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    <p>Have you took a look at this exif iPhone library?</p> <p><a href="http://code.google.com/p/iphone-exif/" rel="nofollow noreferrer">http://code.google.com/p/iphone-exif/</a></p> <p>Gonna try it on my side. I'd like to get the GPS (geotags) coordinates from the picture that has been taken with the UIImagePickerController :/</p> <p>After a deeper look, this library seems to take NSData info as an input and the UIImagePickerController returns a UIImage after taking a snapshot. In theory, if we use the selected from the UIkit category for UIImage</p> <pre><code>NSData * UIImageJPEGRepresentation ( UIImage *image, CGFloat compressionQuality ); </code></pre> <p>Then we can convert the UIImage into a NSData instance and then use it with the iPhone exif library.</p> <p>UPDATE:<BR/> I gave a test to the library mentioned above and it seems to work. However because of my limited knwoledge about the EXIF format and the lack of high level API in the library, I don't manage to get the values for the EXIF tags. Here's my code in case any of you can go further : </p> <pre><code> #import "EXFJpeg.h" - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingImage:(UIImage *)image editingInfo:(NSDictionary *)editingInfo { NSLog(@"image picked %@ with info %@", image, editingInfo); NSData* jpegData = UIImageJPEGRepresentation (image,0.5); EXFJpeg* jpegScanner = [[EXFJpeg alloc] init]; [jpegScanner scanImageData: jpegData]; EXFMetaData* exifData = jpegScanner.exifMetaData; EXFJFIF* jfif = jpegScanner.jfif; EXFTag* tagDefinition = [exifData tagDefinition: [NSNumber numberWithInt:EXIF_DateTime]]; //EXFTag* latitudeDef = [exifData tagDefinition: [NSNumber numberWithInt:EXIF_GPSLatitude]]; //EXFTag* longitudeDef = [exifData tagDefinition: [NSNumber numberWithInt:EXIF_GPSLongitude]]; id latitudeValue = [exifData tagValue:[NSNumber numberWithInt:EXIF_GPSLatitude]]; id longitudeValue = [exifData tagValue:[NSNumber numberWithInt:EXIF_GPSLongitude]]; id datetime = [exifData tagValue:[NSNumber numberWithInt:EXIF_DateTime]]; id t = [exifData tagValue:[NSNumber numberWithInt:EXIF_Model]]; .... .... </code></pre> <p>The retrieving of tags definition is OK, but all tag values returns <code>nil</code> :(</p> <p>In case you want to give a try to the library, you need to define a global variable to get it running (as explained in the doc but hum.. :/)</p> <p><code>BOOL gLogging = FALSE;</code></p> <p>UPDATE 2<BR/> Answer here : <a href="https://stackoverflow.com/questions/616346/iphone-access-location-information-from-a-photo/616371#616371">iPhone - access location information from a photo</a> <B>A UIImage does not encapsulate the meta information</B>, so we're stuck : for sure, no EXIF info will be given through this interface.</p> <p><B>FINAL UPDATE</B><BR/> Ok I managed to get it working, at least to geotag properly pictures returned by the picker.<BR/> <B>Before triggering the UIImagePickerController, it's up to you to use the CLLocationManager to retrieve the current CLocation</B><BR/> Once you have it, you can use this method that uses exif-iPhone library to geotag the UIImage from the CLLocation : <PRE> <code> -(NSData*) geotagImage:(UIImage*)image withLocation:(CLLocation*)imageLocation { NSData* jpegData = UIImageJPEGRepresentation(image, 0.8); EXFJpeg* jpegScanner = [[EXFJpeg alloc] init]; [jpegScanner scanImageData: jpegData]; EXFMetaData* exifMetaData = jpegScanner.exifMetaData; // end of helper methods // adding GPS data to the Exif object NSMutableArray* locArray = [self createLocArray:imageLocation.coordinate.latitude]; EXFGPSLoc* gpsLoc = [[EXFGPSLoc alloc] init]; [self populateGPS: gpsLoc :locArray]; [exifMetaData addTagValue:gpsLoc forKey:[NSNumber numberWithInt:EXIF_GPSLatitude] ]; [gpsLoc release]; [locArray release]; locArray = [self createLocArray:imageLocation.coordinate.longitude]; gpsLoc = [[EXFGPSLoc alloc] init]; [self populateGPS: gpsLoc :locArray]; [exifMetaData addTagValue:gpsLoc forKey:[NSNumber numberWithInt:EXIF_GPSLongitude] ]; [gpsLoc release]; [locArray release]; NSString* ref; if (imageLocation.coordinate.latitude &lt;0.0) ref = @"S"; else ref =@"N"; [exifMetaData addTagValue: ref forKey:[NSNumber numberWithInt:EXIF_GPSLatitudeRef] ]; if (imageLocation.coordinate.longitude &lt;0.0) ref = @"W"; else ref =@"E"; [exifMetaData addTagValue: ref forKey:[NSNumber numberWithInt:EXIF_GPSLongitudeRef] ]; NSMutableData* taggedJpegData = [[NSMutableData alloc] init]; [jpegScanner populateImageData:taggedJpegData]; [jpegScanner release]; return [taggedJpegData autorelease]; }</p> <p>// Helper methods for location conversion -(NSMutableArray*) createLocArray:(double) val{ val = fabs(val); NSMutableArray* array = [[NSMutableArray alloc] init]; double deg = (int)val; [array addObject:[NSNumber numberWithDouble:deg]]; val = val - deg; val = val*60; double minutes = (int) val; [array addObject:[NSNumber numberWithDouble:minutes]]; val = val - minutes; val = val*60; double seconds = val; [array addObject:[NSNumber numberWithDouble:seconds]]; return array; } -(void) populateGPS:(EXFGPSLoc* ) gpsLoc :(NSArray*) locArray{ long numDenumArray[2]; long* arrPtr = numDenumArray; [EXFUtils convertRationalToFraction:&amp;arrPtr :[locArray objectAtIndex:0]]; EXFraction* fract = [[EXFraction alloc] initWith:numDenumArray[0]:numDenumArray[1]]; gpsLoc.degrees = fract; [fract release]; [EXFUtils convertRationalToFraction:&amp;arrPtr :[locArray objectAtIndex:1]]; fract = [[EXFraction alloc] initWith:numDenumArray[0] :numDenumArray[1]]; gpsLoc.minutes = fract; [fract release]; [EXFUtils convertRationalToFraction:&amp;arrPtr :[locArray objectAtIndex:2]]; fract = [[EXFraction alloc] initWith:numDenumArray[0] :numDenumArray[1]]; gpsLoc.seconds = fract; [fract release]; } </code> </PRE></p>
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    1. POUIImagePickerController and extracting EXIF data from existing photos
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    1. COYes, that's what I originally tried. But thanks for your efforts - if you come across another way, it'd be great if you let us know here.
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    2. COI'm going to try to geotag the photo on my own using the exif iphone library, I'll keep you informed (seems "simple" from the user guide but not really straight forward... :/)
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    3. COThanks yonel, but I'm actually looking to fetch the EXIF information from photos taken by the Camera app.
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