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SETUP move code to src

Browse Source 
This way we can ensure that the packaged code is tested.
See https://hynek.me/articles/testing-packaging/ or c62a78c015

+ DOC adapt doc to new structure and test doc with travis
This commit is contained in:
Patrick Kanzler
2016-06-20 16:41:46 +02:00
parent e8e91eba80
commit 87438f9efa
13 changed files with 32 additions and 7 deletions
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src/escpos/__init__.py Normal file
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__all__ = ["constants", "escpos", "exceptions", "printer"]

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src/escpos/cli.py Normal file
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#!/usr/bin/env python
""" CLI
This module acts as a command line interface for python-escpos. It mirrors
closely the available ESCPOS commands while adding a couple extra ones for convience.
It requires you to have a configuration file. See documentation for details.
"""
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
from __future__ import unicode_literals
import argparse
import sys
import six
from . import config
# Must be defined before it's used in DEMO_FUNCTIONS
def str_to_bool(string):
""" Used as a type in argparse so that we get back a proper
bool instead of always True
"""
return string.lower() in ('y', 'yes', '1', 'true')
# A list of functions that work better with a newline to be sent after them.
REQUIRES_NEWLINE = ('qr', 'barcode', 'text', 'block_text')
# Used in demo method
# Key: The name of escpos function and the argument passed on the CLI. Some
# manual translation is done in the case of barcodes_a -> barcode.
# Value: A list of dictionaries to pass to the escpos function as arguments.
DEMO_FUNCTIONS = {
'text': [
{'txt': 'Hello, World!\n', }
],
'qr': [
{'content': 'This tests a QR code'},
{'content': 'https://en.wikipedia.org/'}
],
'barcodes_a': [
{'bc': 'UPC-A', 'code': '13243546576'},
{'bc': 'UPC-E', 'code': '132435'},
{'bc': 'EAN13', 'code': '1324354657687'},
{'bc': 'EAN8', 'code': '1324354'},
{'bc': 'CODE39', 'code': 'TEST'},
{'bc': 'ITF', 'code': '55867492279103'},
{'bc': 'NW7', 'code': 'A00000000A'},
],
'barcodes_b': [
{'bc': 'UPC-A', 'code': '13243546576', 'function_type': 'B'},
{'bc': 'UPC-E', 'code': '132435', 'function_type': 'B'},
{'bc': 'EAN13', 'code': '1324354657687', 'function_type': 'B'},
{'bc': 'EAN8', 'code': '1324354', 'function_type': 'B'},
{'bc': 'CODE39', 'code': 'TEST', 'function_type': 'B'},
{'bc': 'ITF', 'code': '55867492279103', 'function_type': 'B'},
{'bc': 'NW7', 'code': 'A00000000A', 'function_type': 'B'},
{'bc': 'CODE93', 'code': 'A00000000A', 'function_type': 'B'},
{'bc': 'CODE93', 'code': '1324354657687', 'function_type': 'B'},
{'bc': 'CODE128A', 'code': 'TEST', 'function_type': 'B'},
{'bc': 'CODE128B', 'code': 'TEST', 'function_type': 'B'},
{'bc': 'CODE128C', 'code': 'TEST', 'function_type': 'B'},
{'bc': 'GS1-128', 'code': '00123456780000000001', 'function_type': 'B'},
{'bc': 'GS1 DataBar Omnidirectional', 'code': '0000000000000', 'function_type': 'B'},
{'bc': 'GS1 DataBar Truncated', 'code': '0000000000000', 'function_type': 'B'},
{'bc': 'GS1 DataBar Limited', 'code': '0000000000000', 'function_type': 'B'},
{'bc': 'GS1 DataBar Expanded', 'code': '00AAAAAAA', 'function_type': 'B'},
],
}
# Used to build the CLI
# A list of dictionaries. Each dict is a CLI argument.
# Keys:
# parser: A dict of args for command_parsers.add_parser
# defaults: A dict of args for subparser.set_defaults
# arguments: A list of dicts of args for subparser.add_argument
ESCPOS_COMMANDS = [
{
'parser': {
'name': 'qr',
'help': 'Print a QR code',
},
'defaults': {
'func': 'qr',
},
'arguments': [
{
'option_strings': ('--content',),
'help': 'Text to print as a qr code',
'required': True,
}
],
},
{
'parser': {
'name': 'barcode',
'help': 'Print a barcode',
},
'defaults': {
'func': 'barcode',
},
'arguments': [
{
'option_strings': ('--code',),
'help': 'Barcode data to print',
'required': True,
},
{
'option_strings': ('--bc',),
'help': 'Barcode format',
'required': True,
},
{
'option_strings': ('--height',),
'help': 'Barcode height in px',
'type': int,
},
{
'option_strings': ('--width',),
'help': 'Barcode width',
'type': int,
},
{
'option_strings': ('--pos',),
'help': 'Label position',
'choices': ['BELOW', 'ABOVE', 'BOTH', 'OFF'],
},
{
'option_strings': ('--font',),
'help': 'Label font',
'choices': ['A', 'B'],
},
{
'option_strings': ('--align_ct',),
'help': 'Align barcode center',
'type': str_to_bool,
},
{
'option_strings': ('--function_type',),
'help': 'ESCPOS function type',
'choices': ['A', 'B'],
},
],
},
{
'parser': {
'name': 'text',
'help': 'Print plain text',
},
'defaults': {
'func': 'text',
},
'arguments': [
{
'option_strings': ('--txt',),
'help': 'Plain text to print',
'required': True,
}
],
},
{
'parser': {
'name': 'block_text',
'help': 'Print wrapped text',
},
'defaults': {
'func': 'block_text',
},
'arguments': [
{
'option_strings': ('--txt',),
'help': 'block_text to print',
'required': True,
},
{
'option_strings': ('--columns',),
'help': 'Number of columns',
'type': int,
},
],
},
{
'parser': {
'name': 'cut',
'help': 'Cut the paper',
},
'defaults': {
'func': 'cut',
},
'arguments': [
{
'option_strings': ('--mode',),
'help': 'Type of cut',
'choices': ['FULL', 'PART'],
},
],
},
{
'parser': {
'name': 'cashdraw',
'help': 'Kick the cash drawer',
},
'defaults': {
'func': 'cashdraw',
},
'arguments': [
{
'option_strings': ('--pin',),
'help': 'Which PIN to kick',
'choices': [2, 5],
},
],
},
{
'parser': {
'name': 'image',
'help': 'Print an image',
},
'defaults': {
'func': 'image',
},
'arguments': [
{
'option_strings': ('--img_source',),
'help': 'Path to image',
'required': True,
},
{
'option_strings': ('--impl',),
'help': 'Implementation to use',
'choices': ['bitImageRaster', 'bitImageColumn', 'graphics'],
},
{
'option_strings': ('--high_density_horizontal',),
'help': 'Image density (horizontal)',
'type': str_to_bool,
},
{
'option_strings': ('--high_density_vertical',),
'help': 'Image density (vertical)',
'type': str_to_bool,
},
],
},
{
'parser': {
'name': 'fullimage',
'help': 'Print a fullimage',
},
'defaults': {
'func': 'fullimage',
},
'arguments': [
{
'option_strings': ('--img',),
'help': 'Path to img',
'required': True,
},
{
'option_strings': ('--max_height',),
'help': 'Max height of image in px',
'type': int,
},
{
'option_strings': ('--width',),
'help': 'Max width of image in px',
'type': int,
},
{
'option_strings': ('--histeq',),
'help': 'Equalize the histrogram',
'type': str_to_bool,
},
{
'option_strings': ('--bandsize',),
'help': 'Size of bands to divide into when printing',
'type': int,
},
],
},
{
'parser': {
'name': 'charcode',
'help': 'Set character code table',
},
'defaults': {
'func': 'charcode',
},
'arguments': [
{
'option_strings': ('--code',),
'help': 'Character code',
'required': True,
},
],
},
{
'parser': {
'name': 'set',
'help': 'Set text properties',
},
'defaults': {
'func': 'set',
},
'arguments': [
{
'option_strings': ('--align',),
'help': 'Horizontal alignment',
'choices': ['left', 'center', 'right'],
},
{
'option_strings': ('--font',),
'help': 'Font choice',
'choices': ['left', 'center', 'right'],
},
{
'option_strings': ('--text_type',),
'help': 'Text properties',
'choices': ['B', 'U', 'U2', 'BU', 'BU2', 'NORMAL'],
},
{
'option_strings': ('--width',),
'help': 'Width multiplier',
'type': int,
},
{
'option_strings': ('--height',),
'help': 'Height multiplier',
'type': int,
},
{
'option_strings': ('--density',),
'help': 'Print density',
'type': int,
},
{
'option_strings': ('--invert',),
'help': 'White on black printing',
'type': str_to_bool,
},
{
'option_strings': ('--smooth',),
'help': 'Text smoothing. Effective on >: 4x4 text',
'type': str_to_bool,
},
{
'option_strings': ('--flip',),
'help': 'Text smoothing. Effective on >: 4x4 text',
'type': str_to_bool,
},
],
},
{
'parser': {
'name': 'hw',
'help': 'Hardware operations',
},
'defaults': {
'func': 'hw',
},
'arguments': [
{
'option_strings': ('--hw',),
'help': 'Operation',
'choices': ['INIT', 'SELECT', 'RESET'],
'required': True,
},
],
},
{
'parser': {
'name': 'control',
'help': 'Control sequences',
},
'defaults': {
'func': 'control',
},
'arguments': [
{
'option_strings': ('--ctl',),
'help': 'Control sequence',
'choices': ['LF', 'FF', 'CR', 'HT', 'VT'],
'required': True,
},
{
'option_strings': ('--pos',),
'help': 'Horizontal tab position (1-4)',
'type': int,
},
],
},
{
'parser': {
'name': 'panel_buttons',
'help': 'Controls panel buttons',
},
'defaults': {
'func': 'panel_buttons',
},
'arguments': [
{
'option_strings': ('--enable',),
'help': 'Feed button enabled',
'type': str_to_bool,
'required': True,
},
],
},
{
'parser': {
'name': 'raw',
'help': 'Raw data',
},
'defaults': {
'func': '_raw',
},
'arguments': [
{
'option_strings': ('--msg',),
'help': 'Raw data to send',
'required': True,
},
],
},
]
def main():
"""
Handles loading of configuration and creating and processing of command
line arguments. Called when run from a CLI.
