c#键盘鼠标钩子

 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.Windows.Forms;
 using System.Runtime.InteropServices;
 using System.ComponentModel;
 using System.Reflection;

 namespace Alif.CommonAPI.WindowsAPI
 {
     /// <summary>
     /// 用户键盘鼠标钩子
     /// </summary>
     public class UserActivityHook
     {
         #region Windows structure definitions

         /// <summary>
         /// The POINT structure defines the x- and y- coordinates of a point.
         /// </summary>
         /// <remarks>
         /// http://msdn.microsoft.com/library/default.asp?url=/library/en-us/gdi/rectangl_0tiq.asp
         /// </remarks>
         [StructLayout(LayoutKind.Sequential)]
         private class POINT
         {
             /// <summary>
             /// Specifies the x-coordinate of the point.
             /// </summary>
             public int x;
             /// <summary>
             /// Specifies the y-coordinate of the point.
             /// </summary>
             public int y;
         }

         /// <summary>
         /// The MOUSEHOOKSTRUCT structure contains information about a mouse event passed to a WH_MOUSE hook procedure, MouseProc.
         /// </summary>
         /// <remarks>
         /// http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winui/winui/windowsuserinterface/windowing/hooks/hookreference/hookstructures/cwpstruct.asp
         /// </remarks>
         [StructLayout(LayoutKind.Sequential)]
         private class MouseHookStruct
         {
             /// <summary>
             /// Specifies a POINT structure that contains the x- and y-coordinates of the cursor, in screen coordinates.
             /// </summary>
             public POINT pt;
             /// <summary>
             /// Handle to the window that will receive the mouse message corresponding to the mouse event.
             /// </summary>
             public int hwnd;
             /// <summary>
             /// Specifies the hit-test value. For a list of hit-test values, see the description of the WM_NCHITTEST message.
             /// </summary>
             public int wHitTestCode;
             /// <summary>
             /// Specifies extra information associated with the message.
             /// </summary>
             public int dwExtraInfo;
         }

         /// <summary>
         /// The MSLLHOOKSTRUCT structure contains information about a low-level keyboard input event.
         /// </summary>
         [StructLayout(LayoutKind.Sequential)]
         private class MouseLLHookStruct
         {
             /// <summary>
             /// Specifies a POINT structure that contains the x- and y-coordinates of the cursor, in screen coordinates.
             /// </summary>
             public POINT pt;
             /// <summary>
             /// If the message is WM_MOUSEWHEEL, the high-order word of this member is the wheel delta.
             /// The low-order word is reserved. A positive value indicates that the wheel was rotated forward,
             /// away from the user; a negative value indicates that the wheel was rotated backward, toward the user.
             /// One wheel click is defined as WHEEL_DELTA, which is 120.
             ///If the message is WM_XBUTTONDOWN, WM_XBUTTONUP, WM_XBUTTONDBLCLK, WM_NCXBUTTONDOWN, WM_NCXBUTTONUP,
             /// or WM_NCXBUTTONDBLCLK, the high-order word specifies which X button was pressed or released,
             /// and the low-order word is reserved. This value can be one or more of the following values. Otherwise, mouseData is not used.
             ///XBUTTON1
             ///The first X button was pressed or released.
             ///XBUTTON2
             ///The second X button was pressed or released.
             /// </summary>
             public int mouseData;
             /// <summary>
             /// Specifies the event-injected flag. An application can use the following value to test the mouse flags. Value Purpose
             ///LLMHF_INJECTED Test the event-injected flag.
             ///0
             ///Specifies whether the event was injected. The value is 1 if the event was injected; otherwise, it is 0.
             ///1-15
             ///Reserved.
             /// </summary>
             public int flags;
             /// <summary>
             /// Specifies the time stamp for this message.
             /// </summary>
             public int time;
             /// <summary>
             /// Specifies extra information associated with the message.
             /// </summary>
             public int dwExtraInfo;
         }

