>
> Given a URL to an image I currently do this to grab image properties
> (ignoring error handling to simplify the example code)
>
> let imgRef = CGImageSourceCreateWithURL(url as CFURL, nil)
> let imgProps = CGImageSourceCopyPropertiesAtIndex(imgRef, 0, nil) as
> NSDictionary?
> let GPSDictionary = kCGImagePropertyGPSDictionary as NSString
> let gpsData = imgProps[GPSDictionary] as? [String: AnyObject]
>
I am not sure this will solve the problem, but the following code works for me,
albeit I have not tested it on CR3 images.
Also , you should take it with a grain of salt, because I am not sure about the
correctness of the Retain/Release's under ARC.
If you want, you can send my an example CR3 file, and I can check whether my
code will extract more info.
Best regards, Gabriel
// get meta data
CFDictionaryRef gps_dict;
success = CFDictionaryGetValueIfPresent( fileProps,
kCGImagePropertyGPSDictionary, (const void **) & gps_dict );
if ( success && gps_dict )
{
CFRetain( gps_dict );
CFNumberRef gps_long = NULL, gps_lat = NULL;
success = CFDictionaryGetValueIfPresent( gps_dict,
kCGImagePropertyGPSLongitude,
(const void **) & gps_long );
success |= CFDictionaryGetValueIfPresent( gps_dict,
kCGImagePropertyGPSLatitude,
(const void **) & gps_lat );
CFStringRef gps_longref = NULL, gps_latref = NULL;
success |= CFDictionaryGetValueIfPresent( gps_dict,
kCGImagePropertyGPSLongitudeRef,
(const void **) & gps_longref
);
success |= CFDictionaryGetValueIfPresent( gps_dict,
kCGImagePropertyGPSLatitudeRef,
(const void **) & gps_latref
);
if ( success )
{
success = CFNumberGetValue( gps_lat, kCFNumberDoubleType, imglat );
if ( success && gps_latref &&
CFStringCompare(gps_latref, CFSTR("S"), 0) == kCFCompareEqualTo
)
*imglat = - *imglat;
success = CFNumberGetValue( gps_long, kCFNumberDoubleType, imglong
);
if ( success && gps_longref &&
CFStringCompare(gps_longref, CFSTR("W"), 0) ==
kCFCompareEqualTo )
*imglong = - *imglong;
}
CFRelease( gps_dict );
}
// retreieve IPTC metadata
CFDictionaryRef iptc_dict;
success = CFDictionaryGetValueIfPresent( fileProps,
kCGImagePropertyIPTCDictionary, (const void **) & iptc_dict );
if ( success && iptc_dict )
{
CFRetain( iptc_dict );
CFArrayRef img_keywords = NULL; // contrary to the doc, it is
an array, not a string!
success = CFDictionaryGetValueIfPresent( iptc_dict,
kCGImagePropertyIPTCKeywords,
(const void **) & img_keywords
);
if ( img_keywords )
{
NSArray * imgkeywords = (__bridge NSArray * _Nonnull) img_keywords;
*imgkeyword = [[NSString alloc] initWithString: imgkeywords[0] ];
}
CFStringRef caption = NULL;
success = CFDictionaryGetValueIfPresent( iptc_dict,
kCGImagePropertyIPTCCaptionAbstract, (const void **) & caption );
if ( success && caption )
{
*imgcaption = [[NSString alloc] initWithString: (__bridge NSString
* _Nonnull)(caption)];
}
CFRelease( iptc_dict );
}
// retreieve EXIF metadata
CFDictionaryRef exif_dict;
success = CFDictionaryGetValueIfPresent( fileProps,
kCGImagePropertyExifDictionary, (const void **) & exif_dict );
if ( success && exif_dict )
{
CFRetain( exif_dict );
CFStringRef dateref = NULL;
success = CFDictionaryGetValueIfPresent( exif_dict,
kCGImagePropertyExifDateTimeOriginal, (const void **) & dateref );
if ( success )
{
*date = [[NSString alloc] initWithString: (__bridge NSString *
_Nonnull)(dateref)];
}
CFRelease( exif_dict );
}
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