C#底层键盘勾子类

作者:C/S框架网发布日期:2011/05/05 23:22:05

C#底层键盘勾子类

Low-level keyboard intercept class to trap and suppress system keys

底层键盘勾子类, 来源网络。

C# Code:

/// KEYBOARD.CS
/// (c) 2006 by Emma Burrows
/// This file contains the following items:
/// - KeyboardHook: class to enable low-level keyboard hook using
///    the Windows API.
/// - KeyboardHookEventHandler: delegate to handle the KeyIntercepted
///    event raised by the KeyboardHook class.
/// - KeyboardHookEventArgs: EventArgs class to contain the information
///    returned by the KeyIntercepted event.
///
/// Change history:
/// 17/06/06: 1.0 - First version.
/// 18/06/06: 1.1 - Modified proc assignment in constructor to make class backward
///                 compatible with 2003.
/// 10/07/06: 1.2 - Added support for modifier keys:
///                 -Changed filter in HookCallback to WM_KEYUP instead of WM_KEYDOWN
///                 -Imported GetKeyState from user32.dll
///                 -Moved native DLL imports to a separate internal class as this
///                  is a Good Idea according to Microsoft's guidelines
/// 13/02/07: 1.3 - Improved modifier key support:
///                 -Added CheckModifiers() method
///                 -Deleted LoWord/HiWord methods as they weren't necessary
///                 -Implemented Barry Dorman's suggestion to AND GetKeyState
///                  values with 0x8000 to get their result
/// 23/03/07: 1.4 - Fixed bug which made the Alt key appear stuck
///                 - Changed the line
///                     if (nCode >= 0 && (wParam == (IntPtr)WM_KEYUP || wParam == (IntPtr)WM_SYSKEYUP))
///                   to
///                     if (nCode >= 0)
///                     {
///                        if (wParam == (IntPtr)WM_KEYUP || wParam == (IntPtr)WM_SYSKEYUP)
///                        ...
///                   Many thanks to "Scottie Numbnuts" for the solution.

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