         /// <summary>
         /// The KBDLLHOOKSTRUCT structure contains information about a low-level keyboard input event.
         /// </summary>
         /// <remarks>
         /// http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winui/winui/windowsuserinterface/windowing/hooks/hookreference/hookstructures/cwpstruct.asp
         /// </remarks>
         [StructLayout(LayoutKind.Sequential)]
         private class KeyboardHookStruct
         {
             /// <summary>
             /// Specifies a virtual-key code. The code must be a value in the range 1 to 254.
             /// </summary>
             public int vkCode;
             /// <summary>
             /// Specifies a hardware scan code for the key.
             /// </summary>
             public int scanCode;
             /// <summary>
             /// Specifies the extended-key flag, event-injected flag, context code, and transition-state flag.
             /// </summary>
             public int flags;
             /// <summary>
             /// Specifies the time stamp for this message.
             /// </summary>
             public int time;
             /// <summary>
             /// Specifies extra information associated with the message.
             /// </summary>
             public int dwExtraInfo;
         }
         #endregion

         #region Windows function imports
         /// <summary>
         /// The SetWindowsHookEx function installs an application-defined hook procedure into a hook chain.
         /// You would install a hook procedure to monitor the system for certain types of events. These events
         /// are associated either with a specific thread or with all threads in the same desktop as the calling thread.
         /// </summary>
         /// <param name="idHook">
         /// [in] Specifies the type of hook procedure to be installed. This parameter can be one of the following values.
         /// </param>
         /// <param name="lpfn">
         /// [in] Pointer to the hook procedure. If the dwThreadId parameter is zero or specifies the identifier of a
         /// thread created by a different process, the lpfn parameter must point to a hook procedure in a dynamic-link
         /// library (DLL). Otherwise, lpfn can point to a hook procedure in the code associated with the current process.
         /// </param>
         /// <param name="hMod">
         /// [in] Handle to the DLL containing the hook procedure pointed to by the lpfn parameter.
         /// The hMod parameter must be set to NULL if the dwThreadId parameter specifies a thread created by
         /// the current process and if the hook procedure is within the code associated with the current process.
         /// </param>
         /// <param name="dwThreadId">
         /// [in] Specifies the identifier of the thread with which the hook procedure is to be associated.
         /// If this parameter is zero, the hook procedure is associated with all existing threads running in the
         /// same desktop as the calling thread.
         /// </param>
         /// <returns>
         /// If the function succeeds, the return value is the handle to the hook procedure.
         /// If the function fails, the return value is NULL. To get extended error information, call GetLastError.
         /// </returns>
         /// <remarks>
         /// http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winui/winui/windowsuserinterface/windowing/hooks/hookreference/hookfunctions/setwindowshookex.asp
         /// </remarks>
         [DllImport("user32.dll", CharSet = CharSet.Auto,
            CallingConvention = CallingConvention.StdCall, SetLastError = true)]
         private static extern int SetWindowsHookEx(
             int idHook,
             HookProc lpfn,
             IntPtr hMod,
             int dwThreadId);

         /// <summary>
         /// The UnhookWindowsHookEx function removes a hook procedure installed in a hook chain by the SetWindowsHookEx function.
         /// </summary>
         /// <param name="idHook">
         /// [in] Handle to the hook to be removed. This parameter is a hook handle obtained by a previous call to SetWindowsHookEx.
         /// </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/windowing/hooks/hookreference/hookfunctions/setwindowshookex.asp
         /// </remarks>
         [DllImport("user32.dll", CharSet = CharSet.Auto,
             CallingConvention = CallingConvention.StdCall, SetLastError = true)]
         private static extern int UnhookWindowsHookEx(int idHook);

