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python-escpos/doc/user/barcode.rst

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fix printing of CODE128 The control sequence {A or {B or {C can't be part of the qr code. For this the user has to supply this sequence.
2016-08-01 10:24:07 +00:00
Printing Barcodes
-----------------
New high level barcode method. Closes #245, #244. (#527) * Merge software and hardware barcodes to one method * Fix wrong sw barcode heigh/width * Add missing param to _sw_barcode call * Make barcode() smarter, improvements and clean up * Use param font_size in sw_barcode() * Update docstrings * Update barcode examples and docs * Add --force_software option to CLI * Attempt to match the sw and hw barcode sizes * Better approximation to native font size * Fix docs build * Update tests at test_function_softbarcode * Fix exception * Move image dpi setting to writter_options * Fix _sw_barcode() docstring param * Fix wrong default param in docstring * improve linkage in documentation --------- Co-authored-by: Patrick Kanzler <4189642+patkan@users.noreply.github.com> Co-authored-by: Patrick Kanzler <dev@pkanzler.de>
2023-07-12 18:45:41 +00:00
:Last Reviewed: 2023-05-16
fix printing of CODE128 The control sequence {A or {B or {C can't be part of the qr code. For this the user has to supply this sequence.
2016-08-01 10:24:07 +00:00
New high level barcode method. Closes #245, #244. (#527) * Merge software and hardware barcodes to one method * Fix wrong sw barcode heigh/width * Add missing param to _sw_barcode call * Make barcode() smarter, improvements and clean up * Use param font_size in sw_barcode() * Update docstrings * Update barcode examples and docs * Add --force_software option to CLI * Attempt to match the sw and hw barcode sizes * Better approximation to native font size * Fix docs build * Update tests at test_function_softbarcode * Fix exception * Move image dpi setting to writter_options * Fix _sw_barcode() docstring param * Fix wrong default param in docstring * improve linkage in documentation --------- Co-authored-by: Patrick Kanzler <4189642+patkan@users.noreply.github.com> Co-authored-by: Patrick Kanzler <dev@pkanzler.de>
2023-07-12 18:45:41 +00:00
Many printers implement barcode printing natively.
This hardware renderered barcodes are fast but the supported formats are limited by the printer itself and different between models.
However, almost all printers support printing images, so barcode renderization can be performed externally by software and then sent to the printer as an image.
As a drawback, this operation is much slower and the user needs to know and choose the image implementation method supported by the printer's commandset.
fix printing of CODE128 The control sequence {A or {B or {C can't be part of the qr code. For this the user has to supply this sequence.
2016-08-01 10:24:07 +00:00
barcode-method
~~~~~~~~~~~~~~
New high level barcode method. Closes #245, #244. (#527) * Merge software and hardware barcodes to one method * Fix wrong sw barcode heigh/width * Add missing param to _sw_barcode call * Make barcode() smarter, improvements and clean up * Use param font_size in sw_barcode() * Update docstrings * Update barcode examples and docs * Add --force_software option to CLI * Attempt to match the sw and hw barcode sizes * Better approximation to native font size * Fix docs build * Update tests at test_function_softbarcode * Fix exception * Move image dpi setting to writter_options * Fix _sw_barcode() docstring param * Fix wrong default param in docstring * improve linkage in documentation --------- Co-authored-by: Patrick Kanzler <4189642+patkan@users.noreply.github.com> Co-authored-by: Patrick Kanzler <dev@pkanzler.de>
2023-07-12 18:45:41 +00:00
Since version 3.0, the ``barcode`` method unifies the previous ``barcode`` (hardware) and ``soft_barcode`` (software) methods.
It is able to choose automatically the best printer implementation for barcode printing based on the capabilities of the printer and the type of barcode desired.
To achieve this, it relies on the information contained in the escpos-printer-db profiles.
The chosen profile needs to match the capabilities of the printer as closely as possible.
fix printing of CODE128 The control sequence {A or {B or {C can't be part of the qr code. For this the user has to supply this sequence.
2016-08-01 10:24:07 +00:00
.. py:currentmodule:: escpos.escpos
.. automethod:: Escpos.barcode
:noindex:
CODE128
~~~~~~~
Code128 barcodes need a certain format.
For now the user has to make sure that the payload is correct.
For alphanumeric CODE128 you have to preface your payload with `{B`.
.. code-block:: Python
from escpos.printer import Dummy, Serial
p = Serial()
# print CODE128 012ABCDabcd
p.barcode("{B012ABCDabcd", "CODE128", function_type="B")
A very good description on CODE128 is also on `Wikipedia <https://en.wikipedia.org/wiki/Code_128>`_.