"""
parser = argparse.ArgumentParser(
description='CLI for python-escpos',
epilog='Printer configuration is defined in the python-escpos config'
'file. See documentation for details.',
)
parser.register('type', 'bool', str_to_bool)
# Allow config file location to be passed
parser.add_argument(
'-c', '--config',
help='Altnerate path to the configuration file',
)
# Everything interesting runs off of a subparser so we can use the format
# cli [subparser] -args
command_subparsers = parser.add_subparsers(
title='ESCPOS Command',
)
# Build the ESCPOS command arguments
for command in ESCPOS_COMMANDS:
parser_command = command_subparsers.add_parser(**command['parser'])
parser_command.set_defaults(**command['defaults'])
for argument in command['arguments']:
option_strings = argument.pop('option_strings')
parser_command.add_argument(*option_strings, **argument)
# Build any custom arguments
parser_command_demo = command_subparsers.add_parser('demo',
help='Demonstrates various functions')
parser_command_demo.set_defaults(func='demo')
demo_group = parser_command_demo.add_mutually_exclusive_group()
demo_group.add_argument(
'--barcodes-a',
help='Print demo barcodes for function type A',
action='store_true',
)
demo_group.add_argument(
'--barcodes-b',
help='Print demo barcodes for function type B',
action='store_true',
)
demo_group.add_argument(
'--qr',
help='Print some demo QR codes',
action='store_true',
)
demo_group.add_argument(
'--text',
help='Print some demo text',
action='store_true',
)
# Get only arguments actually passed
args_dict = vars(parser.parse_args())
if not args_dict:
parser.print_help()
sys.exit()
command_arguments = dict([k, v] for k, v in six.iteritems(args_dict) if v is not None)
# If there was a config path passed, grab it
config_path = command_arguments.pop('config', None)
# Load the configuration and defined printer
saved_config = config.Config()
saved_config.load(config_path)
printer = saved_config.printer()
if not printer:
raise Exception('No printers loaded from config')
target_command = command_arguments.pop('func')
if hasattr(printer, target_command):
# print command with args
getattr(printer, target_command)(**command_arguments)
if target_command in REQUIRES_NEWLINE:
printer.text("\n")
else:
command_arguments['printer'] = printer
globals()[target_command](**command_arguments)
def demo(printer, **kwargs):
"""
Prints specificed demos. Called when CLI is passed `demo`. This function
uses the DEMO_FUNCTIONS dictionary.
:param printer: A printer from escpos.printer
:param kwargs: A dict with a key for each function you want to test. It's
in this format since it usually comes from argparse.
"""
for demo_choice in kwargs.keys():
command = getattr(
printer,
demo_choice
.replace('barcodes_a', 'barcode')
.replace('barcodes_b', 'barcode')
)
for params in DEMO_FUNCTIONS[demo_choice]:
command(**params)
printer.cut()
if __name__ == '__main__':
main()

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src/escpos/config.py Normal file
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""" ESC/POS configuration manager.
This module contains the implentations of abstract base class :py:class:`Config`.
"""
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
from __future__ import unicode_literals
import os
import appdirs
import yaml
from . import printer
from . import exceptions
class Config(object):
""" Configuration handler class.
This class loads configuration from a default or specificed directory. It
can create your defined printer and return it to you.
"""
_app_name = 'python-escpos'
_config_file = 'config.yaml'
def __init__(self):
""" Initialize configuration.
Remember to add anything that needs to be reset between configurations
to self._reset_config
"""
self._has_loaded = False
self._printer = None
self._printer_name = None
self._printer_config = None
def _reset_config(self):
""" Clear the loaded configuration.
If we are loading a changed config, we don't want to have leftover
data.
"""
self._has_loaded = False
self._printer = None
self._printer_name = None
self._printer_config = None
def load(self, config_path=None):
""" Load and parse the configuration file using pyyaml
:param config_path: An optional file path, file handle, or byte string
for the configuration file.
"""
self._reset_config()
if not config_path:
config_path = os.path.join(
appdirs.user_config_dir(self._app_name),
self._config_file
)
try:
# First check if it's file like. If it is, pyyaml can load it.
# I'm checking type instead of catching exceptions to keep the
# exception handling simple
if hasattr(config_path, 'read'):
config = yaml.safe_load(config_path)
else:
# If it isn't, it's a path. We have to open it first, otherwise
# pyyaml will try to read it as yaml
with open(config_path, 'rb') as config_file:
config = yaml.safe_load(config_file)
except EnvironmentError:
raise exceptions.ConfigNotFoundError('Couldn\'t read config at {config_path}'.format(
config_path=str(config_path),
))
except yaml.YAMLError:
raise exceptions.ConfigSyntaxError('Error parsing YAML')
if 'printer' in config:
self._printer_config = config['printer']
self._printer_name = self._printer_config.pop('type').title()
if not self._printer_name or not hasattr(printer, self._printer_name):
raise exceptions.ConfigSyntaxError(
'Printer type "{printer_name}" is invalid'.format(
printer_name=self._printer_name,
)
)
self._has_loaded = True
def printer(self):
""" Returns a printer that was defined in the config, or throws an
exception.
This method loads the default config if one hasn't beeen already loaded.
"""
if not self._has_loaded:
self.load()
if not self._printer_name:
raise exceptions.ConfigSectionMissingError('printer')
if not self._printer:
# We could catch init errors and make them a ConfigSyntaxError,
# but I'll just let them pass
self._printer = getattr(printer, self._printer_name)(**self._printer_config)
return self._printer

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# -*- coding: utf-8 -*-
""" Set of ESC/POS Commands (Constants)
This module contains constants that are described in the esc/pos-documentation.
Since there is no definitive and unified specification for all esc/pos-like printers the constants could later be
moved to `capabilities` as in `escpos-php by @mike42 <https://github.com/mike42/escpos-php>`_.
