Re: WinRT keep display on

Hi David,

unfortunately that was the only message of the exception, "a function being 
called at an unexpected time".

I have googled a bit and found a suggestion to keep the DisplayRequest 
object that the requestActive() was called on for the corresponding 
requestRelease() call. This code does at least not crash immediately:


DisplayRequest ^ request = nullptr;

void SetKeepDisplayOn(int keepOn)
{

    if (request == nullptr)
    {
        request = ref new DisplayRequest();
        if (keepOn != 0)
        {
            request->RequestActive();
        }
        else
        {
            SDL_Log("Error: Trying to release display although not 
acquired!\n");
        }
    }
    else
    {
        if (keepOn == 0)
        {
            request->RequestRelease();
            request = nullptr;
        }
        else
        {
            SDL_Log("Error: Trying to acquire display although already 
acquired!\n");
        }
    }
}

but I can't say whether this is really correct and without side effects, 
esp. w.r.t. the lifetime of DisplayRequest objects. Can you please take a 
look at this code for obvious defects?

Regards,

Daniel




---------- Původní zpráva ----------
Od: David Ludwig <[email protected]>
Komu: SDL Development List <[email protected]>
Datum: 27. 8. 2016 15:29:14
Předmět: Re: [SDL] WinRT keep display on

"

I'm not sure why this call isn't working.  SDL's main thread on WinRT is, at
present, typically the main thread.



Did the exception contain any more info?




I can plan on looking into this when I get a chance, hopefully in within the
next few weeks, but make no guarantees.




-- David L.









On Sat, Aug 27, 2016 at 7:54 AM, hardcoredaniel <[email protected]
(mailto:[email protected])> wrote:
"
Hi David,

I'm trying to keep the screen programmatically on for some time, but I'm not
doing it right. This is my simple code:

--------------------------

    using namespace Windows::System::Display;

    DisplayRequest ^ request = ref new DisplayRequest();

    if (keepOn != 0)
    {
        request->RequestActive();
    }
    else
    {
        request->RequestRelease();
    }

---------------------------

but there must be sth. fundamentally wrong with it, because when I call 
RequestRelease() I get an exception from WinRT about calling something at an
unexpected time. I'm calling it from SDL's main thread, which is probably 
not the UI thread.

I saw in your code for the game bar that you are using something called a 
"dispatcher", I suppose this is to run sth. on the UI thread. Do I need to 
do the same for DisplayRequest()? Anything else I have missed?


Regards,

Daniel



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