C#实现可捕获几乎所有键盘鼠标事件的钩子类完整实例

using System;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;
namespace MouseKeyboardLibrary
{
  /// <summary>
  /// Captures global keyboard events
  /// </summary>
  public class KeyboardHook : GlobalHook
  {
    #region Events
    public event KeyEventHandler KeyDown;
    public event KeyEventHandler KeyUp;
    public event KeyPressEventHandler KeyPress;
    #endregion
    #region Constructor
    public KeyboardHook()
    {
      _hookType = WH_KEYBOARD_LL;
    }
    #endregion
    #region Methods
    protected override int HookCallbackProcedure(int nCode, int wParam, IntPtr lParam)
    {
      bool handled = false;
      if (nCode > -1 && (KeyDown != null || KeyUp != null || KeyPress != null))
      {
        KeyboardHookStruct keyboardHookStruct =
          (KeyboardHookStruct)Marshal.PtrToStructure(lParam, typeof(KeyboardHookStruct));
        // Is Control being held down?
        bool control = ((GetKeyState(VK_LCONTROL) & 0x80) != 0) ||
                ((GetKeyState(VK_RCONTROL) & 0x80) != 0);
        // Is Shift being held down?
        bool shift = ((GetKeyState(VK_LSHIFT) & 0x80) != 0) ||
               ((GetKeyState(VK_RSHIFT) & 0x80) != 0);
        // Is Alt being held down?
        bool              ((GetKeyState(VK_RALT) & 0x80) != 0);
        // Is CapsLock on?
        bool capslock = (GetKeyState(VK_CAPITAL) != 0);
        // Create event using keycode and control/shift/alt values found above
        KeyEventArgs e = new KeyEventArgs(
          (Keys)(
            keyboardHookStruct.vkCode |
            (control ? (int)Keys.Control : 0) |
            (shift ? (int)Keys.Shift : 0) |
            (alt ? (int)Keys.Alt : 0)
            ));
        // Handle KeyDown and KeyUp events
        switch (wParam)
        {
          case WM_KEYDOWN:
          case WM_SYSKEYDOWN:
            if (KeyDown != null)
            {
              KeyDown(this, e);
              handled = handled || e.Handled;
            }
            break;
          case WM_KEYUP:
          case WM_SYSKEYUP:
            if (KeyUp != null)
            {
              KeyUp(this, e);
              handled = handled || e.Handled;
            }
            break;
        }
        // Handle KeyPress event
        if (wParam == WM_KEYDOWN &&
          !handled &&
          !e.SuppressKeyPress &&
          KeyPress != null)
        {
          byte[] keyState = new byte[256];
          byte[] inBuffer = new byte[2];
          GetKeyboardState(keyState);
          if (ToAscii(keyboardHookStruct.vkCode,
               keyboardHookStruct.scanCode,
               keyState,
               inBuffer,
               keyboardHookStruct.flags) == 1)
          {
            char key = (char)inBuffer[0];
            if ((capslock ^ shift) && Char.IsLetter(key))
              key = Char.ToUpper(key);
            KeyPressEventArgs e2 = new KeyPressEventArgs(key);
            KeyPress(this, e2);
            handled = handled || e.Handled;
          }
        }
      }
      if (handled)
      {
        return 1;
      }
      else
      {
        return CallNextHookEx(_handleToHook, nCode, wParam, lParam);
      }
    }
    #endregion
  }
}

								 
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