         /// <summary>
         /// The CallNextHookEx function passes the hook information to the next hook procedure in the current hook chain.
         /// A hook procedure can call this function either before or after processing the hook information.
         /// </summary>
         /// <param name="idHook">Ignored.</param>
         /// <param name="nCode">
         /// [in] Specifies the hook code passed to the current hook procedure.
         /// The next hook procedure uses this code to determine how to process the hook information.
         /// </param>
         /// <param name="wParam">
         /// [in] Specifies the wParam value passed to the current hook procedure.
         /// The meaning of this parameter depends on the type of hook associated with the current hook chain.
         /// </param>
         /// <param name="lParam">
         /// [in] Specifies the lParam value passed to the current hook procedure.
         /// The meaning of this parameter depends on the type of hook associated with the current hook chain.
         /// </param>
         /// <returns>
         /// This value is returned by the next hook procedure in the chain.
         /// The current hook procedure must also return this value. The meaning of the return value depends on the hook type.
         /// For more information, see the descriptions of the individual hook procedures.
         /// </returns>
         /// <remarks>
         /// http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winui/winui/windowsuserinterface/windowing/hooks/hookreference/hookfunctions/setwindowshookex.asp
         /// </remarks>
         [DllImport("user32.dll", CharSet = CharSet.Auto,
              CallingConvention = CallingConvention.StdCall)]
         private static extern int CallNextHookEx(
             int idHook,
             int nCode,
             int wParam,
             IntPtr lParam);

         /// <summary>
         /// The CallWndProc hook procedure is an application-defined or library-defined callback
         /// function used with the SetWindowsHookEx function. The HOOKPROC type defines a pointer
         /// to this callback function. CallWndProc is a placeholder for the application-defined
         /// or library-defined function name.
         /// </summary>
         /// <param name="nCode">
         /// [in] Specifies whether the hook procedure must process the message.
         /// If nCode is HC_ACTION, the hook procedure must process the message.
         /// If nCode is less than zero, the hook procedure must pass the message to the
         /// CallNextHookEx function without further processing and must return the
         /// value returned by CallNextHookEx.
         /// </param>
         /// <param name="wParam">
         /// [in] Specifies whether the message was sent by the current thread.
         /// If the message was sent by the current thread, it is nonzero; otherwise, it is zero.
         /// </param>
         /// <param name="lParam">
         /// [in] Pointer to a CWPSTRUCT structure that contains details about the message.
         /// </param>
         /// <returns>
         /// If nCode is less than zero, the hook procedure must return the value returned by CallNextHookEx.
         /// If nCode is greater than or equal to zero, it is highly recommended that you call CallNextHookEx
         /// and return the value it returns; otherwise, other applications that have installed WH_CALLWNDPROC
         /// hooks will not receive hook notifications and may behave incorrectly as a result. If the hook
         /// procedure does not call CallNextHookEx, the return value should be zero.
         /// </returns>
         /// <remarks>
         /// http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winui/winui/windowsuserinterface/windowing/hooks/hookreference/hookfunctions/callwndproc.asp
         /// </remarks>
         private delegate int HookProc(int nCode, int wParam, IntPtr lParam);

         /// <summary>
         /// The ToAscii function translates the specified virtual-key code and keyboard
         /// state to the corresponding character or characters. The function translates the code
         /// using the input language and physical keyboard layout identified by the keyboard layout handle.
         /// </summary>
         /// <param name="uVirtKey">
         /// [in] Specifies the virtual-key code to be translated.
         /// </param>
         /// <param name="uScanCode">
         /// [in] Specifies the hardware scan code of the key to be translated.
         /// The high-order bit of this value is set if the key is up (not pressed).
         /// </param>
         /// <param name="lpbKeyState">
         /// [in] Pointer to a 256-byte array that contains the current keyboard state.
         /// Each element (byte) in the array contains the state of one key.
         /// If the high-order bit of a byte is set, the key is down (pressed).
         /// The low bit, if set, indicates that the key is toggled on. In this function,
         /// 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);

         #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 = ;
         /// <summary>
         /// Windows NT/2000/XP: Installs a hook procedure that monitors low-level keyboard  input events.
         /// </summary>
         private const int WH_KEYBOARD_LL = ;

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

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

         /// <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 raising events
         /// </summary>
         /// <exception cref="Win32Exception">Any windows problem.</exception>
         public void Start()
         {
             this.Start(true, true);
         }

