CODEWITHSUNDEEP
iphoneobjective-cexif
Raphael Pinto
Raphael Pinto

Reputation: 279

Nil pointer returned for [exifData tagValue:]

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 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

Upvotes: 3

Views: 320

Answers (2)

Raphael Pinto
Raphael Pinto

Reputation: 279

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... :'(

Upvotes: 0

mracoker
mracoker

Reputation: 886

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

Upvotes: 1

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