I'm trying to read EXIF data from pictures taken with the apple camera's application, containning EXIF informations. I use iphone-exif library available at http://code.google.com/p/iphone-exif/.
My problem is that I succes getting tag informations with [exifData tagDefinition:] function :
EXFTag* tag = [exifData tagDefinition:[NSNumber numberWithInt:EXIF_ExposureTime]];
Tag information are开发者_运维知识库 correctly displayed in console :
tag name : ExposureTime
tag dataType : 5 tag ID : 33434 tag components : 1 tag adress : 0x15f900
but I can't get the tag value :
id value = [exifData tagValue: [NSNumber numberWithInt:EXIF_ExposureTime]];
I get nil pointer :
value adress : 0x0 value size : 4 value content : 0
Results are exactly the same with other tag ID like ISO Speed ratings or Focal Length.
Do I made something wrong? Is the library dysfunctional?
Raphael
If you are using the UIImagePickerController then you will not have exif data. I tried this also.
Here is more information: UIImagePickerController and extracting EXIF data from existing photos
There is no solution. As said mracoker, if I use UIImagePickerController to take pictures OR to open pictures from user's photo album, no EXIF informations are included. That's realy bad for my proffesional training... :'(
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