From: 12 34 <rubyforum@...>
Date: 2007-05-13T01:26:17+09:00
Subject: Re: EXIF Library

Jeremy Hinegardner wrote:
> On Sat, May 12, 2007 at 11:44:53AM +0900, 12 34 wrote:
>> Newbie here. What's the syntax to read say the date and time the picture 
>> was taken?
>> 
> 
> Example program to display exif tags.
> 
>     > cat exif-test.rb
>     require 'rubygems'
>     require 'exifr'
> 
>     image_file = ARGV.first
>     exif_info = nil
>     case image_file.downcase
>     when /.jpg\Z/
>         exif_info = EXIFR::JPEG.new(image_file)
>     when /.tiff?\Z/
>         exif_info = EXIFR::TIFF.new(image_file)
>     end
> 
>     puts "Standard items".center(72)
>     puts "=" * 72
>     puts "                          File : #{image_file}"
>     puts "                        Height : #{exif_info.height}"
>     puts "                         Width : #{exif_info.width}"
>     puts
> 
>     if exif_info.exif? then
>         puts "EXIF information".center(72)
>         puts "=" * 72
>         h = exif_info.exif.to_hash
>         h.each_pair do |k,v|
>             puts "#{k.to_s.rjust(30)} : #{v}"
>         end
>     else
>         puts "No EXIF information in this image"
>     end
> 
> Running that program on an image
> 
>     > ruby exif-test.rb 2004120087.JPG
>                                     Standard items
>     ========================================================================
>                               File : 2004120087.JPG
>                             Height : 1200
>                              Width : 1600
> 
>                                 EXIF information
>     =============================================================== <snip-snip long output> 
enjoy,
> 
> -jeremy
Jeremy
I am enjoying. Learned several things with your help. "require" for 
example. And some other nice details about outputting. I got it working 
by simplifying the beginning. I didn't understand two lines:
cat exif-test.rb
or
image_file = ARGV.first
lines.

As I changed the script it works for me. But in the interest of 
learning. I'm waiting for Black's book before going much further.

Thanks again.

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