gamedevlists-windows

RE: [GD-Windows] Detecting locked screen

[Steve L. <st...@mi...>]

You can check if it has happened:

bool CheckForDesktopAvailable(void)
{
    bool bAvailable =3D false;
   =20
    // Check to see if the desktop is locked
    HDESK hDesk =3D OpenDesktop("Default", 0, FALSE,
DESKTOP_SWITCHDESKTOP);
    if (hDesk)
    {
        if (SwitchDesktop(hDesk) !=3D 0)
        {
            bAvailable =3D true;
        }

        CloseDesktop(hDesk);
    }

    return (bAvailable);
}
=20
AFAIK there is no message to tell you when it happens...

-----Original Message-----
From: gam...@li...
[mailto:gam...@li...] On Behalf Of
Brian Hook
Sent: Wednesday, September 22, 2004 11:33 AM
To: gam...@li...
Subject: [GD-Windows] Detecting locked screen

I'm trying to detect when the user has chosen to lock their workstation
(via Task Manager or an app that calls LockWorkStation() directly), and
I can't seem to find a simple way of doing this.

I don't need to do anything, I just need to know if it's occurred or
not.  I was hoping there was some WM_LOCKWORKSTATION or something
equivalent, but the nearest I can find is WM_ENDSESSION which isn't
quite what I'm looking for.  There is no WM_SYSCOMMAND type that is
appropriate as well.

Most stuff I see recommend installing a GINA DLL, but that may not be
possible since the workstation user might have limited rights.

If it's something as cheezy as doing a FindWindow for the Logon screen,
that would work too, but I'm not sure what that window is called or if
it's present all the time and just invisible unless locked, etc.

Any pointers appreciated.

Thanks,

Brian




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RE: [GD-Windows] Detecting locked screen

[Lewin, G. <gl...@ea...>]

What you want are winlogon notification events

http://msdn.microsoft.com/library/default.asp?url=3D/library/en-us/secaut=
h
n/security/winlogon_notification_packages.asp=20


_________________________________________
Gareth Lewin - http://www.garethlewin.com

"Facts are useless. You can use facts to prove anything that's even
remotely true. Facts shmacts!" -- Homer Jay Simpson.
-----Original Message-----
From: Brian Hook [mailto:ho...@bo...]=20
Sent: Wednesday, September 22, 2004 1:56 PM
To: gam...@li...
Subject: RE: [GD-Windows] Detecting locked screen

> You can check if it has happened:

Thanks, that helps, but it doesn't quite solve it.  SwitchDesktop() will
still fail if the screen saver has turned on but the actual lock hasn't
occurred.

There is a very brief interval (under a couple seconds) when the screen
saver kicks in and it WON'T lock the desktop, and
SwitchDesktop() will fail then even if the desktop hasn't actually been
locked (i.e. you can tap a key or move the mouse and the screensaver
turns off and there's no logon box).

Basically I'm looking for a fictitious API that is like:

if ( WorkstationLocked() )
....

Failing that, being able to process a LockWorkstation() or whatever
would do the trick as well.

Thanks,

Brian




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RE: [GD-Windows] Detecting locked screen

[Brian H. <ho...@bo...>]

> What you want are winlogon notification events

Which require installing a DLL which I believe requires Admin 
privileges (the stuff I've seen requires you to edit HKLM in the 
registry).  So unfortunate I can't use that =3D/

Brian

RE: [GD-Windows] Detecting locked screen

[Lewin, G. <gl...@ea...>]

Ok, another option is

http://msdn.microsoft.com/library/default.asp?url=3D/library/en-us/termse=
r
v/termserv/wtssession_notification_str.asp

But that's xp only. :(=20


_________________________________________
Gareth Lewin - http://www.garethlewin.com

"Facts are useless. You can use facts to prove anything that's even
remotely true. Facts shmacts!" -- Homer Jay Simpson.
-----Original Message-----
From: Brian Hook [mailto:ho...@bo...]=20
Sent: Wednesday, September 22, 2004 5:12 PM
To: gam...@li...
Subject: RE: [GD-Windows] Detecting locked screen

> What you want are winlogon notification events

Which require installing a DLL which I believe requires Admin privileges
(the stuff I've seen requires you to edit HKLM in the registry).  So
unfortunate I can't use that =3D/

Brian




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This SF.Net email is sponsored by: YOU BE THE JUDGE. Be one of 170
Project Admins to receive an Apple iPod Mini FREE for your judgement on
who ports your project to Linux PPC the best. Sponsored by IBM.
Deadline: Sept. 24. Go here: http://sf.net/ppc_contest.php
_______________________________________________
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RE: [GD-Windows] Detecting locked screen

[Brian H. <ho...@bo...>]

> You can check if it has happened:

Thanks, that helps, but it doesn't quite solve it.  SwitchDesktop() 
will still fail if the screen saver has turned on but the actual lock 
hasn't occurred.

There is a very brief interval (under a couple seconds) when the 
screen saver kicks in and it WON'T lock the desktop, and 
SwitchDesktop() will fail then even if the desktop hasn't actually 
been locked (i.e. you can tap a key or move the mouse and the 
screensaver turns off and there's no logon box).

Basically I'm looking for a fictitious API that is like:

if ( WorkstationLocked() )
....

Failing that, being able to process a LockWorkstation() or whatever 
would do the trick as well.

Thanks,

Brian