Question

求一个C＃的键盘鼠标钩子的例子．

要调试通过的代码．

Answer 1

1.钩子到底是什么意思呢？为啥按Ctrl+Alt+Z就把QQ主面板弹出来？这就是用到了键盘钩子，他能截获系统的键盘事件。
而键盘钩子就可以在用户按Ctrl+Alt+Z的时候截取到这个按键消息。
然后对这个消息进行处理，比如说QQ的处理就是把他的主面板弹出来。

2.C#键盘鼠标勾子的例程：

using System;
using System.Runtime.InteropServices;
using System.Reflection;
using System.Threading;
using System.Windows.Forms;
using System.Diagnostics;
using System.Collections.Generic;
namespace ConsoleApplicationTest
{
    /// <summary> 
    /// 这个类可以让你得到一个在运行中程序的所有鼠标和键盘事件 (系统钩子)
    /// 并且引发一个带KeyEventArgs和MouseEventArgs参数的.NET事件以便你很容易使用这些信息
    /// 鼠标钩子处理函数：MouseHookProc
    /// 键盘钩子处理函数：KeyboardHookProc
    /// 使用方法：
    ///   1.新建该类。
    ///   2.声明OnMouseActivity、OnKeyDownEvent、OnKeyUpEvent、OnKeyPressEvent.
    ///   3.使用时调用相应的事件即可。
    ///   4.要添加应用请在MouseHookProc()和KeyboardHookProc()中自己添加。
    /// 使用示例：
    /// public mkhook = new KeyBordHook();
    /// mkhook.OnKeyDownEvent += new KeyEventHandler(OnKeyDownEventHandler);
    /// mkhook.OnMouseActivity += new MouseEventHandler(OnMouseEventHandler);
    /// private void OnKeyDownEventHandler(object sender, KeyEventArgs e)
    /// {
    ///     Console.WriteLine("KeyDown......");
    /// }
    /// private void OnMouseEventHandler(object sender, MouseEventArgs e)
    /// {
    ///     Console.WriteLine("MouseEvent......");
    /// }
    /// </summary> 
    /// <remarks> 
    /// 修改:xyan nay6@163.com
    /// 修改时间:10.06.11 
    /// </remarks> 
    public class KeyBordHook : IDisposable
    {
        private const int WM_KEYDOWN = 0x100;
        private const int WM_KEYUP = 0x101;
        private const int WM_SYSKEYDOWN = 0x104;
        private const int WM_SYSKEYUP = 0x105;
        //全局的事件 
        public event MouseEventHandler OnMouseActivity;//鼠标事件
        public event KeyEventHandler OnKeyDownEvent;//键按下
        public event KeyEventHandler OnKeyUpEvent;//键放下
        public event KeyPressEventHandler OnKeyPressEvent;//键按下
        static int hMouseHook = 0;   //鼠标钩子句柄
        static int hKeyboardHook = 0; //键盘钩子句柄
        //鼠标常量 
        public const int WH_MOUSE = 7;
        public const int WH_MOUSE_LL = 14; //鼠标常量 
        public const int WH_KEYBOARD_LL = 13; //键盘常量 
        HookProc MouseHookProcedure;   //声明鼠标钩子事件类型.
        HookProc KeyboardHookProcedure; //声明键盘钩子事件类型.
        //Declare   wrapper   managed   POINT   class. 
        [StructLayout(LayoutKind.Sequential)]
        public class POINT
        {
            public int x;
            public int y;
        }
        //声明鼠标钩子的封送结构类型 
        [StructLayout(LayoutKind.Sequential)]
        public class MouseHookStruct
        {
            public POINT pt;
            public int hwnd;
            public int wHitTestCode;
            public int dwExtraInfo;
        }
        //声明键盘钩子的封送结构类型 
        [StructLayout(LayoutKind.Sequential)]
        public class KeyboardHookStruct
        {
            public int vkCode; //表示一个在1到254间的虚似键盘码 
            public int scanCode; //表示硬件扫描码 
            public int flags;
            public int time;
            public int dwExtraInfo;
        }
        //装置钩子的函数 
        [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
        public static extern int SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hInstance, int threadId);
        //卸下钩子的函数 
        [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
        public static extern bool UnhookWindowsHookEx(int idHook);
        //下一个钩挂的函数 
        [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
        public static extern int CallNextHookEx(int idHook, int nCode, Int32 wParam, IntPtr lParam);
        [DllImport("user32")]
        public static extern int ToAscii(int uVirtKey, int uScanCode, byte[] lpbKeyState, byte[] lpwTransKey, int fuState);
        [DllImport("user32")]
        public static extern int GetKeyboardState(byte[] pbKeyState);
        [DllImport("kernel32.dll", CharSet = CharSet.Auto,
            CallingConvention = CallingConvention.StdCall)]
        private static extern IntPtr GetModuleHandle(string lpModuleName);
        public delegate int HookProc(int nCode, Int32 wParam, IntPtr lParam);
        //先前按下的键
        public List<Keys> preKeys = new List<Keys>();
        /// <summary> 
        /// 墨认的构造函数构造当前类的实例并自动的运行起来. 
        /// </summary> 
        public KeyBordHook()
        {
            Start();
        }
        //析构函数. 
        ~KeyBordHook()
        {
            Stop();
        }
        public void Dispose()
        {
            Stop();
        }
        public void Start()
        {
            //安装键盘钩子 
            if (hKeyboardHook == 0)
            {
                KeyboardHookProcedure = new HookProc(KeyboardHookProc);
                //hKeyboardHook = SetWindowsHookEx(WH_KEYBOARD_LL, KeyboardHookProcedure, Marshal.GetHINSTANCE(Assembly.GetExecutingAssembly().GetModules()[0]), 0);
