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POUsing CGImageProperties to get EXIF properties
 

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    <p>I want to be able to add a text comment to the metadata of a JPEG and be able to read it back from within an iphone app.</p> <p>I thought this would be fairly simple as ios4 contains support for EXIF info. So I added metadata using a Windows tool called used AnalogExif and read it back from my app using:</p> <pre><code>NSData *jpeg = UIImageJPEGRepresentation(myUIImage,1.0); CGImageSourceRef source = CGImageSourceCreateWithData((CFDataRef)jpeg, NULL); NSDictionary *metadata = (NSDictionary *) CGImageSourceCopyPropertiesAtIndex(source,0,NULL); NSMutableDictionary *metadataAsMutable = [[metadata mutableCopy]autorelease]; [metadata release]; NSMutableDictionary *EXIFDictionary = [[[metadataAsMutable objectForKey:(NSString *)kCGImagePropertyExifDictionary] </code></pre> <p>And that works...to a point :)</p> <p>What I get back in the metadata dictionary is something like:</p> <pre><code>(gdb) po metadata { ColorModel = RGB; Depth = 8; Orientation = 1; PixelHeight = 390; PixelWidth = 380; "{Exif}" = { ColorSpace = 1; PixelXDimension = 380; PixelYDimension = 390; }; "{JFIF}" = { DensityUnit = 0; JFIFVersion = ( 1, 1 ); XDensity = 1; YDensity = 1; }; "{TIFF}" = { Orientation = 1; }; } </code></pre> <p>But thats all I can get! I've edited the JPEG file with every EXIF editor I can find (mostly PC ones I should say) and although they all say I have added JPEG comments and EXIF captions and keywords, none of that info seems to be available from the Apple SDK in my app.</p> <p>Has anyone managed to set a text field in the metadata of a jpeg and manage to read it back from an iphone app?</p> <p>I didn't want to use a third party library if at all possible</p> <p>many thanks in advance</p>
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