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A simple wrapper around exiv2
Ruby C++
branch: master

Merge pull request #12 from gogiel/extern_c

Removed unnecessary extern "C"
latest commit c6a304e9eb
@johnsyweb johnsyweb authored

README.md

Exiv2

Build Status

A simple wrapper around the C++ Exiv2 libary for reading and writing image metadata.

See http://www.exiv2.org/

Requires that the exiv2 C++ library is installed.

Usage

gem install exiv2

if you get errors with header could not be found, please explicitly declare the header path

gem install exiv2 -- --with-exiv2-include="${EXIV2_PREFIX}/include" --with-exiv2-lib="${EXIV2_PREFIX}/lib"

on OSX with Homebrew's exiv2, the EXIV2_PREFIX can be set:

export EXIV2_PREFIX=$(brew --prefix exiv2)

Once everything is successfully installed, you can give it a go:

require 'exiv2'
image = Exiv2::ImageFactory.open("image.jpg")
image.read_metadata
image.iptc_data.each do |key, value|
  puts "#{key} = #{value}\n"
end
image.exif_data.each { ... }
image.xmp_data.each { ... }

iptc_data_hash  = image.iptc_data.to_hash
xmp_data_hash   = image.xmp_data.to_hash

image.exif_data.delete("Exif.Image.Software")
image.iptc_data.delete_all("Iptc.Application2.Keywords")

image.iptc_data["Iptc.Application2.Caption"] = "A New Caption"
image.iptc_data.add("Iptc.Application2.Keywords", "fishy")

image.write_metadata

Why?

None of the existing Ruby libraries for reading and writing image metadata did quite what we wanted, so we figured it wouldn't be too hard to wrap enough of Exiv2 to meet our needs.

The intention is to just mirror the Exiv2 API in Ruby, so the path to extending this to support more of Exiv2's functionality should be straightforward. Patches are welcome.

Compatibility

Tested on 1.9.3, 2.0.x and 2.1.x with Exiv2 0.24

Developing

  • Fork the project.
  • Make your feature addition or bug fix.
  • Add tests for it. This is important so I don't break it in a future version unintentionally.
  • Commit, do not mess with rakefile, version, or history. (if you want to have your own version, that is fine but bump version in a commit by itself I can ignore when I pull)
  • Send me a pull request. Bonus points for topic branches.

Status

In early development. Very little of Exiv2's API is supported, and it hasn't been heavily tested.

Contributors

Pete Yandell, Mark Turnley, Lucas Parry, Norbert Wojtwoicz, Jan Graichen, John Barton

Copyright

Copyright (c) 2014 Envato & Pete Yandell. See LICENSE for details.

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