                Process curProcess = Process.GetCurrentProcess();
                ProcessModule curModule = curProcess.MainModule;
                hKeyboardHook = SetWindowsHookEx(WH_KEYBOARD_LL,
                    KeyboardHookProcedure,
                    GetModuleHandle(curModule.ModuleName),
                    0);
                if (hKeyboardHook == 0)
                {
                    Stop();
                    Console.WriteLine("SetWindowsHookEx ist failed.");
                    throw new Exception("SetWindowsHookEx ist failed.");
                }
            }
            //   install   Mouse   hook   
            if (hMouseHook == 0)
            {
                //   Create   an   instance   of   HookProc. 
                MouseHookProcedure = new HookProc(this.MouseHookProc);
                Process curProcess = Process.GetCurrentProcess();
                ProcessModule curModule = curProcess.MainModule;
                //curProcess.Threads[0].Id;
                hMouseHook = SetWindowsHookEx(WH_MOUSE_LL,
                    MouseHookProcedure,
                    GetModuleHandle(curModule.ModuleName),
                    0);//curProcess.Id//Process.GetCurrentProcess().Id
                //If   SetWindowsHookEx   fails. 
                if (hMouseHook == 0)
                {
                    Stop();
                    Console.WriteLine("SetWindowsHookEx   failed. ");
                    throw new Exception("SetWindowsHookEx   failed. ");
                }
            }
        }
        public void Stop()
        {
            bool retMouse = true;
            bool retKeyboard = true;
            if (hMouseHook != 0)
            {
                retMouse = UnhookWindowsHookEx(hMouseHook);
                hMouseHook = 0;
            }
            if (hKeyboardHook != 0)
            {
                retKeyboard = UnhookWindowsHookEx(hKeyboardHook);
                hKeyboardHook = 0;
            }
            //如果卸下钩子失败 
            if (!(retKeyboard))
            {
                Console.WriteLine("UnhookWindowsHookEx failed.");
                throw new Exception("UnhookWindowsHookEx failed.");
            }
        }
        private const int WM_MOUSEMOVE = 0x200;
        private const int WM_LBUTTONDOWN = 0x201;
        private const int WM_RBUTTONDOWN = 0x204;
        private const int WM_MBUTTONDOWN = 0x207;
        private const int WM_LBUTTONUP = 0x202;
        private const int WM_RBUTTONUP = 0x205;
        private const int WM_MBUTTONUP = 0x208;
        private const int WM_LBUTTONDBLCLK = 0x203;
        private const int WM_RBUTTONDBLCLK = 0x206;
        private const int WM_MBUTTONDBLCLK = 0x209;
        private int MouseHookProc(int nCode, Int32 wParam, IntPtr lParam)
        {
            //   if   ok   and   someone   listens   to   our   events 
            if ((nCode >= 0) && (OnMouseActivity != null))
            {
                MouseButtons button = MouseButtons.None;
                switch (wParam)
                {
                    case WM_LBUTTONDOWN://鼠标左键
                    case WM_LBUTTONUP:
                    case WM_LBUTTONDBLCLK:
                        button = MouseButtons.Left;
                        break;
                    case WM_RBUTTONDOWN://鼠标右键
                    case WM_RBUTTONUP:
                    case WM_RBUTTONDBLCLK:
                        button = MouseButtons.Right;
                        break;
                    //case WM_MBUTTONDOWN:
                    //    //case   WM_MBUTTONUP:   
                    //    //case   WM_MBUTTONDBLCLK:   
                    //    button = MouseButtons.Middle;
                    //    break;
                    default:
                        break;
                }
                int clickCount = 0;
                if (button != MouseButtons.None)
                {
                    if (wParam == WM_LBUTTONDBLCLK || wParam == WM_RBUTTONDBLCLK || wParam == WM_MBUTTONDBLCLK)
                    {
                        clickCount = 2;
                    }
                    else
                    {
                        clickCount = 1;
                    }
                }
                //}
                //Console.WriteLine(clickCount.ToString());
                //Marshall   the   data   from   callback. 
                MouseHookStruct MyMouseHookStruct = (MouseHookStruct)Marshal.PtrToStructure(lParam, typeof(MouseHookStruct));
                MouseEventArgs e = new MouseEventArgs(
                button,
                clickCount,
                MyMouseHookStruct.pt.x,
                MyMouseHookStruct.pt.y,
                0);
                OnMouseActivity(this, e);
            }
            return CallNextHookEx(hMouseHook, nCode, wParam, lParam);
        }
    }
}

