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API call for Windows2000 to lock the keyboard

Posted on 2004-08-16
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Last Modified: 2013-11-13
Hi,
I have created a VB application to lock the computer (VB6) using the
following APIS:
clipcursor
getwindowrect
systemparamtersinfo (SPI_SCREENSAVERRUNNING)

The mechanism is that when the user locks the windows, the getwindowrect API gets the rectangular region of the form and clips the cursor so that it cannot move on the desktop. The Systemparamtersinfo API then locks the keyboard until the user enters the required password in the vb6 application. This app works fine under windows 98. However, under windows 2000 the systemparametersinfo(SPI_SCREENSAVERRUNNING) doesnot work. As a result,
the keyboard shortcuts such as CTL-ALT-DEL and CTL-TAB work even when
my VB6 application has locked the cursor within the rectangular region
of the form. Is there any alternative to the Systemparametersinfo API
that can do the lock the keyboard (not to the application but to
the rest of the windows)

THnaks
Rafay
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Question by:rbali2004
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2 Comments
 
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Expert Comment

by:Jase-Coder
ID: 11813218
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Accepted Solution

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zonaltech earned 125 total points
ID: 11830677
Here's an example project that uses the keyboard hooking and mouse restriction you are talking about:

http://www.planet-source-code.com/vb/scripts/ShowCode.asp?txtCodeId=54463&lngWId=1

It disables low level keys in NT, 2000, and XP.

Hope it helps!
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