From: Han Holl <han.holl@...>
Date: 2005-12-13T20:59:27+09:00
Subject: LocalJumpError

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Hi,

Because ruby-libexif no longer works with libexif-0.6.12, I decided to roll
my own Exif class.
Quick and dirty.
And got a surprising error message.

Here's the program:
#!/usr/bin/ruby

#require 'exif'

class Exif < Hash
  @@want =3D %w{ DateTimeOriginal DateTime ImageDescription PixelYDimension=
 }
  def initialize(file)

    IO.popen("exiv2 -pt '#{file}'") do |h|
      h.each do |line|
        a =3D line.split[0].split(/\./)[2].strip
        if @@want.include?(a)
          self[a] =3D line[60 .. -1].strip
        end
      end
    end
  end
end

def run
  exif =3D Exif.new('/var/pictures/alpujaras/img_0528_edited.jpg')
  puts exif['DateTimeOriginal']
  exif =3D Exif.new('/bin/ls')
  puts exif['DateTimeOriginal']
  next if exif.empty?
  puts "won't get here"
end

run
### End-of-ruby-program

If I run this, I get:
2005:01:04 13:22:48
Exiv2 exception in print action for file /bin/ls:
/bin/ls: The file contains data of an unknown image type
nil
./add_captions.rb:25:in `run': unexpected next (LocalJumpError)
        from ./add_captions.rb:29

For a real JPEG it works fine, but things get ugly otherwise:

I can't quite figure out what this means.

Cheers,

Han Holl

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