Re: Is CGImage... thread-safe?
On May 26, 2020, at 16:10:26, Gabriel Zachmann via Cocoa-dev wrote: > > I've just had a crash in > CGImageSourceCreateThumbnailAtIndex( new_image, 0, imageOpts ); We went through this quite a while ago in private emails. CGImageSourceCreateThumbnailAtIndex is fine to use from any thread. Are you sure the image source even has an image at index 0? Not all do. What's the crashed stack look like? -- Steve Mills Drummer, Mac geek ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Is CGImage... thread-safe?
I've just had a crash in CGImageSourceCreateThumbnailAtIndex( new_image, 0, imageOpts ); The new_image and imageOpts were created/assigned just a few lines earlier in the code. (and in the debugger they appear to be non-null.) So I was wondering if CGImageSourceCreateThumbnailAtIndex() is thread-safe. Maybe, it would be more correct to ask whether the CGImage framework is re-entrant. The only other CGImage functions I am using, as far as I can see, are CGImageRelease() and layer.content = image. (The latter is not directly a CGImage function, but it might use them.) These two functions might get called in a different thread - but, of course, never on objects I pass into CGImageSourceCreateThumbnailAtIndex() ! Any ideas as to why I am experiencing the crash, will be appreciated. Best regards, Gabriel smime.p7s Description: S/MIME cryptographic signature ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Screensaver can capture mouse events under Catalina
> >> I can confirm: this is indeed critical. Otherwise, the .saver does not >> receive mouse events. >> >> Unfortunately, it seems that I still cannot get key events. > > If you are trying to get events from arrow or modifier keys, you have to use > keyDown and not keyUp. But you may not be able to get any key events in a > screensaver for security reasons. Yes, I am defining - (void) keyDown: (NSEvent *) theEvent in my ScreenSaverView subclass, but it never gets called. Gab. smime.p7s Description: S/MIME cryptographic signature ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Screensaver can capture mouse events under Catalina
On May 25, 2020, at 3:43 PM, Gabriel Zachmann via Cocoa-dev wrote: > I can confirm: this is indeed critical. Otherwise, the .saver does not > receive mouse events. > > Unfortunately, it seems that I still cannot get key events. If you are trying to get events from arrow or modifier keys, you have to use keyDown and not keyUp. But you may not be able to get any key events in a screensaver for security reasons. Jim Crate ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Screensaver can capture mouse events under Catalina
>> Unfortunately, with -addGlobalMonitorForEventsMatchingMask: , >> the event is still passed on to the higher-up objects, so that makes the >> screensaver engine terminate the screensaver immediately. > > Does this mean you’re unable to set up a global event tap/monitor? If you > are able, how are you setting it up? I didn't try, because, like I said, it would be of no use to me, even if it did work, because the screensaver engine would still receive the event, and kill the screensaver immediately. Best regards, Gabriel smime.p7s Description: S/MIME cryptographic signature ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Screensaver can capture mouse events under Catalina
Gabriel,
> On May 26, 2020, at 04:21, Gabriel Zachmann wrote:
>
> Thanks a lot for your response!
>
> Unfortunately, with -addGlobalMonitorForEventsMatchingMask: ,
> the event is still passed on to the higher-up objects, so that makes the
> screensaver engine terminate the screensaver immediately.
Does this mean you’re unable to set up a global event tap/monitor? If you are
able, how are you setting it up?
Sandor
>
> Best regards, Gabriel
>
>
>
>> On 26. May 2020, at 00:54, Sandor Szatmari
>> wrote:
>>
>> Gabriel, (this is a dup reply, forgot to cc list)
>>
>> How are you setting up you global event monitor?
>>
>> I use this to handle catching mouse moved event when my app is not in the
>> foreground…. maybe you use something like this
>> Just watch out for a lot of events and making your app a CPU hog.
>>
>> [NSEvent addGlobalMonitorForEventsMatchingMask:NSMouseMovedMask
>> handler:
>>^(NSEvent * _Nonnull event)
>>{
>> // Do stuff to handle events that I care about
>>}];
>>
>> Sandor
>
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Re: Screensaver can capture mouse events under Catalina
Thanks a lot for your response!
Unfortunately, with -addGlobalMonitorForEventsMatchingMask: ,
the event is still passed on to the higher-up objects, so that makes the
screensaver engine terminate the screensaver immediately.
Best regards, Gabriel
> On 26. May 2020, at 00:54, Sandor Szatmari
> wrote:
>
> Gabriel, (this is a dup reply, forgot to cc list)
>
> How are you setting up you global event monitor?
>
> I use this to handle catching mouse moved event when my app is not in the
> foreground…. maybe you use something like this
> Just watch out for a lot of events and making your app a CPU hog.
>
>[NSEvent addGlobalMonitorForEventsMatchingMask:NSMouseMovedMask
> handler:
> ^(NSEvent * _Nonnull event)
> {
>// Do stuff to handle events that I care about
> }];
>
> Sandor
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