This is a gem enabled version with some additional features of the ruby wrapper for libdmtx that can be found at: https://github.com/dmtx/dmtx-wrappers

The original README file is renamed as libdmtx-README.

gem install Rdmtx

• libdmtx
• rmagick

require 'rmagick'
require 'Rdmtx'
rdmtx = Rdmtx.new
i = rdmtx.encode("Hello you !!", 5, 5)
i.write("output.png")

See test.rb for a decode example.

rdmtx.new

rdmtx.encode(String, MarginSize, ModuleSize, SizeRequest)

Creates and returns an rmagick image object by encoding String with (optional arguments) margin MarginSize, module ModuleSize, and request a particular size of the output SizeRequest.

• MarginSize is the margin in number of pixels
• ModuleSize is the size of one module in number of pixels
• SizeRequest has to be one of pre-defined constants like: DmtxSymbolSquareAuto, DmtxSymbol10x10, etc.. See ext/rdmtx/Rdmtx.c for a full listing of the possible values.

rdmtx.decode(Image, Timeout)

Decodes the rmagick image object Image within Timeout.

sudo apt install software-properties-common
sudo apt-add-repository -y ppa:rael-gc/rvm
sudo apt update
sudo apt install rvm
sudo apt install libmagickwand-dev libdmtx-dev
rvm install 2.7

rvm use 2.7@ruby-dmtx
gem build Rdmtx.gemspec

gem install ./Rdmtx-0.5.0.gem
./test.rb
./test.rb output.png

gem push Rdmtx-0.5.0.gem