:author: `Manuel F Martinez <manpaz@bashlinux.com>`_ and others
:organization: Bashlinux and `python-escpos <https://github.com/python-escpos>`_
:copyright: Copyright (c) 2012 Bashlinux
:license: GNU GPL v3
"""
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
from __future__ import unicode_literals
import six
# Control characters
# as labelled in http://www.novopos.ch/client/EPSON/TM-T20/TM-T20_eng_qr.pdf
NUL = b'\x00'
EOT = b'\x04'
ENQ = b'\x05'
DLE = b'\x10'
DC4 = b'\x14'
CAN = b'\x18'
ESC = b'\x1b'
FS = b'\x1c'
GS = b'\x1d'
# Feed control sequences
CTL_LF = b'\n' # Print and line feed
CTL_FF = b'\f' # Form feed
CTL_CR = b'\r' # Carriage return
CTL_HT = b'\t' # Horizontal tab
CTL_SET_HT = ESC + b'\x44' # Set horizontal tab positions
CTL_VT = b'\v' # Vertical tab
# Printer hardware
HW_INIT = ESC + b'@' # Clear data in buffer and reset modes
HW_SELECT = ESC + b'=\x01' # Printer select
HW_RESET = ESC + b'\x3f\x0a\x00' # Reset printer hardware
# (TODO: Where is this specified?)
# Cash Drawer (ESC p <pin> <on time: 2*ms> <off time: 2*ms>)
_CASH_DRAWER = lambda m, t1='', t2='': ESC + b'p' + m + six.int2byte(t1) + six.int2byte(t2)
CD_KICK_2 = _CASH_DRAWER(b'\x00', 50, 50) # Sends a pulse to pin 2 []
CD_KICK_5 = _CASH_DRAWER(b'\x01', 50, 50) # Sends a pulse to pin 5 []
# Paper Cutter
_CUT_PAPER = lambda m: GS + b'V' + m
PAPER_FULL_CUT = _CUT_PAPER(b'\x00') # Full cut paper
PAPER_PART_CUT = _CUT_PAPER(b'\x01') # Partial cut paper
# Panel buttons (e.g. the FEED button)
_PANEL_BUTTON = lambda n: ESC + b'c5' + six.int2byte(n)
PANEL_BUTTON_ON = _PANEL_BUTTON(0) # enable all panel buttons
PANEL_BUTTON_OFF = _PANEL_BUTTON(1) # disable all panel buttons
# Text format
# TODO: Acquire the "ESC/POS Application Programming Guide for Paper Roll
# Printers" and tidy up this stuff too.
TXT_FLIP_ON = ESC + b'\x7b\x01'
TXT_FLIP_OFF = ESC + b'\x7b\x00'
TXT_SMOOTH_ON = GS + b'\x62\x01'
TXT_SMOOTH_OFF = GS + b'\x62\x00'
TXT_SIZE = GS + b'!'
TXT_WIDTH = {1: 0x00,
2: 0x10,
3: 0x20,
4: 0x30,
5: 0x40,
6: 0x50,
7: 0x60,
8: 0x70}
TXT_HEIGHT = {1: 0x00,
2: 0x01,
3: 0x02,
4: 0x03,
5: 0x04,
6: 0x05,
7: 0x06,
8: 0x07}
TXT_NORMAL = ESC + b'!\x00' # Normal text
TXT_2HEIGHT = ESC + b'!\x10' # Double height text
TXT_2WIDTH = ESC + b'!\x20' # Double width text
TXT_4SQUARE = ESC + b'!\x30' # Quad area text
TXT_UNDERL_OFF = ESC + b'\x2d\x00' # Underline font OFF
TXT_UNDERL_ON = ESC + b'\x2d\x01' # Underline font 1-dot ON
TXT_UNDERL2_ON = ESC + b'\x2d\x02' # Underline font 2-dot ON
TXT_BOLD_OFF = ESC + b'\x45\x00' # Bold font OFF
TXT_BOLD_ON = ESC + b'\x45\x01' # Bold font ON
TXT_FONT_A = ESC + b'\x4d\x00' # Font type A
TXT_FONT_B = ESC + b'\x4d\x01' # Font type B
TXT_ALIGN_LT = ESC + b'\x61\x00' # Left justification
TXT_ALIGN_CT = ESC + b'\x61\x01' # Centering
TXT_ALIGN_RT = ESC + b'\x61\x02' # Right justification
TXT_INVERT_ON = GS + b'\x42\x01' # Inverse Printing ON
TXT_INVERT_OFF = GS + b'\x42\x00' # Inverse Printing OFF
# Char code table
CHARCODE_PC437 = ESC + b'\x74\x00' # USA: Standard Europe
CHARCODE_JIS = ESC + b'\x74\x01' # Japanese Katakana
CHARCODE_PC850 = ESC + b'\x74\x02' # Multilingual
CHARCODE_PC860 = ESC + b'\x74\x03' # Portuguese
CHARCODE_PC863 = ESC + b'\x74\x04' # Canadian-French
CHARCODE_PC865 = ESC + b'\x74\x05' # Nordic
CHARCODE_WEU = ESC + b'\x74\x06' # Simplified Kanji, Hirakana
CHARCODE_GREEK = ESC + b'\x74\x07' # Simplified Kanji
CHARCODE_HEBREW = ESC + b'\x74\x08' # Simplified Kanji
CHARCODE_PC1252 = ESC + b'\x74\x11' # Western European Windows Code Set
CHARCODE_PC866 = ESC + b'\x74\x12' # Cirillic #2
CHARCODE_PC852 = ESC + b'\x74\x13' # Latin 2
CHARCODE_PC858 = ESC + b'\x74\x14' # Euro
CHARCODE_THAI42 = ESC + b'\x74\x15' # Thai character code 42
CHARCODE_THAI11 = ESC + b'\x74\x16' # Thai character code 11
CHARCODE_THAI13 = ESC + b'\x74\x17' # Thai character code 13
CHARCODE_THAI14 = ESC + b'\x74\x18' # Thai character code 14
CHARCODE_THAI16 = ESC + b'\x74\x19' # Thai character code 16
CHARCODE_THAI17 = ESC + b'\x74\x1a' # Thai character code 17
CHARCODE_THAI18 = ESC + b'\x74\x1b' # Thai character code 18
# Barcode format
_SET_BARCODE_TXT_POS = lambda n: GS + b'H' + n
BARCODE_TXT_OFF = _SET_BARCODE_TXT_POS(b'\x00') # HRI barcode chars OFF
BARCODE_TXT_ABV = _SET_BARCODE_TXT_POS(b'\x01') # HRI barcode chars above
BARCODE_TXT_BLW = _SET_BARCODE_TXT_POS(b'\x02') # HRI barcode chars below
BARCODE_TXT_BTH = _SET_BARCODE_TXT_POS(b'\x03') # HRI both above and below
_SET_HRI_FONT = lambda n: GS + b'f' + n
BARCODE_FONT_A = _SET_HRI_FONT(b'\x00') # Font type A for HRI barcode chars
BARCODE_FONT_B = _SET_HRI_FONT(b'\x01') # Font type B for HRI barcode chars
BARCODE_HEIGHT = GS + b'h' # Barcode Height [1-255]
BARCODE_WIDTH = GS + b'w' # Barcode Width [2-6]
# NOTE: This isn't actually an ESC/POS command. It's the common prefix to the
# two "print bar code" commands:
# - Type A: "GS k <type as integer> <data> NUL"
# - TYPE B: "GS k <type as letter> <data length> <data>"
# The latter command supports more barcode types
_SET_BARCODE_TYPE = lambda m: GS + b'k' + six.int2byte(m)
