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Lock Windows XP through my application

Posted on 2007-11-28
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Last Modified: 2013-12-01
I need to write a Delphi application:

- After logging to Windows XP it must be the first program to run.
- When my program starts it will ask user for some authentication information.
- After validation, user will have access to windows during some pre-defined time.
After this time the user need to do another validation to get more time to work.
I want to protect my program being disabled by the user after he gets authenticated.

Thanks
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Question by:jclobocar
6 Comments
 
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Eddie Shipman earned 400 total points
ID: 20368867
Well, you could create a screen shot of the desktop and put it in a borderless form and show that form on top of everything then popup a system modal window asking for the login credentials.
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by:ziolko
ID: 20371941
>>- After logging to Windows XP it must be the first program to run.

that's touhg since some services are starting during system startup

>> I want to protect my program being disabled by the user after he gets authenticated.

this is gonna be easier you can catch WM_CLOSE and return non-zero value but this will prevent only gracefull shutdown user always can run task manager and kill process.

In general the best solution for your problem would be creating your own GINA DLL (just like netware does) but this is hell lot of code

ziolko.
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by:jclobocar
ID: 20372329
Where do I put in the information to start my program?
Is there an way of hidding my process in the task list?
How machines at cyber cafes does something like what I want?
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by:Eddie Shipman
ID: 20373419
Most of them write GINAs. There is Delphi GINA code here:
http://knightgina.sourceforge.net/
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Expert Comment

by:Steven-Fernandez
ID: 20476751
If you are the only user in XP you don't get the lock option.

This is a simple trick

Part 1:

Create a shortcut:

View Properties:

Change target to:

%windir%\system32\rundll32.exe user32.dll, LockWorkStation

Place it where ever you want.

Part2:

Add ShellApi to your uses section

 ShellExecute(0,
               nil,
               'c:\thelinkpath\lockit.lnk',
               nil,
               nil,
               SW_SHOWNORMAL);

This will lock the desktop on XP even if the option is not available.

Hope this helps.
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Expert Comment

by:Steven-Fernandez
ID: 20644386
Did you try. I use it myself and it works perfectly.
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