Getting Error Trying to Create AspectRatioThumbnail from Image I/O

Question

I'm trying to create an aspect ratio thumbnail from an ALAsset for pre iOS5 (the ALAssetDefaultRepresentation aspectRatioThumbnail wasn't implemented until ios5). I have the following code and it's giving me an error for some reason:

CGImageRef imref;
    NSURL* url = [self.photoAsset.defaultRepresentation url];
    NSDictionary *dictionary = [NSDictionary dictionaryWithObjectsAndKeys:
                       (id)kCFBooleanTrue, kCGImageSourceShouldAllowFloat,
                       (id)kCFBooleanTrue, kCGImageSourceCreateThumbnailWithTransform,
                       (id)kCFBooleanTrue, kCGImageSourceCreateThumbnailFromImageAlways,
                       [NSNumber numberWithInteger:1024], kCGImageSourceThumbnailMaxPixelSize, nil];
    CGImageSourceRef src = CGImageSourceCreateWithURL((CFURLRef)url, NULL);
    imref = CGImageSourceCreateThumbnailAtIndex(src, 0, (CFDictionaryRef) dictionary);

Specifically I'm getting:

ImageIO: <ERROR>  CGImageSourceCreateWithURL CFURLCreateDataAndPropertiesFromResource failed with error code -11.ImageIO: <ERROR>  CGImageSourceCreateThumbnailAtIndex image source parameter is nil

Anyone know what's going on?

I've put an answer on this question about how to generate a from an ALAsset: http://stackoverflow.com/questions/11765340/generating-custom-thumbnail-from-alassetrepresentation/13941431#13941431 — Jesse Rusak, Dec 18 '12 at 21:08

score 1 · Accepted Answer · answered May 14 '12 at 20:58

1

The problem is with the url that you are passing to create 'src', check wether url is valid and there exists some image at this url.

answered May 14 '12 at 20:58

Ravin

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I think the URL I'm retrieving isn't for the image, but for the asset itself. Any idea how to get the image URL? – Ser Pounce May 16 '12 at 00:01

Getting Error Trying to Create AspectRatioThumbnail from Image I/O

1 Answers1