# Barcodes for printing function type A
BARCODE_TYPE_A = {
'UPC-A': _SET_BARCODE_TYPE(0),
'UPC-E': _SET_BARCODE_TYPE(1),
'EAN13': _SET_BARCODE_TYPE(2),
'EAN8': _SET_BARCODE_TYPE(3),
'CODE39': _SET_BARCODE_TYPE(4),
'ITF': _SET_BARCODE_TYPE(5),
'NW7': _SET_BARCODE_TYPE(6),
'CODABAR': _SET_BARCODE_TYPE(6), # Same as NW7
}
# Barcodes for printing function type B
# The first 8 are the same barcodes as type A
BARCODE_TYPE_B = {
'UPC-A': _SET_BARCODE_TYPE(65),
'UPC-E': _SET_BARCODE_TYPE(66),
'EAN13': _SET_BARCODE_TYPE(67),
'EAN8': _SET_BARCODE_TYPE(68),
'CODE39': _SET_BARCODE_TYPE(69),
'ITF': _SET_BARCODE_TYPE(70),
'NW7': _SET_BARCODE_TYPE(71),
'CODABAR': _SET_BARCODE_TYPE(71), # Same as NW7
'CODE93': _SET_BARCODE_TYPE(72),
# These are all the same barcode, but using different charcter sets
'CODE128A': _SET_BARCODE_TYPE(73) + b'{A', # CODE128 character set A
'CODE128B': _SET_BARCODE_TYPE(73) + b'{B', # CODE128 character set B
'CODE128C': _SET_BARCODE_TYPE(73) + b'{C', # CODE128 character set C
'GS1-128': _SET_BARCODE_TYPE(74),
'GS1 DATABAR OMNIDIRECTIONAL': _SET_BARCODE_TYPE(75),
'GS1 DATABAR TRUNCATED': _SET_BARCODE_TYPE(76),
'GS1 DATABAR LIMITED': _SET_BARCODE_TYPE(77),
'GS1 DATABAR EXPANDED': _SET_BARCODE_TYPE(78),
}
BARCODE_TYPES = {
'A': BARCODE_TYPE_A,
'B': BARCODE_TYPE_B,
}
# QRCode error correction levels
QR_ECLEVEL_L = 0
QR_ECLEVEL_M = 1
QR_ECLEVEL_Q = 2
QR_ECLEVEL_H = 3
# QRcode models
QR_MODEL_1 = 1
QR_MODEL_2 = 2
QR_MICRO = 3
# Image format
# NOTE: _PRINT_RASTER_IMG is the obsolete ESC/POS "print raster bit image"
# command. The constants include a fragment of the data's header.
_PRINT_RASTER_IMG = lambda data: GS + b'v0' + data
S_RASTER_N = _PRINT_RASTER_IMG(b'\x00') # Set raster image normal size
S_RASTER_2W = _PRINT_RASTER_IMG(b'\x01') # Set raster image double width
S_RASTER_2H = _PRINT_RASTER_IMG(b'\x02') # Set raster image double height
S_RASTER_Q = _PRINT_RASTER_IMG(b'\x03') # Set raster image quadruple
# Printing Density
PD_N50 = GS + b'\x7c\x00' # Printing Density -50%
PD_N37 = GS + b'\x7c\x01' # Printing Density -37.5%
PD_N25 = GS + b'\x7c\x02' # Printing Density -25%
PD_N12 = GS + b'\x7c\x03' # Printing Density -12.5%
PD_0 = GS + b'\x7c\x04' # Printing Density 0%
PD_P50 = GS + b'\x7c\x08' # Printing Density +50%
PD_P37 = GS + b'\x7c\x07' # Printing Density +37.5%
PD_P25 = GS + b'\x7c\x06' # Printing Density +25%
PD_P12 = GS + b'\x7c\x05' # Printing Density +12.5%

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#!/usr/bin/python
# -*- coding: utf-8 -*-
""" Main class
This module contains the abstract base class :py:class:`Escpos`.
:author: `Manuel F Martinez <manpaz@bashlinux.com>`_ and others
:organization: Bashlinux and `python-escpos <https://github.com/python-escpos>`_
:copyright: Copyright (c) 2012 Bashlinux
:license: GNU GPL v3
"""
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
from __future__ import unicode_literals
import qrcode
import textwrap
from .constants import *
from .exceptions import *
from abc import ABCMeta, abstractmethod # abstract base class support
from escpos.image import EscposImage
@six.add_metaclass(ABCMeta)
class Escpos(object):
""" ESC/POS Printer object
This class is the abstract base class for an esc/pos-printer. The printer implementations are children of this
class.
"""
device = None
codepage = None
def __init__(self, columns=32):
""" Initialize ESCPOS Printer
:param columns: Text columns used by the printer. Defaults to 32."""
self.columns = columns
def __del__(self):
""" call self.close upon deletion """
self.close()
@abstractmethod
def _raw(self, msg):
""" Sends raw data to the printer
This function has to be individually implemented by the implementations.
:param msg: message string to be sent to the printer
:type msg: bytes
"""
pass
def image(self, img_source, high_density_vertical=True, high_density_horizontal=True, impl="bitImageRaster"):
""" Print an image
You can select whether the printer should print in high density or not. The default value is high density.
When printing in low density, the image will be stretched.
Esc/Pos supplies several commands for printing. This function supports three of them. Please try to vary the
implementations if you have any problems. For example the printer `IT80-002` will have trouble aligning
images that are not printed in Column-mode.
The available printing implementations are:
* `bitImageRaster`: prints with the `GS v 0`-command
* `graphics`: prints with the `GS ( L`-command
* `bitImageColumn`: prints with the `ESC *`-command
:param img_source: PIL image or filename to load: `jpg`, `gif`, `png` or `bmp`
:param high_density_vertical: print in high density in vertical direction *default:* True
:param high_density_horizontal: print in high density in horizontal direction *default:* True
:param impl: choose image printing mode between `bitImageRaster`, `graphics` or `bitImageColumn`
"""
im = EscposImage(img_source)
if impl == "bitImageRaster":
# GS v 0, raster format bit image
density_byte = (0 if high_density_horizontal else 1) + (0 if high_density_vertical else 2)
header = GS + b"v0" + six.int2byte(density_byte) + self._int_low_high(im.width_bytes, 2) + self._int_low_high(im.height, 2)
self._raw(header + im.to_raster_format())
if impl == "graphics":
# GS ( L raster format graphics
img_header = self._int_low_high(im.width, 2) + self._int_low_high(im.height, 2)
tone = b'0'
colors = b'1'
ym = six.int2byte(1 if high_density_vertical else 2)
xm = six.int2byte(1 if high_density_horizontal else 2)
header = tone + xm + ym + colors + img_header
raster_data = im.to_raster_format()
self._image_send_graphics_data(b'0', b'p', header + raster_data)
self._image_send_graphics_data(b'0', b'2', b'')
if impl == "bitImageColumn":
# ESC *, column format bit image
density_byte = (1 if high_density_horizontal else 0) + (32 if high_density_vertical else 0)
header = ESC + b"*" + six.int2byte(density_byte) + self._int_low_high(im.width, 2)
outp = [ESC + b"3" + six.int2byte(16)] # Adjust line-feed size
for blob in im.to_column_format(high_density_vertical):
outp.append(header + blob + b"\n")
outp.append(ESC + b"2") # Reset line-feed size
self._raw(b''.join(outp))
def _image_send_graphics_data(self, m, fn, data):
"""
Wrapper for GS ( L, to calculate and send correct data length.
:param m: Modifier//variant for function. Usually '0'
:param fn: Function number to use, as byte
:param data: Data to send
"""
header = self._int_low_high(len(data) + 2, 2)
self._raw(GS + b'(L' + header + m + fn + data)
def qr(self, content, ec=QR_ECLEVEL_L, size=3, model=QR_MODEL_2, native=False):
""" Print QR Code for the provided string
:param content: The content of the code. Numeric data will be more efficiently compacted.
:param ec: Error-correction level to use. One of QR_ECLEVEL_L (default), QR_ECLEVEL_M, QR_ECLEVEL_Q or
QR_ECLEVEL_H.
Higher error correction results in a less compact code.
:param size: Pixel size to use. Must be 1-16 (default 3)
:param model: QR code model to use. Must be one of QR_MODEL_1, QR_MODEL_2 (default) or QR_MICRO (not supported
by all printers).
