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Escpos

A ruby implementation of ESC/POS (thermal) printer command specification.

Installation

Add this line to your application's Gemfile:

gem 'escpos'

# see https://github.com/escpos/escpos-image
gem 'escpos-image' # add this if you want to print images

And then execute:

$ bundle

Or install it yourself as:

$ gem install escpos

Image support

To keep this gem lightweight and modular image support was implemented in another gem:

https://github.com/escpos/escpos-image

# Add this line to your application's Gemfile if you want to print images
gem 'escpos-image'
# And depending on your image processor of choice
gem 'mini_magick'
# or
gem 'chunky_png'

Or install it yourself as:

gem install escpos-image
# and then depending on your image processor of choice
gem install mini_magick
# or
gem install chunky_png

For more information about image processors, their options and supported formats please see https://github.com/escpos/escpos-image readme file.

Examples

Basic usage

@printer = Escpos::Printer.new
@printer << "Some text"
@printer << Escpos::Helpers.big "Big text"

@printer.to_escpos # returns ESC/POS data ready to be sent to printer
# on linux this can be piped directly to /dev/usb/lp0
# with network printer sent directly to printer socket
# with serial port printer it can be sent directly to the serial port

@printer.to_base64 # returns base64 encoded ESC/POS data

Report class usage

# my_report.rb:
class MyReport < Escpos::Report
  def item(text)
    @count ||= 0
    @count += 1
    bold "#{@count}. #{text}"
  end

  def order
    options[:order]
  end
end

<% # my_report.erb: %>
<%= big "Order number #{order[:number]}" %>
<%= item "First item" %>
<%= item "Second item" %>
<%= item "Third item" %>

report = MyReport.new 'path/to/my_report.erb', {
  order: { number: 123 }
}
@printer << report.render
@printer.cut!

# @printer.to_escpos or @printer.to_base64 contains resulting ESC/POS data

Available helper methods

Method name	Description
text	Normal text formatting
encode	Encode text for the printer
encoding, set_encoding, set_printer_encoding	Set printer encoding
double_height	Double height text
quad_text, big, title, header, double_width_double_height, double_height_double_width	Double width & Double height text
double_width	Double width text
underline, u	Underlined text
underline2, u2	Stronger underlined text
bold, b	Bold text
left	Align to left
right	Align to right
center	Align to center
invert, inverted	Color inverted text
black, default_color, color_black, black_color	Default Color (Usually black)
red, alt_color, alternative_color, color_red, red_color	Alternative Color (Usually Red)
barcode	Print barcode
partial_cut	Partially cut the paper (may not be available on all devices)
cut	Fully cut the paper (may not be available on all devices)

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/escpos/escpos.

1. Fork it ( https://github.com/escpos/escpos/fork )
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create a new Pull Request