LPrint A Label Printer Application

LPrint implements printing for a variety of common label and receipt printers connected via network or USB. Features include:

  • A single executable handles spooling, status, and server functionality.
  • Multiple printer support.
  • Each printer implements an IPP Everywhere™ print service and is compatible with the driverless printing support in iOS, macOS, and Linux clients.
  • Each printer can support options such as label modes, tear-off offsets, media tracking, media top offset, print darkness, resolution, roll selection, and speed.
  • Each printer can print “raw”, Apple/PWG Raster, and/or PNG files.
  • Each printer automatically recovers from out-of-media, power loss, and disconnected/bad cable issues.

Requirements

LPrint depends on:

  • A “make” program (both GNU and BSD make are known to work),
  • A C99 compiler (both Clang and GCC are known to work),
  • Avahi 0.7 or later or mDNSResponder to provide DNS-SD support,
  • CUPS 2.2.0 or later to provide HTTP, IPP, and Apple/PWG Raster support,
  • libpng 1.6.0 or later to provide PNG printing support, and
  • libusb 1.0 or later to provide USB printing support.

Supported Printers

The following printers are currently supported:

  • Dymo LabelWriter printers
  • Zebra ZPL printers

Others will be added as time and access to printers permits.

Standards

LPrint implements PWG 5100.14-2013: IPP Everywhere™ for each printer, and has a partial implementation of PWG 5100.22-2019: IPP System Service v1.0 for managing the print queues and default printer.

IPP extensions for label printers have been proposed in the Printer Working Group in the IPP Label Printing Extensions v1.0 document; LPrint will be updated to conform to the final names and values that are approved by the IPP workgroup.

LPrint is Copyright © 2019-2020 by Michael R Sweet.

LPrint is licensed under the Apache License Version 2.0 with an exception to allow linking against GPL2/LGPL2 software (like older versions of CUPS). See the files “LICENSE” and “NOTICE” for more information.

LPrint is based loosely on the “ippeveprinter.c” and “rastertolabel.c” code from CUPS.

News

LPrint v1.0 February 17, 2020

LPrint v1.0rc1 February 10, 2020

LPrint v1.0b2 January 26, 2020

LPrint v1.0b1 January 15, 2020

Announcing LPrint, a Label Printer Application January 13, 2020