:param native: True to render the code on the printer, False to render the code as an image and send it to the
printer (Default)
"""
# Basic validation
if ec not in [QR_ECLEVEL_L, QR_ECLEVEL_M, QR_ECLEVEL_H, QR_ECLEVEL_Q]:
raise ValueError("Invalid error correction level")
if not 1 <= size <= 16:
raise ValueError("Invalid block size (must be 1-16)")
if model not in [QR_MODEL_1, QR_MODEL_2, QR_MICRO]:
raise ValueError("Invalid QR model (must be one of QR_MODEL_1, QR_MODEL_2, QR_MICRO)")
if content == "":
# Handle edge case by printing nothing.
return
if not native:
# Map ESC/POS error correction levels to python 'qrcode' library constant and render to an image
if model != QR_MODEL_2:
raise ValueError("Invalid QR model for qrlib rendering (must be QR_MODEL_2)")
python_qr_ec = {
QR_ECLEVEL_H: qrcode.constants.ERROR_CORRECT_H,
QR_ECLEVEL_L: qrcode.constants.ERROR_CORRECT_L,
QR_ECLEVEL_M: qrcode.constants.ERROR_CORRECT_M,
QR_ECLEVEL_Q: qrcode.constants.ERROR_CORRECT_Q
}
qr_code = qrcode.QRCode(version=None, box_size=size, border=1, error_correction=python_qr_ec[ec])
qr_code.add_data(content)
qr_code.make(fit=True)
qr_img = qr_code.make_image()
im = qr_img._img.convert("RGB")
# Convert the RGB image in printable image
self.image(im)
return
# Native 2D code printing
cn = b'1' # Code type for QR code
# Select model: 1, 2 or micro.
self._send_2d_code_data(six.int2byte(65), cn, six.int2byte(48 + model) + six.int2byte(0))
# Set dot size.
self._send_2d_code_data(six.int2byte(67), cn, six.int2byte(size))
# Set error correction level: L, M, Q, or H
self._send_2d_code_data(six.int2byte(69), cn, six.int2byte(48 + ec))
# Send content & print
self._send_2d_code_data(six.int2byte(80), cn, content.encode('utf-8'), b'0')
self._send_2d_code_data(six.int2byte(81), cn, b'', b'0')
def _send_2d_code_data(self, fn, cn, data, m=b''):
""" Wrapper for GS ( k, to calculate and send correct data length.
:param fn: Function to use.
:param cn: Output code type. Affects available data.
:param data: Data to send.
:param m: Modifier/variant for function. Often '0' where used.
"""
if len(m) > 1 or len(cn) != 1 or len(fn) != 1:
raise ValueError("cn and fn must be one byte each.")
header = self._int_low_high(len(data) + len(m) + 2, 2)
self._raw(GS + b'(k' + header + cn + fn + m + data)
@staticmethod
def _int_low_high(inp_number, out_bytes):
""" Generate multiple bytes for a number: In lower and higher parts, or more parts as needed.
:param inp_number: Input number
:param out_bytes: The number of bytes to output (1 - 4).
"""
max_input = (256 << (out_bytes * 8) - 1)
if not 1 <= out_bytes <= 4:
raise ValueError("Can only output 1-4 byes")
if not 0 <= inp_number <= max_input:
raise ValueError("Number too large. Can only output up to {0} in {1} byes".format(max_input, out_bytes))
outp = b''
for _ in range(0, out_bytes):
outp += six.int2byte(inp_number % 256)
inp_number //= 256
return outp
def charcode(self, code):
""" Set Character Code Table
Sends the control sequence from :py:mod:`escpos.constants` to the printer
with :py:meth:`escpos.printer.'implementation'._raw()`.
:param code: Name of CharCode
:raises: :py:exc:`~escpos.exceptions.CharCodeError`
"""
# TODO improve this (rather unhandy code)
# TODO check the codepages
if code.upper() == "USA":
self._raw(CHARCODE_PC437)
self.codepage = 'cp437'
elif code.upper() == "JIS":
self._raw(CHARCODE_JIS)
self.codepage = 'cp932'
elif code.upper() == "MULTILINGUAL":
self._raw(CHARCODE_PC850)
self.codepage = 'cp850'
elif code.upper() == "PORTUGUESE":
self._raw(CHARCODE_PC860)
self.codepage = 'cp860'
elif code.upper() == "CA_FRENCH":
self._raw(CHARCODE_PC863)
self.codepage = 'cp863'
elif code.upper() == "NORDIC":
self._raw(CHARCODE_PC865)
self.codepage = 'cp865'
elif code.upper() == "WEST_EUROPE":
self._raw(CHARCODE_WEU)
self.codepage = 'latin_1'
elif code.upper() == "GREEK":
self._raw(CHARCODE_GREEK)
self.codepage = 'cp737'
elif code.upper() == "HEBREW":
self._raw(CHARCODE_HEBREW)
self.codepage = 'cp862'
# elif code.upper() == "LATVIAN": # this is not listed in the constants
# self._raw(CHARCODE_PC755)
# self.codepage = 'cp'
elif code.upper() == "WPC1252":
self._raw(CHARCODE_PC1252)
self.codepage = 'cp1252'
elif code.upper() == "CIRILLIC2":
self._raw(CHARCODE_PC866)
self.codepage = 'cp866'
elif code.upper() == "LATIN2":
self._raw(CHARCODE_PC852)
self.codepage = 'cp852'
elif code.upper() == "EURO":
self._raw(CHARCODE_PC858)
self.codepage = 'cp858'
elif code.upper() == "THAI42":
self._raw(CHARCODE_THAI42)
self.codepage = 'cp874'
elif code.upper() == "THAI11":
self._raw(CHARCODE_THAI11)
self.codepage = 'cp874'
elif code.upper() == "THAI13":
self._raw(CHARCODE_THAI13)
self.codepage = 'cp874'
elif code.upper() == "THAI14":
self._raw(CHARCODE_THAI14)
self.codepage = 'cp874'
elif code.upper() == "THAI16":
self._raw(CHARCODE_THAI16)
self.codepage = 'cp874'
elif code.upper() == "THAI17":
self._raw(CHARCODE_THAI17)
self.codepage = 'cp874'
elif code.upper() == "THAI18":
self._raw(CHARCODE_THAI18)
self.codepage = 'cp874'
else:
raise CharCodeError()
def barcode(self, code, bc, height=64, width=3, pos="BELOW", font="A", align_ct=True, function_type="A"):
""" Print Barcode
This method allows to print barcodes. The rendering of the barcode is done by the printer and therefore has to
be supported by the unit. Currently you have to check manually whether your barcode text is correct. Uncorrect
barcodes may lead to unexpected printer behaviour. There are two forms of the barcode function. Type A is
default but has fewer barcodes, while type B has some more to choose from.
.. todo:: Add a method to check barcode codes. Alternatively or as an addition write explanations about each
barcode-type. Research whether the check digits can be computed autmatically.
Use the parameters `height` and `width` for adjusting of the barcode size. Please take notice that the barcode
will not be printed if it is outside of the printable area. (Which should be impossible with this method, so
this information is probably more useful for debugging purposes.)
.. todo:: On TM-T88II width from 1 to 6 is accepted. Try to acquire command reference and correct the code.
.. todo:: Supplying pos does not have an effect for every barcode type. Check and document for which types this
is true.
If you do not want to center the barcode you can call the method with `align_ct=False`, which will disable
automatic centering. Please note that when you use center alignment, then the alignment of text will be changed
automatically to centered. You have to manually restore the alignment if necessary.
.. todo:: If further barcode-types are needed they could be rendered transparently as an image. (This could also
be of help if the printer does not support types that others do.)
:param code: alphanumeric data to be printed as bar code
:param bc: barcode format, possible values are for type A are:
* UPC-A
* UPC-E
* EAN13
* EAN8
* CODE39
* ITF
* NW7
Possible values for type B:
* All types from function type A
* CODE93
* CODE128
* GS1-128
* GS1 DataBar Omnidirectional
* GS1 DataBar Truncated
* GS1 DataBar Limited
* GS1 DataBar Expanded
If none is specified, the method raises :py:exc:`~escpos.exceptions.BarcodeTypeError`.
:param height: barcode height, has to be between 1 and 255
*default*: 64
:type height: int
:param width: barcode width, has to be between 2 and 6
*default*: 3
:type width: int
:param pos: where to place the text relative to the barcode, *default*: BELOW
* ABOVE
* BELOW
* BOTH
* OFF
:param font: select font (see ESC/POS-documentation, the device often has two fonts), *default*: A
* A
* B
:param align_ct: If this parameter is True the barcode will be centered. Otherwise no alignment command will be
issued.
:type align_ct: bool
:param function_type: Choose between ESCPOS function type A or B, depending on printer support and desired
barcode.
