Subclassing & hooking with visual basic

Stephen Teilhet

674 pages, parution le 01/08/2001

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Résumé

Subclassing & Hooking with Visual Basic offers developers a unique way to customize Windows behavior.
Windows is a message-based system. Every action a user requests creates one or more messages to carry out the action. These messages are passed between objects and carry with them information that gives the recipient more detail on how to interpret and act upon the message.
With Subclassing and the Windows hooking mechanism ("hooks"), a developer can manipulate, modify, or even discard messages bound for other objects within the operating system, in the process changing the way the system behaves. What kinds of results can developers achieve using the power of subclassing and hooking? Here are just a few of the possibilities:
Determine when a window is being activated or deactivated and respond to this change.
Display descriptions of menu items as the mouse moves across them.
Disallow a user to move or resize a window.
Determine where the mouse cursor is and respond accordingly.
Determine when the display resolution has been changed.
Monitor the system for a low system resource condition.
Modify or disallow keystrokes sent to a window or a control.
Create an automated testing application.
Determine when an application is idle.
Along with this power comes responsibility; Windows is very unforgiving if subclassing and hooking are used incorrectly. Subclassing & Hooking with Visual Basic demonstrates the various techniques for intercepting messages bound for one or more windows or controls:the intercepted message can be left in its original state or modified; afterwards, the message can be sent to its original destination or discarded.
Subclassing & Hooking with Visual Basic opens up a wealth of possibilities to the Visual Basic developer—possibilities that ordinarily are completely unavailable, or at least not easy to implement.

Contents

Preface
Introducing Subclassing and Hooking
Introduction
Windows System-Specific Information
The Basics of Subclassing and Hooks
Subclassing and Superclassing
Subclassing
Subclassing the Windows Common Dialog Boxes
ActiveX Controls and Subclassing
Superclassing
Debugging Techniques for Subclassing
Hooking
WH_CALLWNDPROC
WH_CALLWNDPROCRET
WH_GETMESSAGE
WH_KEYBOARD and WH_KEYBOARD_LL
WH_MOUSE and WH_MOUSE_LL
WH_FOREGROUNDIDLE
WH_MSGFILTER
WH_SYSMSGFILTER
WH_SHELL
WH_CBT
WH_JOURNALRECORD
WH_JOURNALPLAYBACK
WH_DEBUG
The .NET Platform
Implementing Hooks in VB.NET
Appendixes
Index

Caractéristiques techniques

	PAPIER
Éditeur(s)	O'Reilly
Auteur(s)	Stephen Teilhet
Parution	01/08/2001
Nb. de pages	674
Format	18 x 23
Couverture	Broché
Poids	1000g
Intérieur	Noir et Blanc
EAN13	9780596001186
ISBN13	978-0-596-00118-6