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?

Answer 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.