*default*: A
:raises: :py:exc:`~escpos.exceptions.BarcodeSizeError`,
:py:exc:`~escpos.exceptions.BarcodeTypeError`,
:py:exc:`~escpos.exceptions.BarcodeCodeError`
"""
# Align Bar Code()
if align_ct:
self._raw(TXT_ALIGN_CT)
# Height
if 1 <= height <= 255:
self._raw(BARCODE_HEIGHT + six.int2byte(height))
else:
raise BarcodeSizeError("height = {height}".format(height=height))
# Width
if 2 <= width <= 6:
self._raw(BARCODE_WIDTH + six.int2byte(width))
else:
raise BarcodeSizeError("width = {width}".format(width=width))
# Font
if font.upper() == "B":
self._raw(BARCODE_FONT_B)
else: # DEFAULT FONT: A
self._raw(BARCODE_FONT_A)
# Position
if pos.upper() == "OFF":
self._raw(BARCODE_TXT_OFF)
elif pos.upper() == "BOTH":
self._raw(BARCODE_TXT_BTH)
elif pos.upper() == "ABOVE":
self._raw(BARCODE_TXT_ABV)
else: # DEFAULT POSITION: BELOW
self._raw(BARCODE_TXT_BLW)
bc_types = BARCODE_TYPES[function_type.upper()]
if bc.upper() not in bc_types.keys():
# TODO: Raise a better error, or fix the message of this error type
raise BarcodeTypeError("Barcode type {bc} not valid for barcode function type {function_type}".format(
bc=bc,
function_type=function_type,
))
self._raw(bc_types[bc.upper()])
if function_type.upper() == "B":
self._raw(six.int2byte(len(code)))
# Print Code
if code:
self._raw(code.encode())
else:
raise BarcodeCodeError()
if function_type.upper() == "A":
self._raw(NUL)
def text(self, txt):
""" Print alpha-numeric text
The text has to be encoded in the currently selected codepage.
The input text has to be encoded in unicode.
:param txt: text to be printed
:raises: :py:exc:`~escpos.exceptions.TextError`
"""
if txt:
if self.codepage:
self._raw(txt.encode(self.codepage))
else:
self._raw(txt.encode())
else:
# TODO: why is it problematic to print an empty string?
raise TextError()
def block_text(self, txt, columns=None):
""" Text is printed wrapped to specified columns
Text has to be encoded in unicode.
:param txt: text to be printed
:param columns: amount of columns
:return: None
"""
col_count = self.columns if columns is None else columns
self.text(textwrap.fill(txt, col_count))
def set(self, align='left', font='a', text_type='normal', width=1, height=1, density=9, invert=False, smooth=False,
flip=False):
""" Set text properties by sending them to the printer
:param align: horizontal position for text, possible values are:
* CENTER
* LEFT
* RIGHT
*default*: LEFT
:param font: font type, possible values are A or B, *default*: A
:param text_type: text type, possible values are:
* B for bold
* U for underlined
* U2 for underlined, version 2
* BU for bold and underlined
* BU2 for bold and underlined, version 2
* NORMAL for normal text
*default*: NORMAL
:param width: text width multiplier, decimal range 1-8, *default*: 1
:param height: text height multiplier, decimal range 1-8, *default*: 1
:param density: print density, value from 0-8, if something else is supplied the density remains unchanged
:param invert: True enables white on black printing, *default*: False
:param smooth: True enables text smoothing. Effective on 4x4 size text and larger, *default*: False
:param flip: True enables upside-down printing, *default*: False
:type invert: bool
"""
# Width
if height == 2 and width == 2:
self._raw(TXT_NORMAL)
self._raw(TXT_4SQUARE)
elif height == 2 and width == 1:
self._raw(TXT_NORMAL)
self._raw(TXT_2HEIGHT)
elif width == 2 and height == 1:
self._raw(TXT_NORMAL)
self._raw(TXT_2WIDTH)
elif width == 1 and height == 1:
self._raw(TXT_NORMAL)
elif 1 <= width <= 8 and 1 <= height <= 8 and isinstance(width, int) and isinstance(height, int):
self._raw(TXT_SIZE + six.int2byte(TXT_WIDTH[width] + TXT_HEIGHT[height]))
else:
raise SetVariableError()
# Upside down
if flip:
self._raw(TXT_FLIP_ON)
else:
self._raw(TXT_FLIP_OFF)
# Smoothing
if smooth:
self._raw(TXT_SMOOTH_ON)
else:
self._raw(TXT_SMOOTH_OFF)
# Type
if text_type.upper() == "B":
self._raw(TXT_BOLD_ON)
self._raw(TXT_UNDERL_OFF)
elif text_type.upper() == "U":
self._raw(TXT_BOLD_OFF)
self._raw(TXT_UNDERL_ON)
elif text_type.upper() == "U2":
self._raw(TXT_BOLD_OFF)
self._raw(TXT_UNDERL2_ON)
elif text_type.upper() == "BU":
self._raw(TXT_BOLD_ON)
self._raw(TXT_UNDERL_ON)
elif text_type.upper() == "BU2":
self._raw(TXT_BOLD_ON)
self._raw(TXT_UNDERL2_ON)
elif text_type.upper() == "NORMAL":
self._raw(TXT_BOLD_OFF)
self._raw(TXT_UNDERL_OFF)
# Font
if font.upper() == "B":
self._raw(TXT_FONT_B)
else: # DEFAULT FONT: A
self._raw(TXT_FONT_A)
# Align
if align.upper() == "CENTER":
self._raw(TXT_ALIGN_CT)
elif align.upper() == "RIGHT":
self._raw(TXT_ALIGN_RT)
elif align.upper() == "LEFT":
self._raw(TXT_ALIGN_LT)
# Density
if density == 0:
self._raw(PD_N50)
elif density == 1:
self._raw(PD_N37)
elif density == 2:
self._raw(PD_N25)
elif density == 3:
self._raw(PD_N12)
elif density == 4:
self._raw(PD_0)
elif density == 5:
self._raw(PD_P12)
elif density == 6:
self._raw(PD_P25)
elif density == 7:
self._raw(PD_P37)
elif density == 8:
self._raw(PD_P50)
else: # DEFAULT: DOES NOTHING
pass
# Invert Printing
if invert:
self._raw(TXT_INVERT_ON)
else:
self._raw(TXT_INVERT_OFF)
def cut(self, mode=''):
""" Cut paper.
Without any arguments the paper will be cut completely. With 'mode=PART' a partial cut will
be attempted. Note however, that not all models can do a partial cut. See the documentation of
your printer for details.
.. todo:: Check this function on TM-T88II.
:param mode: set to 'PART' for a partial cut
"""
# Fix the size between last line and cut
# TODO: handle this with a line feed
self._raw(b"\n\n\n\n\n\n")
if mode.upper() == "PART":
self._raw(PAPER_PART_CUT)
else: # DEFAULT MODE: FULL CUT
self._raw(PAPER_FULL_CUT)
def cashdraw(self, pin):
""" Send pulse to kick the cash drawer
Kick cash drawer on pin 2 or pin 5 according to parameter.
:param pin: pin number, 2 or 5
:raises: :py:exc:`~escpos.exceptions.CashDrawerError`
"""
if pin == 2:
self._raw(CD_KICK_2)
elif pin == 5:
self._raw(CD_KICK_5)
else:
raise CashDrawerError()
def hw(self, hw):
""" Hardware operations
:param hw: hardware action, may be:
* INIT
* SELECT
* RESET
"""
if hw.upper() == "INIT":
self._raw(HW_INIT)
elif hw.upper() == "SELECT":
self._raw(HW_SELECT)
elif hw.upper() == "RESET":
self._raw(HW_RESET)
else: # DEFAULT: DOES NOTHING
pass
def control(self, ctl, pos=4):
""" Feed control sequences
:param ctl: string for the following control sequences:
* LF *for Line Feed*
* FF *for Form Feed*
* CR *for Carriage Return*
* HT *for Horizontal Tab*
* VT *for Vertical Tab*
:param pos: integer between 1 and 16, controls the horizontal tab position
:raises: :py:exc:`~escpos.exceptions.TabPosError`
"""
# Set tab positions
if not (1 <= pos <= 16):
raise TabPosError()
else:
self._raw(CTL_SET_HT + six.int2byte(pos))
# Set position
if ctl.upper() == "LF":
self._raw(CTL_LF)
elif ctl.upper() == "FF":
self._raw(CTL_FF)
elif ctl.upper() == "CR":
self._raw(CTL_CR)
elif ctl.upper() == "HT":
self._raw(CTL_HT)
elif ctl.upper() == "VT":
self._raw(CTL_VT)
def panel_buttons(self, enable=True):
""" Controls the panel buttons on the printer (e.g. FEED)
When enable is set to False the panel buttons on the printer will be disabled. Calling the method with
enable=True or without argument will enable the panel buttons.
