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More fun with CGImageSourceCreateWithURL
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More fun with CGImageSourceCreateWithURL


  • Subject: More fun with CGImageSourceCreateWithURL
  • From: Gabriel Zachmann via Cocoa-dev <email@hidden>
  • Date: Mon, 17 Feb 2020 11:17:26 +0100

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?


Best regards, Gabriel


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