Answer 2

using System;
using System.Runtime.InteropServices;
using System.Reflection;
using System.Threading;
using System.Windows.Forms;
using System.Diagnostics;
using System.Collections.Generic;
namespace ConsoleApplicationTest
{

/// <summary>
/// 这个类可以让你得到一个在运行中程序的所有鼠标和键盘事件 (系统钩子)
/// 并且引发一个带KeyEventArgs和MouseEventArgs参数的.NET事件以便你很容易使用这些信息
/// 鼠标钩子处理函数：MouseHookProc
/// 键盘钩子处理函数：KeyboardHookProc
/// 使用方法：
/// 1.新建该类。
/// 2.声明OnMouseActivity、OnKeyDownEvent、OnKeyUpEvent、OnKeyPressEvent.
/// 3.使用时调用相应的事件即可。
/// 4.要添加应用请在MouseHookProc()和KeyboardHookProc()中自己添加。
/// 使用示例：
/// public mkhook = new KeyBordHook();
/// mkhook.OnKeyDownEvent += new KeyEventHandler(OnKeyDownEventHandler);
/// mkhook.OnMouseActivity += new MouseEventHandler(OnMouseEventHandler);
/// private void OnKeyDownEventHandler(object sender, KeyEventArgs e)
/// {
/// Console.WriteLine("KeyDown......");
/// }
/// private void OnMouseEventHandler(object sender, MouseEventArgs e)
/// {
/// Console.WriteLine("MouseEvent......");
/// }
/// </summary>
/// <remarks>
/// 修改:xyan nay6@163.com
/// 修改时间:10.06.11
/// </remarks>
public class KeyBordHook : IDisposable
{
private const int WM_KEYDOWN = 0x100;
private const int WM_KEYUP = 0x101;
private const int WM_SYSKEYDOWN = 0x104;
private const int WM_SYSKEYUP = 0x105;

