[vlc-devel] [PATCH]Win32 screensaver disable change part II

[Kaarlo Räihä]

2011/5/3 Geoffroy Couprie <geo.couprie at gmail.com>

> Hello,
>
> On Tue, May 3, 2011 at 4:04 PM, Juha Jeronen <juha.jeronen at jyu.fi> wrote:
> >
> > Hi,
> >
> > On 05/03/11 15:43, Rémi Denis-Courmont wrote:
> >>
> >>    Hello,
> >>
> >> On Tuesday 03 May 2011, Juha Jeronen wrote:
> >>>
> >>> - Have an instance data struct for the thread, containing only an exit
> >>> flag (initialized to false in the main thread, just before it starts
> the
> >>> new thread). Malloc it, and pass a pointer as the thread argument. The
> >>> flag will be used for signaling.
> >>
> >> Oh no, never suggest that. This does not fit our (POSIX) threaded memory
> >> synchronization model.
> >
> > Ok.
> >
> >>> - When the main thread wants to shut down the screensaver prevention
> >>> thread, it sets the exit flag to true.
> >>> - When the thread notices that its exit flag has been set to true, it
> >>> joins.
> >>> - Finally, we need to take care of the 50-second sleep. How about,
> >>> instead of
> >>
> >> No. Polling timers are for incompetent programmers.
> >
> > I did say it was no good :P
> >
> >
> >> In this case, the thread can sleep for 50 seconds, and be terminated by
> thread
> >> cancellation. Alternetiavely, it can use a condition variable and a
> 50-seconds
> >> time-out.
> >
> > This sounds good.
> >
>
> Thinking a bit out of the box here: did you try applying the method
> shown in http://msdn.microsoft.com/en-us/library/cc144066(VS.85).aspx
> ?
>
> "Windows does not start the screen saver if [...] the active
> application receives the WM_SYSCOMMAND message with the wParam
> parameter set to the SC_SCREENSAVE value, but it does not pass the
> message to the DefWindowProc function."
>
> Basically, you set up a GetMessage loop (in Qt or in the vout), and
> when you receive a WM_SYSCOMMAND with SC_SCREENSAVE or
> SC_MONITORPOWER, you don't pass it to DefWindowProc. It will block the
> screensaver or the monitor power off, unless the user has set a
> password policy on the screensaver.
>

Those won't work in certain situations (like screensaver with password you
mentioned + some message loop design issues cause problems).
http://stackoverflow.com/questions/463813/programmatically-prevent-windows-screensaver-from-starting
http://www.codeguru.com/forum/archive/index.php/t-304863.html

AFAIK there isn't any sane way to prevent screensavers under Windows if the
software itself doesn't provide inputs.


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