Microsoft KB Archive/106717

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INFO: Journal Hooks and Compatibility

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Q106717

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The information in this article applies to:


 * Microsoft Win32 Application Programming Interface (API), used with:
 * the operating system: Microsoft Windows NT, versions 3.1, 3.5
 * the operating system: Microsoft Windows 2000

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SUMMARY
Journal hooks are used to record and play back events, such as keyboard and mouse events. Journal hooks are system-wide hooks that take control of all user input, and therefore should be used as little as possible.

MORE INFORMATION
Note that Windows NT does not ship with a Recorder application, as Windows 3.1 does. Therefore, it may be desirable to create an application that can play back macros recorded under Windows 3.1. However, there are a number of different problems with the Windows NT implementation of journaling that make it difficult to use macros recorded under Windows 3.1. The EVENTMSG structures recorded under Windows 3.1 that hold keystrokes do not play back under Windows NT. They must be modified, because the journal playback hook parses a scan code out of the EVENTMSG structure differently than the Windows 3.1 journal record hook put it in the structure. Under Windows 3.1, paramH specifies the repeat count. Under Windows NT, there is no way to specify a repeat count; it is always assumed to be 1.

For more information on hooks, please see the Hooks Overview in Volume 1 of the Win32 "Programmer's Reference" and the article "Win32 Hooks" included in the MSDN CD #5.

Additional query words:

Keywords : kbHook kbOSWinNT350 kbOSWinNT351 kbOSWin2000 kbSDKWin32 kbGrpDSUser

Issue type : kbinfo

Technology : kbAudDeveloper kbWin32sSearch kbWin32API