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I've had some great success adding EXIF data to an images captured from the UIImagePickerControl...Mostly following the examples from other questions. i.e.

  1. UIImagePickerController and extracting EXIF data from existing photos
  2. Problem setting exif data for an image

BUT I've never managed to (set and then later retreive) the ImageUniqueID tag (kCGImagePropertyExifImageUniquID)

I've tried vairous combinations:

NSMutableDictionary *EXIFDictionary = [[[metadataAsMutable objectForKey:(NSString *)kCGImagePropertyExifDictionary]mutableCopy]autorelease];

[EXIFDictionary setObject:@"1234" forKey:(NSString*)kCGImagePropertyExifImageUniquID];

//[EXIFDictionary setObject[NSNumber numberWithInt:1234] forKey:(NSString*)kCGImagePropertyExifImageUniquID];

[metadataAsMutable setObject:EXIFDictionary forKey:(NSString *)kCGImagePropertyExifDictionary];

//then save the mutable data back to Image

All the other EXIF, TIFF, and IPTC keys I set using this method are succesfully saved and then retrieved later using similar methods.

Any Idea how to set this value?

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Smudger5201
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  • can't using the Linux 'exif' tool either, here's the error: "jcomeau@aspire:~$ exif --ifd=EXIF --tag=0xa420 --set-value=0x1234 -o has_id.jpg peaceful_coexistence.jpg Setting a value for this tag is unsupported!" – jcomeau_ictx Jul 09 '13 at 23:17

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