         /// <summary>
         /// Installs both or one of mouse and/or keyboard hooks and starts raising 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>
         public void Start(bool InstallMouseHook, bool InstallKeyboardHook)
         {
             // install Mouse hook only if it is not installed and must be installed
             if (hMouseHook ==  && InstallMouseHook)
             {
                 // Create an instance of HookProc.
                 MouseHookProcedure = new HookProc(MouseHookProc);
                 //install hook
                 hMouseHook = SetWindowsHookEx(
                     WH_MOUSE_LL,
                     MouseHookProcedure,
                     Marshal.GetHINSTANCE(
                     Assembly.GetExecutingAssembly().GetModules()[]),
                     );
                 //If SetWindowsHookEx fails.
                 if (hMouseHook == )
                 {
                     //Returns the error code returned by the last unmanaged function called using platform invoke that has the DllImportAttribute.SetLastError flag set.
                     int errorCode = Marshal.GetLastWin32Error();
                     //do cleanup
                     Stop(true, false, false);
                     //Initializes and throws a new instance of the Win32Exception class with the specified error.
                     throw new Win32Exception(errorCode);
                 }
             }

             // install Keyboard hook only if it is not installed and must be installed
             if (hKeyboardHook ==  && InstallKeyboardHook)
             {
                 // Create an instance of HookProc.
                 KeyboardHookProcedure = new HookProc(KeyboardHookProc);
                 //install hook
                 hKeyboardHook = SetWindowsHookEx(
                     WH_KEYBOARD_LL,
                     KeyboardHookProcedure,
                     Marshal.GetHINSTANCE(
                     Assembly.GetExecutingAssembly().GetModules()[]),
                     );
                 //If SetWindowsHookEx fails.
                 if (hKeyboardHook == )
                 {
                     //Returns the error code returned by the last unmanaged function called using platform invoke that has the DllImportAttribute.SetLastError flag set.
                     int errorCode = Marshal.GetLastWin32Error();
                     //do cleanup
                     Stop(false, true, false);
                     //Initializes and throws a new instance of the Win32Exception class with the specified error.
                     throw new Win32Exception(errorCode);
                 }
             }
         }

         /// <summary>
         /// Stops monitoring both mouse and keyboard events and rasing events.
         /// </summary>
         /// <exception cref="Win32Exception">Any windows problem.</exception>
         public void Stop()
         {
             this.Stop(true, true, true);
         }

         /// <summary>
         /// Stops monitoring both or one of mouse and/or keyboard events and rasing events.
         /// </summary>
         /// <param name="UninstallMouseHook"><b>true</b> if mouse hook must be uninstalled</param>
         /// <param name="UninstallKeyboardHook"><b>true</b> if keyboard hook must be uninstalled</param>
         /// <param name="ThrowExceptions"><b>true</b> if exceptions which occured during uninstalling must be thrown</param>
         /// <exception cref="Win32Exception">Any windows problem.</exception>
         public void Stop(bool UninstallMouseHook, bool UninstallKeyboardHook, bool ThrowExceptions)
         {
             //if mouse hook set and must be uninstalled
             if (hMouseHook !=  && UninstallMouseHook)
             {
                 //uninstall hook
                 int retMouse = UnhookWindowsHookEx(hMouseHook);
                 //reset invalid handle
                 hMouseHook = ;
                 //if failed and exception must be thrown
                 if (retMouse ==  && ThrowExceptions)
                 {
                     //Returns the error code returned by the last unmanaged function called using platform invoke that has the DllImportAttribute.SetLastError flag set.
                     int errorCode = Marshal.GetLastWin32Error();
                     //Initializes and throws a new instance of the Win32Exception class with the specified error.
                     throw new Win32Exception(errorCode);
                 }
             }