If panel buttons are enabled, the function of the panel button, such as feeding, will be executed upon pressing
the button. If the panel buttons are disabled, pressing them will not have any effect.
This command is effective until the printer is initialized, reset or power-cycled. The default is enabled panel
buttons.
Some panel buttons will always work, especially when printer is opened. See for more information the manual
of your printer and the escpos-command-reference.
:param enable: controls the panel buttons
:rtype: None
"""
if enable:
self._raw(PANEL_BUTTON_ON)
else:
self._raw(PANEL_BUTTON_OFF)
class EscposIO(object):
"""ESC/POS Printer IO object
Allows the class to be used together with the `with`-statement. You have to define a printer instance
and assign it to the EsposIO-class.
This example explains the usage:
.. code-block:: Python
with EscposIO(printer.Serial('/dev/ttyUSB0')) as p:
p.set(font='a', height=2, align='center', text_type='bold')
p.printer.set(align='left')
p.printer.image('logo.gif')
p.writelines('Big line\\n', font='b')
p.writelines('Привет')
p.writelines('BIG TEXT', width=2)
After the `with`-statement the printer automatically cuts the paper if `autocut` is `True`.
"""
def __init__(self, printer, autocut=True, autoclose=True, **kwargs):
"""
:param printer: An EscPos-printer object
:type printer: escpos.Escpos
:param autocut: If True, paper is automatically cut after the `with`-statement *default*: True
:param kwargs: These arguments will be passed to :py:meth:`escpos.Escpos.set()`
"""
self.printer = printer
self.params = kwargs
self.autocut = autocut
self.autoclose = autoclose
def set(self, **kwargs):
""" Set the printer-parameters
Controls which parameters will be passed to :py:meth:`Escpos.set() <escpos.escpos.Escpos.set()>`.
For more information on the parameters see the :py:meth:`set() <escpos.escpos.Escpos.set()>`-methods
documentation. These parameters can also be passed with this class' constructor or the
:py:meth:`~escpos.escpos.EscposIO.writelines()`-method.
:param kwargs: keyword-parameters that will be passed to :py:meth:`Escpos.set() <escpos.escpos.Escpos.set()>`
"""
self.params.update(kwargs)
def writelines(self, text, **kwargs):
params = dict(self.params)
params.update(kwargs)
if isinstance(text, six.text_type):
lines = text.split('\n')
elif isinstance(text, list) or isinstance(text, tuple):
lines = text
else:
lines = ["{0}".format(text), ]
# TODO check unicode handling
# TODO flush? or on print? (this should prob rather be handled by the _raw-method)
for line in lines:
self.printer.set(**params)
if isinstance(text, six.text_type):
self.printer.text(u"{0}\n".format(line))
else:
self.printer.text("{0}\n".format(line))
def close(self):
""" called upon closing the `with`-statement
"""
self.printer.close()
def __enter__(self, **kwargs):
return self
def __exit__(self, type, value, traceback):
"""
If :py:attr:`autocut <escpos.escpos.EscposIO.autocut>` is `True` (set by this class' constructor),
then :py:meth:`printer.cut() <escpos.escpos.Escpos.cut()>` will be called here.
"""
if not (type is not None and issubclass(type, Exception)):
if self.autocut:
self.printer.cut()
if self.autoclose:
self.close()

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# -*- coding: utf-8 -*-
""" ESC/POS Exceptions classes
Result/Exit codes:
- `0` = success
- `10` = No Barcode type defined :py:exc:`~escpos.exceptions.BarcodeTypeError`
- `20` = Barcode size values are out of range :py:exc:`~escpos.exceptions.BarcodeSizeError`
- `30` = Barcode text not supplied :py:exc:`~escpos.exceptions.BarcodeCodeError`
- `40` = Image height is too large :py:exc:`~escpos.exceptions.ImageSizeError`
- `50` = No string supplied to be printed :py:exc:`~escpos.exceptions.TextError`
- `60` = Invalid pin to send Cash Drawer pulse :py:exc:`~escpos.exceptions.CashDrawerError`
- `70` = Invalid number of tab positions :py:exc:`~escpos.exceptions.TabPosError`
- `80` = Invalid char code :py:exc:`~escpos.exceptions.CharCodeError`
- `90` = USB device not found :py:exc:`~escpos.exceptions.USBNotFoundError`
- `100` = Set variable out of range :py:exc:`~escpos.exceptions.SetVariableError`
- `200` = Configuration not found :py:exc:`~escpos.exceptions.ConfigNotFoundError`
- `210` = Configuration syntax error :py:exc:`~escpos.exceptions.ConfigSyntaxError`
- `220` = Configuration section not found :py:exc:`~escpos.exceptions.ConfigSectionMissingError`
:author: `Manuel F Martinez <manpaz@bashlinux.com>`_ and others
:organization: Bashlinux and `python-escpos <https://github.com/python-escpos>`_
:copyright: Copyright (c) 2012 Bashlinux
:license: GNU GPL v3
"""
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
from __future__ import unicode_literals
class Error(Exception):
""" Base class for ESC/POS errors """
def __init__(self, msg, status=None):
Exception.__init__(self)
self.msg = msg
self.resultcode = 1
if status is not None:
self.resultcode = status
def __str__(self):
return self.msg
class BarcodeTypeError(Error):
""" No Barcode type defined.
This exception indicates that no known barcode-type has been entered. The barcode-type has to be
one of those specified in :py:meth:`escpos.escpos.Escpos.barcode`.
The returned error code is `10`.
"""
def __init__(self, msg=""):
Error.__init__(self, msg)
self.msg = msg
self.resultcode = 10
def __str__(self):
return "No Barcode type is defined ({msg})".format(msg=self.msg)
class BarcodeSizeError(Error):
""" Barcode size is out of range.
This exception indicates that the values for the barcode size are out of range.
The size of the barcode has to be in the range that is specified in :py:meth:`escpos.escpos.Escpos.barcode`.
The resulting returncode is `20`.
"""
def __init__(self, msg=""):
Error.__init__(self, msg)
self.msg = msg
self.resultcode = 20
def __str__(self):
return "Barcode size is out of range ({msg})".format(msg=self.msg)
class BarcodeCodeError(Error):
""" No Barcode code was supplied.
No data for the barcode has been supplied in :py:meth:`escpos.escpos.Escpos.barcode`.
The returncode for this exception is `30`.
"""
def __init__(self, msg=""):
Error.__init__(self, msg)
self.msg = msg
self.resultcode = 30
def __str__(self):
return "No Barcode code was supplied"
class ImageSizeError(Error):
""" Image height is longer than 255px and can't be printed.
The returncode for this exception is `40`.
"""
def __init__(self, msg=""):
Error.__init__(self, msg)
self.msg = msg
self.resultcode = 40
def __str__(self):
return "Image height is longer than 255px and can't be printed"
class TextError(Error):
""" Text string must be supplied to the `text()` method.
This exception is raised when an empty string is passed to :py:meth:`escpos.escpos.Escpos.text`.
The returncode for this exception is `50`.
"""
def __init__(self, msg=""):
Error.__init__(self, msg)
self.msg = msg
self.resultcode = 50
def __str__(self):
return "Text string must be supplied to the text() method"
class CashDrawerError(Error):
""" Valid pin must be set in order to send pulse.
A valid pin number has to be passed onto the method :py:meth:`escpos.escpos.Escpos.cashdraw`.
The returncode for this exception is `60`.
"""
def __init__(self, msg=""):
Error.__init__(self, msg)
self.msg = msg
self.resultcode = 60
def __str__(self):
return "Valid pin must be set to send pulse"
class TabPosError(Error):
""" Valid tab positions must be in the range 0 to 16.
This exception is raised by :py:meth:`escpos.escpos.Escpos.control`.
The returncode for this exception is `70`.
"""
def __init__(self, msg=""):
Error.__init__(self, msg)
self.msg = msg
self.resultcode = 70
def __str__(self):
return "Valid tab positions must be in the range 0 to 16"
class CharCodeError(Error):
""" Valid char code must be set.
