Class: PrintClient::PrintLabels

Inherits:
Object
  • Object
show all
Defined in:
lib/print_client.rb

Instance Method Summary collapse

Constructor Details

#initialize ⇒ PrintLabels

Returns a new instance of PrintLabels.



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# File 'lib/print_client.rb', line 37

def initialize
  config = YAML::load_file("./virtusprinter.yml")
  @vp_computer = config['virtusprinter']['computer']
end

Instance Method Details

#start ⇒ Object 



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# File 'lib/print_client.rb', line 41

def start
  virtus_printer = VirtusPrinter.new
  log = Logger.new('log.txt', shift_age = 5, shift_size = 6048576)
  log.level = Logger::DEBUG
  log.debug 'Started logging'
  while true
    begin
      sleep 1
      result = false
      data = {}
      time = Benchmark.realtime do
        result, data = virtus_printer.get_labels(@vp_computer)
      end
      log.debug "Time spent in virtusprinter: #{time}"
      unless result
        print " #{virtus_printer.error} "
        next
      end
      print '.'

      xml_doc = Nokogiri::XML(data)
      labels = xml_doc.css("labels label")
      next if labels.count == 0

      # Open all required ports
      ports = {}
      labels.each do |l|
        port = l.at_css('port').content
        unless ports.include?(port)
          ports[port] = SerialPort.new(port, 9600, 8, 1)
          # Wait forever to receive printer response
          ports[port].read_timeout = 0
          # Enable error reporting
          ports[port].write "US"
        end
      end

      # Print labels
      labels.each do |l|
        label_id = l.at_css('id').content
        port = l.at_css('port').content
        epl = l.at_css('epl').content
        print 'p'
        if epl.nil? || epl == ''
          next
        else
          epl.encode!('ISO-8859-1')
          ports[port].write(epl)
          while true
            byte = ports[port].getbyte
            # The label was printed successfully
            break if byte == ACK
            # There was an error, read all error bytes
            break if byte == XOFF
          end
        end
      end

      # Update labels
      labels.each do |l|
        label_id = l.at_css('id').content
        print 'u'
        result = virtus_printer.update_label label_id, 'PRINTED'
        puts virtus_printer.error if result == false
      end

      # Close all ports
      ports.each_value{ |port| port.close}

    rescue Interrupt => e
      log.error e
      exit
    rescue SystemCallError => e
      log.error e
      puts e
    rescue SocketError => e
      log.error e
      print ' SocketError '
    rescue Exception => e
      log.error e
      puts e.class
      puts e
    end
  end
end