             //if keyboard hook set and must be uninstalled
             if (hKeyboardHook !=  && UninstallKeyboardHook)
             {
                 //uninstall hook
                 int retKeyboard = UnhookWindowsHookEx(hKeyboardHook);
                 //reset invalid handle
                 hKeyboardHook = ;
                 //if failed and exception must be thrown
                 if (retKeyboard ==  && ThrowExceptions)
                 {
                     //Returns the error code returned by the last unmanaged function called using platform invoke that has the DllImportAttribute.SetLastError flag set.
                     int errorCode = Marshal.GetLastWin32Error();
                     //Initializes and throws a new instance of the Win32Exception class with the specified error.
                     throw new Win32Exception(errorCode);
                 }
             }
         }

         /// <summary>
         /// A callback function which will be called every time a mouse activity detected.
         /// </summary>
         /// <param name="nCode">
         /// [in] Specifies whether the hook procedure must process the message.
         /// If nCode is HC_ACTION, the hook procedure must process the message.
         /// If nCode is less than zero, the hook procedure must pass the message to the
         /// CallNextHookEx function without further processing and must return the
         /// value returned by CallNextHookEx.
         /// </param>
         /// <param name="wParam">
         /// [in] Specifies whether the message was sent by the current thread.
         /// If the message was sent by the current thread, it is nonzero; otherwise, it is zero.
         /// </param>
         /// <param name="lParam">
         /// [in] Pointer to a CWPSTRUCT structure that contains details about the message.
         /// </param>
         /// <returns>
         /// If nCode is less than zero, the hook procedure must return the value returned by CallNextHookEx.
         /// If nCode is greater than or equal to zero, it is highly recommended that you call CallNextHookEx
         /// and return the value it returns; otherwise, other applications that have installed WH_CALLWNDPROC
         /// hooks will not receive hook notifications and may behave incorrectly as a result. If the hook
         /// procedure does not call CallNextHookEx, the return value should be zero.
         /// </returns>
         private int MouseHookProc(int nCode, int wParam, IntPtr lParam)
         {
             // if ok and someone listens to our events
             if ((nCode >= ) && (OnMouseActivity != null))
             {
                 //Marshall the data from callback.
                 MouseLLHookStruct mouseHookStruct = (MouseLLHookStruct)Marshal.PtrToStructure(lParam, typeof(MouseLLHookStruct));

                 //detect button clicked
                 MouseButtons button = MouseButtons.None;
                 short mouseDelta = ;
                 switch (wParam)
                 {
                     case WM_LBUTTONDOWN:
                         //case WM_LBUTTONUP:
                         //case WM_LBUTTONDBLCLK:
                         button = MouseButtons.Left;
                         break;
                     case WM_RBUTTONDOWN:
                         //case WM_RBUTTONUP:
                         //case WM_RBUTTONDBLCLK:
                         button = MouseButtons.Right;
                         break;
                     case WM_MOUSEWHEEL:
                         //If the message is WM_MOUSEWHEEL, the high-order word of mouseData member is the wheel delta.
                         //One wheel click is defined as WHEEL_DELTA, which is 120.
                         //(value >> 16) & 0xffff; retrieves the high-order word from the given 32-bit value
                         mouseDelta = (short)((mouseHookStruct.mouseData >> ) & 0xffff);
                         //TODO: X BUTTONS (I havent them so was unable to test)
                         //If the message is WM_XBUTTONDOWN, WM_XBUTTONUP, WM_XBUTTONDBLCLK, WM_NCXBUTTONDOWN, WM_NCXBUTTONUP,
                         //or WM_NCXBUTTONDBLCLK, the high-order word specifies which X button was pressed or released,
                         //and the low-order word is reserved. This value can be one or more of the following values.
                         //Otherwise, mouseData is not used.
                         break;
                 }

                 //double clicks
                 int clickCount = ;
                 if (button != MouseButtons.None)
                     if (wParam == WM_LBUTTONDBLCLK || wParam == WM_RBUTTONDBLCLK) clickCount = ;
                     else clickCount = ;

