C#鍵盤鼠標(biāo)鉤子實(shí)例

更新時(shí)間：2014年12月12日 09:52:05 投稿：shichen2014

這篇文章主要介紹了C#鍵盤鼠標(biāo)鉤子的實(shí)現(xiàn)方法,以實(shí)例形式分析了針對(duì)鍵盤與鼠標(biāo)鉤子的實(shí)現(xiàn)步驟與相關(guān)技巧,并配有相關(guān)官方文檔說明的地址,需要的朋友可以參考下

本文實(shí)例講述了C#鍵盤鼠標(biāo)鉤子的實(shí)現(xiàn)方法。分享給大家供大家參考。具體實(shí)現(xiàn)方法如下：

復(fù)制代碼代碼如下:

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>
 /// 用戶鍵盤鼠標(biāo)鉤子
 /// </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 = 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">true if mouse events must be monitored</param>
 /// <param name="InstallKeyboardHook">true 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 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">true if mouse events must be monitored</param>
 /// <param name="InstallKeyboardHook">true 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 == 0 && InstallMouseHook)
 {
 // Create an instance of HookProc.
 MouseHookProcedure = new HookProc(MouseHookProc);
 //install hook
 hMouseHook = SetWindowsHookEx(
 WH_MOUSE_LL,
 MouseHookProcedure,
 Marshal.GetHINSTANCE(
 Assembly.GetExecutingAssembly().GetModules()[0]),
 0);
 //If SetWindowsHookEx fails.
 if (hMouseHook == 0)
 {
 //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 == 0 && InstallKeyboardHook)
            {
                // Create an instance of HookProc.
                KeyboardHookProcedure = new HookProc(KeyboardHookProc);
                //install hook
                hKeyboardHook = SetWindowsHookEx(
                    WH_KEYBOARD_LL,
                    KeyboardHookProcedure,
                    Marshal.GetHINSTANCE(
                    Assembly.GetExecutingAssembly().GetModules()[0]),
                    0);
                //If SetWindowsHookEx fails.
                if (hKeyboardHook == 0)
                {
                    //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">true if mouse hook must be uninstalled</param>
 /// <param name="UninstallKeyboardHook">true if keyboard hook must be uninstalled</param>
 /// <param name="ThrowExceptions">true 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 != 0 && UninstallMouseHook)
 {
 //uninstall hook
 int retMouse = UnhookWindowsHookEx(hMouseHook);
 //reset invalid handle
 hMouseHook = 0;
 //if failed and exception must be thrown
 if (retMouse == 0 && 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 != 0 && UninstallKeyboardHook)
            {
                //uninstall hook
                int retKeyboard = UnhookWindowsHookEx(hKeyboardHook);
                //reset invalid handle
                hKeyboardHook = 0;
                //if failed and exception must be thrown
                if (retKeyboard == 0 && 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 >= 0) && (OnMouseActivity != null))
 {
 //Marshall the data from callback.
 MouseLLHookStruct mouseHookStruct = (MouseLLHookStruct)Marshal.PtrToStructure(lParam, typeof(MouseLLHookStruct));

                //detect button clicked
                MouseButtons button = MouseButtons.None;
                short mouseDelta = 0;
                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 >> 16) & 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 = 0;
                if (button != MouseButtons.None)
                    if (wParam == WM_LBUTTONDBLCLK || wParam == WM_RBUTTONDBLCLK) clickCount = 2;
                    else clickCount = 1;

                //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 >= 0) && (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) != 0 ? true : false);

                    byte[] keyState = new byte[256];
                    GetKeyboardState(keyState);
                    byte[] inBuffer = new byte[2];
                    if (ToAscii(MyKeyboardHookStruct.vkCode,
                          MyKeyboardHookStruct.scanCode,
                          keyState,
                          inBuffer,
                          MyKeyboardHookStruct.flags) == 1)
                    {
                        char key = (char)inBuffer[0];
                        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 1;
            else
                return CallNextHookEx(hKeyboardHook, nCode, wParam, lParam);
        }
    }
}

希望本文所述對(duì)大家的C#程序設(shè)計(jì)有所幫助。

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