关于鼠标和键盘的全局获取的一个类 选择自 hbxtlhx 的 Blog

用这个类的方法Start可以开始捕获键盘和鼠标的在全局事件和相应的参数信息，也就所谓的钩子程序：
以前见一个高人写的一个程序，开始看不明白，经过我的＂反译＂变的好理解了些，拿来和大家共享一下：

得到鼠标的消息的类：

using System;
using System.Runtime.InteropServices;
using System.Reflection;
using System.Threading;
using System.Windows.Forms;

namespace HookGlobal
{
 
 /// <summary>
 /// 这个类可以让你得到一个在运行中程序的所有鼠标事件
 /// 并且引发一个带MouseEventArgs参数的.NET鼠标事件以便你很容易使用这些信息
 /// </summary>
 /// <remarks>
 /// </remarks>
 public class MouseHook
 {
  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;

  //全局的事件
  public event MouseEventHandler OnMouseActivity;

  static int hMouseHook = 0; //鼠标钩子句柄

  //鼠标常量
  public const int WH_MOUSE_LL  = 14; //mouse hook constant

  HookProc MouseHookProcedure; //声明鼠标钩子事件类型.

  //声明一个Point的封送类型
  [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;
  }

  //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); 

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

  /// <summary>
  /// 墨认的构造函数构造当前类的实例.
  /// </summary>
  public MouseHook()
  {
   //Start();
  }

  //析构函数.
  ~MouseHook()
  {
   Stop();
  }

  public void Start()
  {
   //安装鼠标钩子
   if(hMouseHook == 0)
   {
    //生成一个HookProc的实例.
    MouseHookProcedure = new HookProc(MouseHookProc);

    hMouseHook = SetWindowsHookEx( WH_MOUSE_LL, MouseHookProcedure, Marshal.GetHINSTANCE(Assembly.GetExecutingAssembly().GetModules()[0]), 0);

    //如果装置失败停止钩子
    if(hMouseHook == 0 ) 
    {
     Stop();
     throw new Exception("SetWindowsHookEx failed.");
    }
   }
  }

  public void Stop()
  {
   bool retMouse =true;
   if(hMouseHook != 0)
   {
    retMouse = UnhookWindowsHookEx(hMouseHook);
    hMouseHook = 0;
   }
   
   //如果卸下钩子失败
   if (!(retMouse)) throw new Exception("UnhookWindowsHookEx failed.");
  }

  private int MouseHookProc(int nCode, Int32 wParam, IntPtr lParam)
  {
   //如果正常运行并且用户要监听鼠标的消息
   if ((nCode >= 0) && (OnMouseActivity!=null))
   { 
    MouseButtons button=MouseButtons.None;
    int clickCount=0;

    switch (wParam)
    {
     case WM_LBUTTONDOWN:
      button=MouseButtons.Left;
      clickCount=1;
      break;
     case WM_LBUTTONUP:
      button=MouseButtons.Left;
      clickCount=1;
      break;
     case WM_LBUTTONDBLCLK:
      button=MouseButtons.Left;
      clickCount=2;
      break;
     case WM_RBUTTONDOWN:
      button=MouseButtons.Right;
      clickCount=1;
      break;
     case WM_RBUTTONUP:
      button=MouseButtons.Right;
      clickCount=1;
      break;
     case WM_RBUTTONDBLCLK:
      button=MouseButtons.Right;
      clickCount=2;
      break;
    }

    //从回调函数中得到鼠标的信息
    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);
  }
 }
}

得到键盘消息的类：

using System;
using System.Runtime.InteropServices;
using System.Reflection;
using System.Threading;
using System.Windows.Forms;

namespace HookGlobal
{
 
 /// <summary>
 /// 这个类可以让你得到一个在运行中程序的所有键盘或鼠标事件
 /// 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
 /// </summary>
 /// <remarks>
 ///  修改:lihx
 ///  修改时间:04.11.8
 /// </remarks>
 public class KeyBordHook
 {
  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 KeyEventHandler OnKeyDownEvent;
  public event KeyEventHandler OnKeyUpEvent;
  public event KeyPressEventHandler OnKeyPressEvent;

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

  //鼠标常量
  public const int WH_KEYBOARD_LL = 13; //keyboard hook constant 

  HookProc KeyboardHookProcedure; //声明键盘钩子事件类型.

  //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);

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

  /// <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 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);

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

  public void Stop()
  {
   bool retKeyboard = true;
   
   if(hKeyboardHook != 0)
   {
    retKeyboard = UnhookWindowsHookEx(hKeyboardHook);
    hKeyboardHook = 0;
   }
   //如果卸下钩子失败
   if (!(retKeyboard)) throw new Exception("UnhookWindowsHookEx failed.");
  }

  private int KeyboardHookProc(int nCode, Int32 wParam, IntPtr lParam)
  {
   if ((nCode >= 0) && (OnKeyDownEvent!=null || OnKeyUpEvent!=null || OnKeyPressEvent!=null))
   {
    KeyboardHookStruct MyKeyboardHookStruct = (KeyboardHookStruct) Marshal.PtrToStructure(lParam, typeof(KeyboardHookStruct));
    //引发OnKeyDownEvent
    if ( OnKeyDownEvent!=null && ( wParam ==WM_KEYDOWN || wParam==WM_SYSKEYDOWN ))
    {
     Keys keyData=(Keys)MyKeyboardHookStruct.vkCode;
     KeyEventArgs e = new KeyEventArgs(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);
     }
    }
    
    //引发OnKeyUpEvent
    if ( OnKeyUpEvent!=null && ( wParam ==WM_KEYUP || wParam==WM_SYSKEYUP ))
    {
     Keys keyData=(Keys)MyKeyboardHookStruct.vkCode;
     KeyEventArgs e = new KeyEventArgs(keyData);
     OnKeyUpEvent(this, e);
    }
   }
   return CallNextHookEx(hKeyboardHook, nCode, wParam, lParam);
  }
 }
}

本文地址：http://com.8s8s.com/it/it42903.htm