C#底层键盘勾子类
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。
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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.
/// 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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