events
        /// </summary>
        /// <param name="InstallMouseHook"><b>true</b> if mouse events must be monitored</param>
        /// <param name="InstallKeyboardHook"><b>true</b> if keyboard events must be monitored</param>
        /// <exception cref="Win32Exception">Any windows problem.</exception>
        /// <remarks>
        /// To create an instance without installing hooks call new UserActivityHook(false, false)
        /// </remarks>
        //public UserActivityHook(bool InstallMouseHook, bool InstallKeyboardHook)
        //{
        //    Start(InstallMouseHook, InstallKeyboardHook);
        //}

        /// <summary>
        /// Destruction.
        /// </summary>
        ~UserActivityHook()
        {
            //uninstall hooks and do not throw exceptions
            Stop(true, true, false);
        }

        /// <summary>
        /// Occurs when the user moves the mouse, presses any mouse button or scrolls the wheel
        /// </summary>
        public event MouseEventHandler OnMouseActivity;
        /// <summary>
        /// Occurs when the user presses a key
        /// </summary>
        public event KeyEventHandler KeyDown;
        /// <summary>
        /// Occurs when the user presses and releases 
        /// </summary>
        public event KeyPressEventHandler KeyPress;
        /// <summary>
        /// Occurs when the user releases a key
        /// </summary>
        public event KeyEventHandler KeyUp;


        /// <summary>
        /// Stores the handle to the mouse hook procedure.
        /// </summary>
        private int hMouseHook = 0;
        /// <summary>
        /// Stores the handle to the keyboard hook procedure.
        /// </summary>
        private int hKeyboardHook = 0;


        /// <summary>
        /// Declare MouseHookProcedure as HookProc type.
        /// </summary>
        private static HookProc MouseHookProcedure;
        /// <summary>
        /// Declare KeyboardHookProcedure as HookProc type.
        /// </summary>
        private static HookProc KeyboardHookProcedure;


        /// <summary>
        /// Installs both mouse and keyboard hooks and starts rasing events
        /// </summary>
        /// <exception cref="Win32Exception">Any windows problem.</exception>
        public void Start()
        {
            this.Start(true, true);