//全局的事件
public event MouseEventHandler OnMouseActivity;//鼠标事件
public event KeyEventHandler OnKeyDownEvent;//键按下
public event KeyEventHandler OnKeyUpEvent;//键放下
public event KeyPressEventHandler OnKeyPressEvent;//键按下

static int hMouseHook = 0; //鼠标钩子句柄
static int hKeyboardHook = 0; //键盘钩子句柄

//鼠标常量
public const int WH_MOUSE = 7;
public const int WH_MOUSE_LL = 14; //鼠标常量
public const int WH_KEYBOARD_LL = 13; //键盘常量

HookProc MouseHookProcedure; //声明鼠标钩子事件类型.
HookProc KeyboardHookProcedure; //声明键盘钩子事件类型.

//Declare wrapper managed POINT class.
[StructLayout(LayoutKind.Sequential)]
public class POINT
{
public int x;
public int y;
}

//声明鼠标钩子的封送结构类型
[StructLayout(LayoutKind.Sequential)]
public class MouseHookStruct
{
public POINT pt;
public int hwnd;
public int wHitTestCode;
public int dwExtraInfo;
}

//声明键盘钩子的封送结构类型
[StructLayout(LayoutKind.Sequential)]
public class KeyboardHookStruct
{
public int vkCode; //表示一个在1到254间的虚似键盘码
public int scanCode; //表示硬件扫描码
public int flags;
public int time;
public int dwExtraInfo;
}
//装置钩子的函数
[DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
public static extern int SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hInstance, int threadId);

//卸下钩子的函数
[DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
public static extern bool UnhookWindowsHookEx(int idHook);

//下一个钩挂的函数
[DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
public static extern int CallNextHookEx(int idHook, int nCode, Int32 wParam, IntPtr lParam);

[DllImport("user32")]
public static extern int ToAscii(int uVirtKey, int uScanCode, byte[] lpbKeyState, byte[] lpwTransKey, int fuState);

[DllImport("user32")]
public static extern int GetKeyboardState(byte[] pbKeyState);

[DllImport("kernel32.dll", CharSet = CharSet.Auto,
CallingConvention = CallingConvention.StdCall)]
private static extern IntPtr GetModuleHandle(string lpModuleName);

public delegate int HookProc(int nCode, Int32 wParam, IntPtr lParam);

//先前按下的键
public List<Keys> preKeys = new List<Keys>();

/// <summary>
/// 墨认的构造函数构造当前类的实例并自动的运行起来.
/// </summary>
public KeyBordHook()
{
Start();
}

//析构函数.
~KeyBordHook()
{
Stop();
}

public void Dispose()
{
Stop();
}
public void Start()
{
//安装键盘钩子
if (hKeyboardHook == 0)
{
KeyboardHookProcedure = new HookProc(KeyboardHookProc);
//hKeyboardHook = SetWindowsHookEx(WH_KEYBOARD_LL, KeyboardHookProcedure, Marshal.GetHINSTANCE(Assembly.GetExecutingAssembly().GetModules()[0]), 0);
Process curProcess = Process.GetCurrentProcess();
ProcessModule curModule = curProcess.MainModule;

hKeyboardHook = SetWindowsHookEx(WH_KEYBOARD_LL,
KeyboardHookProcedure,
GetModuleHandle(curModule.ModuleName),
0);

if (hKeyboardHook == 0)
{
Stop();
Console.WriteLine("SetWindowsHookEx ist failed.");
throw new Exception("SetWindowsHookEx ist failed.");
}
}