                 //generate event
                 MouseEventArgs e = new MouseEventArgs(
                                    button,
                                    clickCount,
                                    mouseHookStruct.pt.x,
                                    mouseHookStruct.pt.y,
                                    mouseDelta);
                 //raise it
                 OnMouseActivity(this, e);
             }
             //call next hook
             return CallNextHookEx(hMouseHook, nCode, wParam, lParam);
         }

         /// <summary>
         /// A callback function which will be called every time a keyboard activity detected.
         /// </summary>
         /// <param name="nCode">
         /// [in] Specifies whether the hook procedure must process the message.
         /// If nCode is HC_ACTION, the hook procedure must process the message.
         /// If nCode is less than zero, the hook procedure must pass the message to the
         /// CallNextHookEx function without further processing and must return the
         /// value returned by CallNextHookEx.
         /// </param>
         /// <param name="wParam">
         /// [in] Specifies whether the message was sent by the current thread.
         /// If the message was sent by the current thread, it is nonzero; otherwise, it is zero.
         /// </param>
         /// <param name="lParam">
         /// [in] Pointer to a CWPSTRUCT structure that contains details about the message.
         /// </param>
         /// <returns>
         /// If nCode is less than zero, the hook procedure must return the value returned by CallNextHookEx.
         /// If nCode is greater than or equal to zero, it is highly recommended that you call CallNextHookEx
         /// and return the value it returns; otherwise, other applications that have installed WH_CALLWNDPROC
         /// hooks will not receive hook notifications and may behave incorrectly as a result. If the hook
         /// procedure does not call CallNextHookEx, the return value should be zero.
         /// </returns>
         private int KeyboardHookProc(int nCode, Int32 wParam, IntPtr lParam)
         {
             //indicates if any of underlaing events set e.Handled flag
             bool handled = false;
             //it was ok and someone listens to events
             if ((nCode >= ) && (KeyDown != null || KeyUp != null || KeyPress != null))
             {
                 //read structure KeyboardHookStruct at lParam
                 KeyboardHookStruct MyKeyboardHookStruct = (KeyboardHookStruct)Marshal.PtrToStructure(lParam, typeof(KeyboardHookStruct));
                 //raise KeyDown
                 if (KeyDown != null && (wParam == WM_KEYDOWN || wParam == WM_SYSKEYDOWN))
                 {
                     Keys keyData = (Keys)MyKeyboardHookStruct.vkCode;
                     KeyEventArgs e = new KeyEventArgs(keyData);
                     KeyDown(this, e);
                     handled = handled || e.Handled;
                 }

                 // raise KeyPress
                 if (KeyPress != null && wParam == WM_KEYDOWN)
                 {
                     bool isDownShift = ((GetKeyState(VK_SHIFT) & 0x80) == 0x80 ? true : false);
                     bool isDownCapslock = (GetKeyState(VK_CAPITAL) !=  ? true : false);

                     byte[] keyState = new byte[];
                     GetKeyboardState(keyState);
                     byte[] inBuffer = new byte[];
                     if (ToAscii(MyKeyboardHookStruct.vkCode,
                           MyKeyboardHookStruct.scanCode,
                           keyState,
                           inBuffer,
                           MyKeyboardHookStruct.flags) == )
                     {
                         char key = (char)inBuffer[];
                         if ((isDownCapslock ^ isDownShift) && Char.IsLetter(key)) key = Char.ToUpper(key);
                         KeyPressEventArgs e = new KeyPressEventArgs(key);
                         KeyPress(this, e);
                         handled = handled || e.Handled;
                     }
                 }

                 // raise KeyUp
                 if (KeyUp != null && (wParam == WM_KEYUP || wParam == WM_SYSKEYUP))
                 {
                     Keys keyData = (Keys)MyKeyboardHookStruct.vkCode;
                     KeyEventArgs e = new KeyEventArgs(keyData);
                     KeyUp(this, e);
                     handled = handled || e.Handled;
                 }

             }

             //if event handled in application do not handoff to other listeners
             if (handled)
                 return ;
             else
                 return CallNextHookEx(hKeyboardHook, nCode, wParam, lParam);
         }
     }
 }