[DUG] Detecting screensaver

[Conor Boyd]

Wouldn't surprise me if the preview button doesn't exhibit the same
behaviour.

Screensavers have to be written to respond explicitly to being run in
preview mode (they basically have to parent themselves to the window
handle of the preview window which is passed to them when they're
executed in Preview mode).

I believe your test is the correct approach, John (as backed up here:
http://stackoverflow.com/questions/510734/how-to-determine-that-a-screen
saver-is-running and with my own experience of writing a screensaver in
Delphi).

Rather than using the Preview button, you could easily rustle up a
little utility to kick the screensaver into life by broadcasting the
appropriate window message:
  Perform(WM_SYSCOMMAND, SC_SCREENSAVE, 0 );

HTH,

Conor

-----Original Message-----
From: delphi-bounces at delphi.org.nz [mailto:delphi-bounces at delphi.org.nz]
On Behalf Of John Bird
Sent: Wednesday, 10 June 2009 3:38 p.m.
To: NZ Borland Developers Group - Delphi List
Subject: Re: [DUG] Detecting screensaver

I have seen that variant, but from what I saw this detects the
screensaver is set, not that it is active?

>From the D7 win32 help:

"SPI_GETSCREENSAVEACTIVE Determines whether screen saving is enabled.
The pvParam parameter must point to a BOOL variable that receives TRUE
if enabled, or FALSE otherwise."

In my tests the above always returns true, as I do have a screen saver
enabled, and it does not return a changing status if the screen saver is
on at the moment or not. (I was using the control panel screen saver
preview button to check this).

I am trying to detect if a screensaver is currently actually running

John

> I'm using SystemParametersInfo(SPI_GETSCREENSAVEACTIVE, 0, 
> @ATScreenSaverOn, 0); It works on Vista here
>
> Paul
>
> ----- Original Message -----
> From: "John Bird" <johnkbird at paradise.net.nz>
> To: "NZ Borland Developers Group - Delphi List" <delphi at delphi.org.nz>
> Sent: Tuesday, June 09, 2009 7:30 AM
> Subject: [DUG] Detecting screensaver
>
>
>> Does anyone know a reliable way to detect if the screensaver is on?  
>> The way I have found references to on the web
>>
>> SystemParametersInfo(SPI_GETSCREENSAVERRUNNING, 0, @ATScreenSaverOn, 
>> 0);
>>
>> Note this is documented as Windows 95 only, which I am guessing why 
>> it doesn't work (XP/Vista)
>>
>> The only other way I can think of is to try to find the full name of 
>> the foreground program and see if it has a .SCR extension, but I am 
>> not confident that would work.
>>
>> John
>>
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