// install Mouse hook
if (hMouseHook == 0)
{
// Create an instance of HookProc.
MouseHookProcedure = new HookProc(this.MouseHookProc);

Process curProcess = Process.GetCurrentProcess();
ProcessModule curModule = curProcess.MainModule;
//curProcess.Threads[0].Id;

hMouseHook = SetWindowsHookEx(WH_MOUSE_LL,
MouseHookProcedure,
GetModuleHandle(curModule.ModuleName),
0);//curProcess.Id//Process.GetCurrentProcess().Id

//If SetWindowsHookEx fails.
if (hMouseHook == 0)
{
Stop();
Console.WriteLine("SetWindowsHookEx failed. ");
throw new Exception("SetWindowsHookEx failed. ");
}
}
}

public void Stop()
{
bool retMouse = true;
bool retKeyboard = true;

if (hMouseHook != 0)
{
retMouse = UnhookWindowsHookEx(hMouseHook);
hMouseHook = 0;
}

if (hKeyboardHook != 0)
{
retKeyboard = UnhookWindowsHookEx(hKeyboardHook);
hKeyboardHook = 0;
}
//如果卸下钩子失败
if (!(retKeyboard))
{
Console.WriteLine("UnhookWindowsHookEx failed.");
throw new Exception("UnhookWindowsHookEx failed.");
}
}

private const int WM_MOUSEMOVE = 0x200;
private const int WM_LBUTTONDOWN = 0x201;
private const int WM_RBUTTONDOWN = 0x204;
private const int WM_MBUTTONDOWN = 0x207;
private const int WM_LBUTTONUP = 0x202;
private const int WM_RBUTTONUP = 0x205;
private const int WM_MBUTTONUP = 0x208;
private const int WM_LBUTTONDBLCLK = 0x203;
private const int WM_RBUTTONDBLCLK = 0x206;
private const int WM_MBUTTONDBLCLK = 0x209;

private int MouseHookProc(int nCode, Int32 wParam, IntPtr lParam)
{
// if ok and someone listens to our events
if ((nCode >= 0) && (OnMouseActivity != null))
{
MouseButtons button = MouseButtons.None;
switch (wParam)
{
case WM_LBUTTONDOWN://鼠标左键
case WM_LBUTTONUP:
case WM_LBUTTONDBLCLK:
button = MouseButtons.Left;
break;
case WM_RBUTTONDOWN://鼠标右键
case WM_RBUTTONUP:
case WM_RBUTTONDBLCLK:
button = MouseButtons.Right;
break;
//case WM_MBUTTONDOWN:
// //case WM_MBUTTONUP:
// //case WM_MBUTTONDBLCLK:
// button = MouseButtons.Middle;
// break;
default:
break;
}
int clickCount = 0;
if (button != MouseButtons.None)
{
if (wParam == WM_LBUTTONDBLCLK || wParam == WM_RBUTTONDBLCLK || wParam == WM_MBUTTONDBLCLK)
{
clickCount = 2;
}
else
{
clickCount = 1;
}
}
//}
//Console.WriteLine(clickCount.ToString());
//Marshall the data from callback.
MouseHookStruct MyMouseHookStruct = (MouseHookStruct)Marshal.PtrToStructure(lParam, typeof(MouseHookStruct));
MouseEventArgs e = new MouseEventArgs(
button,
clickCount,
MyMouseHookStruct.pt.x,
MyMouseHookStruct.pt.y,
0);
OnMouseActivity(this, e);
}
return CallNextHookEx(hMouseHook, nCode, wParam, lParam);
}

private int KeyboardHookProc(int nCode, Int32 wParam, IntPtr lParam)
{
Console.WriteLine("In KeyboardHookProc.");

