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Low-Level Keyboard Hooks

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Submitted on: 1/3/2015 1:31:00 AM
By: RMD Software (from psc cd)  
Level: Advanced
User Rating: By 15 Users
Compatibility: VB.NET
Views: 3949
 
     This is a .net class library (KeyboardLowLevelHook) to capture low-level keyboard events by placing a low-level system hook. Use this to track when a user presses some key / key combinations (in any program) and react to those events. The way these functionalities are exposed is very similar to the .net keyboard input scheme : the KeyboardLowLevelHook provides two events : KeyDown and KeyUp (same as on Windows Forms) that, upon instantiation of the class, fires whenever any key gets pressed / released. You can also prevent (block) key combinations from reaching other programs by setting e.Handled = True in the KeyDown and KeyUp events (see example). Note : Be careful when a KeyboardLowLevelHook is instantiated when debugging : keyboard input will react very slowly since the “hook callback procedure” cannot be called when the program is paused. Low-level keyboard hooks require at least Windows NT 4.0 SP3 to run. *Vote only if you wish to... Voting is voluntary : users should not be forced to vote. If you don't want to vote, that's OK! Simply don't vote!*

 
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//**************************************
// for :Low-Level Keyboard Hooks
//**************************************
Code from the KeyboardLowLevelHook class is heavily based on an article made by “Managing Low-Level Keyboard Hooks in VB .NET” by Paul Kimmel (http://www.developer.com/net/vb/article.php/10926_2193301_3).
Low-level keyboard hooks are very powerful, but they should not be used for bad / illegal activities including, but not limited to, spying, key logging, etc.
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