On Feb 17, 2020, at 04:17:26, Gabriel Zachmann via Cocoa-dev
<cocoa-dev@lists.apple.com> wrote:
>
> One of my users (maybe, they others don't bother)
> told me that occasionally, they get an error message that must originate from
> this piece of code in my screensaver:
>
> NSURL * url = [NSURL fileURLWithPath: [self absolutePathFor: filename_]
> isDirectory: NO];
> if ( url == NULL )
> {
> ... // never happened so far
> }
> CGImageSourceRef sourceRef = CGImageSourceCreateWithURL( (CFURLRef) url,
> NULL );
> if ( sourceRef == NULL )
> {
> [self displayErrorMessage: @"Image gone: " with: filename_];
> ...
> }
>
> He gets the error message "Image gone" - but when he checks that path, the
> image is there alright.
>
> Does anyone have an idea what might be causing CGImageSourceCreateWithURL to
> return NULL?
> Is there anything I can do to get to the bottom of this erratic behavior?
Does your screensaver need permission to access each folder or file? Does your
screensaver have permission to use the Pictures folder (if that's the source of
the images)? Do you save URLs in prefs? If so, do you store security scoped
bookmarks, then resolve them on load, and have balanced calls to
startAccessingSecurityScopedResource and stopAccessingSecurityScopedResource?
Have you watched the console to see if any other info is being reported (filter
on "screensaver" get both ScreenSaverEngine and legacyScreenSaver messages)?
--
Steve Mills
Drummer, Mac geek
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