A Ruby Gem for scanning QR codes from documents like PDFs and images.

Install the gem and add to the application's Gemfile by executing:

bundle add qr_code_scanner

If bundler is not being used to manage dependencies, install the gem by executing:

gem install qr_code_scanner

Install the required NPM packages:

yarn add @andreekeberg/imagedata pdf-to-png-converter jsqr

This gem is built on top of the jsQR NPM package, which means you need to be running Node.js. We utilize the nodo gem for calling out to Node.js.

TL;DR: as long as you have Node.js installed and the above listed NPM packages installed you shouldn't notice that it's calling out to Node.js.

Given the following QR Code:

You can read out it's information using:

require "qr_code_scanner"

QRCodeScanner.scan("path/to/qr_code.png")
# => ["hello world"]

After checking out the repo, run bin/setup to install dependencies. Then, run rake test to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and the created tag, and push the .gem file to rubygems.org.

Bug reports and pull requests are welcome on GitHub at https://github.com/marcoroth/qr_code_scanner. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the code of conduct.

Everyone interacting in the QRCodeScanner project's codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.