Encoding::UndefinedConversionError: "\x89" from ASCII-8BIT to UTF-8

[Ziyan Junaideen]

Abstract

Error recorded in production server trying to create a bar-code. Is this a bug in the lib or some thing we are doing wrong? Thanks in advance.

Details

The bar-code creation process works fine, but last night Rollbar had recorded an error. We are using v0.6.3 and the error received is as follows.

• Version 0.6.3
• Order ID = 1145

require 'barby'
require 'barby/barcode/code_128'
require 'barby/outputter/ascii_outputter'
require 'barby/outputter/png_outputter'

class Admin::OrdersController < AdminController
  def print
    @order = Order.find(params[:id])
    @order_id = sprintf '%010d', @order.id                                                                                                        

   @barcode = Barby::Code128B.new(@order_id) 
    bar_code_image_path  = Rails.root.join('public/bar_codes',"#{@order.id}.png" )                                                                
    File.open(bar_code_image_path , 'w'){|f|
      f.write @barcode.to_png(:height => 50, :margin => 15) # The line which the error happens                                                                                      
    }

    render layout: 'print'
end

Resulting error

Encoding::UndefinedConversionError: "\x89" from ASCII-8BIT to UTF-8
1 File "/home/rails/production/releases/20160506183304/app/controllers/admin/orders_controller.rb" line 79 in write
2 File "/home/rails/production/releases/20160506183304/app/controllers/admin/orders_controller.rb" line 79 in block in print
3 File "/home/rails/production/releases/20160506183304/app/controllers/admin/orders_controller.rb" line 78 in open
4 File "/home/rails/production/releases/20160506183304/app/controllers/admin/orders_controller.rb" line 78 in print

[Tore Darell]

This is one of two things:

1. The data you're giving to Code128B is not marked as being binary "encoded".
2. The file you're writing to has not been opened as binary.

1. Code128B assumes data given to it is in Encoding::BINARY/Encoding::ASCII_8BIT and marked as such. It must be.
2. The file being opened must also use this encoding as it will write binary data.