if ((nCode >= 0) && (OnKeyDownEvent != null || OnKeyUpEvent != null || OnKeyPressEvent != null))
{
KeyboardHookStruct MyKeyboardHookStruct = (KeyboardHookStruct)Marshal.PtrToStructure(lParam, typeof(KeyboardHookStruct));
//当有OnKeyDownEvent 或 OnKeyPressEvent不为null时,ctrl alt shift keyup时 preKeys
//中的对应的键增加
if ((OnKeyDownEvent != null || OnKeyPressEvent != null) && (wParam == WM_KEYDOWN || wParam == WM_SYSKEYDOWN))
{
Keys keyData = (Keys)MyKeyboardHookStruct.vkCode;
if (IsCtrlAltShiftKeys(keyData) && preKeys.IndexOf(keyData) == -1)
{
preKeys.Add(keyData);
Console.WriteLine(keyData.ToString());
}
}
//引发OnKeyDownEvent
if (OnKeyDownEvent != null && (wParam == WM_KEYDOWN || wParam == WM_SYSKEYDOWN))
{
Keys keyData = (Keys)MyKeyboardHookStruct.vkCode;
KeyEventArgs e = new KeyEventArgs(GetDownKeys(keyData));

OnKeyDownEvent(this, e);
}

//引发OnKeyPressEvent
if (OnKeyPressEvent != null && wParam == WM_KEYDOWN)
{
byte[] keyState = new byte[256];
GetKeyboardState(keyState);

byte[] inBuffer = new byte[2];
if (ToAscii(MyKeyboardHookStruct.vkCode,
MyKeyboardHookStruct.scanCode,
keyState,
inBuffer,
MyKeyboardHookStruct.flags) == 1)
{
KeyPressEventArgs e = new KeyPressEventArgs((char)inBuffer[0]);
OnKeyPressEvent(this, e);
}
}

//当有OnKeyDownEvent 或 OnKeyPressEvent不为null时,ctrl alt shift keyup时 preKeys
//中的对应的键删除
if ((OnKeyDownEvent != null || OnKeyPressEvent != null) && (wParam == WM_KEYUP || wParam == WM_SYSKEYUP))
{
Keys keyData = (Keys)MyKeyboardHookStruct.vkCode;
if (IsCtrlAltShiftKeys(keyData))
{

for (int i = preKeys.Count - 1; i >= 0; i--)
{
if (preKeys[i] == keyData)
{
preKeys.RemoveAt(i);
}
}

}
}
//引发OnKeyUpEvent
if (OnKeyUpEvent != null && (wParam == WM_KEYUP || wParam == WM_SYSKEYUP))
{
Keys keyData = (Keys)MyKeyboardHookStruct.vkCode;
KeyEventArgs e = new KeyEventArgs(GetDownKeys(keyData));
OnKeyUpEvent(this, e);
}
}
Console.WriteLine("Out KeyboardHookProc.");
return CallNextHookEx(hKeyboardHook, nCode, wParam, lParam);
}

private Keys GetDownKeys(Keys key)
{
Keys rtnKey = Keys.None;
foreach (Keys keyTemp in preKeys)
{
switch (keyTemp)
{
case Keys.LControlKey:
case Keys.RControlKey:
rtnKey = rtnKey | Keys.Control;
break;
case Keys.LMenu:
case Keys.RMenu:
rtnKey = rtnKey | Keys.Alt;
break;
case Keys.LShiftKey:
case Keys.RShiftKey:
rtnKey = rtnKey | Keys.Shift;
break;
default:
break;
}
}
rtnKey = rtnKey | key;

return rtnKey;
}

private Boolean IsCtrlAltShiftKeys(Keys key)
{

switch (key)
{
case Keys.LControlKey:
case Keys.RControlKey:
case Keys.LMenu:
case Keys.RMenu:
case Keys.LShiftKey:
case Keys.RShiftKey:
return true;
default:
return false;
}
}
}
}