The supplied charcode-name in :py:meth:`escpos.escpos.Escpos.charcode` is unknown.
Ths returncode for this exception is `80`.
"""
def __init__(self, msg=""):
Error.__init__(self, msg)
self.msg = msg
self.resultcode = 80
def __str__(self):
return "Valid char code must be set"
class USBNotFoundError(Error):
""" Device wasn't found (probably not plugged in)
The USB device seems to be not plugged in.
Ths returncode for this exception is `90`.
"""
def __init__(self, msg=""):
Error.__init__(self, msg)
self.msg = msg
self.resultcode = 90
def __str__(self):
return "USB device not found"
class SetVariableError(Error):
""" A set method variable was out of range
Check set variables against minimum and maximum values
Ths returncode for this exception is `100`.
"""
def __init__(self, msg=""):
Error.__init__(self, msg)
self.msg = msg
self.resultcode = 100
def __str__(self):
return "Set variable out of range"
# Configuration errors
class ConfigNotFoundError(Error):
""" The configuration file was not found
The default or passed configuration file could not be read
Ths returncode for this exception is `200`.
"""
def __init__(self, msg=""):
Error.__init__(self, msg)
self.msg = msg
self.resultcode = 200
def __str__(self):
return "Configuration not found ({msg})".format(msg=self.msg)
class ConfigSyntaxError(Error):
""" The configuration file is invalid
The syntax is incorrect
Ths returncode for this exception is `210`.
"""
def __init__(self, msg=""):
Error.__init__(self, msg)
self.msg = msg
self.resultcode = 210
def __str__(self):
return "Configuration syntax is invalid ({msg})".format(msg=self.msg)
class ConfigSectionMissingError(Error):
""" The configuration file is missing a section
The part of the config asked for doesn't exist in the loaded configuration
Ths returncode for this exception is `220`.
"""
def __init__(self, msg=""):
Error.__init__(self, msg)
self.msg = msg
self.resultcode = 220
def __str__(self):
return "Configuration section is missing ({msg})".format(msg=self.msg)

90
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""" Image format handling class
This module contains the image format handler :py:class:`EscposImage`.
:author: `Michael Billington <michael.billington@gmail.com>`_
:organization: `python-escpos <https://github.com/python-escpos>`_
:copyright: Copyright (c) 2016 Michael Billington <michael.billington@gmail.com>
:license: GNU GPL v3
"""
from PIL import Image, ImageOps
class EscposImage(object):
"""
Load images in, and output ESC/POS formats.
The class is designed to efficiently delegate image processing to
PIL, rather than spend CPU cycles looping over pixels.
"""
def __init__(self, img_source):
"""
Load in an image
:param img_source: PIL.Image, or filename to load one from.
"""
if isinstance(img_source, Image.Image):
img_original = img_source
else:
img_original = Image.open(img_source)
# Convert to white RGB background, paste over white background
# to strip alpha.
img_original = img_original.convert('RGBA')
im = Image.new("RGB", img_original.size, (255, 255, 255))
im.paste(img_original, mask=img_original.split()[3])
# Convert down to greyscale
im = im.convert("L")
# Invert: Only works on 'L' images
im = ImageOps.invert(im)
# Pure black and white
self._im = im.convert("1")
@property
def width(self):
"""
Width of image in pixels
"""
width_pixels, _ = self._im.size
return width_pixels
@property
def width_bytes(self):
"""
Width of image if you use 8 pixels per byte and 0-pad at the end.
"""
return (self.width + 7) >> 3
@property
def height(self):
"""
Height of image in pixels
"""
_, height_pixels = self._im.size
return height_pixels
def to_column_format(self, high_density_vertical=True):
"""
Extract slices of an image as equal-sized blobs of column-format data.
:param high_density_vertical: Printed line height in dots
"""
im = self._im.transpose(Image.ROTATE_270).transpose(Image.FLIP_LEFT_RIGHT)
line_height = 24 if high_density_vertical else 8
width_pixels, height_pixels = im.size
top = 0
left = 0
while left < width_pixels:
box = (left, top, left + line_height, top + height_pixels)
im_slice = im.transform((line_height, height_pixels), Image.EXTENT, box)
im_bytes = im_slice.tobytes()
yield(im_bytes)
left += line_height
def to_raster_format(self):
"""
Convert image to raster-format binary
"""
return self._im.tobytes()

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#!/usr/bin/python
# -*- coding: utf-8 -*-
""" This module contains the implementations of abstract base class :py:class:`Escpos`.
:author: `Manuel F Martinez <manpaz@bashlinux.com>`_ and others
:organization: Bashlinux and `python-escpos <https://github.com/python-escpos>`_
:copyright: Copyright (c) 2012 Bashlinux
:license: GNU GPL v3
"""
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
from __future__ import unicode_literals
import usb.core
import usb.util
import serial
import socket
from .escpos import Escpos
from .exceptions import USBNotFoundError
class Usb(Escpos):
""" USB printer
This class describes a printer that natively speaks USB.
inheritance:
.. inheritance-diagram:: escpos.printer.Usb
:parts: 1
"""
def __init__(self, idVendor, idProduct, interface=0, in_ep=0x82, out_ep=0x01, *args, **kwargs):
"""
:param idVendor: Vendor ID
:param idProduct: Product ID
:param interface: USB device interface
:param in_ep: Input end point
:param out_ep: Output end point
"""
Escpos.__init__(self, *args, **kwargs)
self.idVendor = idVendor
self.idProduct = idProduct
self.interface = interface
self.in_ep = in_ep
self.out_ep = out_ep
self.open()
def open(self):
""" Search device on USB tree and set it as escpos device """
self.device = usb.core.find(idVendor=self.idVendor, idProduct=self.idProduct)
if self.device is None:
raise USBNotFoundError("Device not found or cable not plugged in.")
check_driver = None
try:
check_driver = self.device.is_kernel_driver_active(0)
except NotImplementedError:
pass
if check_driver is None or check_driver:
try:
self.device.detach_kernel_driver(0)
except usb.core.USBError as e:
if check_driver is not None:
print("Could not detatch kernel driver: {0}".format(str(e)))
try:
self.device.set_configuration()
self.device.reset()
except usb.core.USBError as e:
print("Could not set configuration: {0}".format(str(e)))
def _raw(self, msg):
""" Print any command sent in raw format
:param msg: arbitrary code to be printed
:type msg: bytes
"""
self.device.write(self.out_ep, msg, self.interface)
def close(self):
""" Release USB interface """
if self.device:
usb.util.dispose_resources(self.device)
self.device = None
class Serial(Escpos):
""" Serial printer
This class describes a printer that is connected by serial interface.
inheritance:
.. inheritance-diagram:: escpos.printer.Serial
:parts: 1
"""
def __init__(self, devfile="/dev/ttyS0", baudrate=9600, bytesize=8, timeout=1,
parity=serial.PARITY_NONE, stopbits=serial.STOPBITS_ONE,
xonxoff=False, dsrdtr=True, *args, **kwargs):
"""
:param devfile: Device file under dev filesystem
:param baudrate: Baud rate for serial transmission
:param bytesize: Serial buffer size
:param timeout: Read/Write timeout
:param parity: Parity checking
:param stopbits: Number of stop bits
:param xonxoff: Software flow control
:param dsrdtr: Hardware flow control (False to enable RTS/CTS)
"""
Escpos.__init__(self, *args, **kwargs)
self.devfile = devfile
self.baudrate = baudrate
self.bytesize = bytesize
self.timeout = timeout
self.parity = parity
self.stopbits = stopbits
self.xonxoff = xonxoff
self.dsrdtr = dsrdtr
self.open()
def open(self):
""" Setup serial port and set is as escpos device """
self.device = serial.Serial(port=self.devfile, baudrate=self.baudrate,
bytesize=self.bytesize, parity=self.parity,
stopbits=self.stopbits, timeout=self.timeout,
xonxoff=self.xonxoff, dsrdtr=self.dsrdtr)
if self.device is not None:
print("Serial printer enabled")
else:
print("Unable to open serial printer on: {0}".format(str(self.devfile)))
def _raw(self, msg):
""" Print any command sent in raw format
:param msg: arbitrary code to be printed
:type msg: bytes
"""
self.device.write(msg)
def close(self):
""" Close Serial interface """
if self.device is not None:
self.device.flush()
self.device.close()
class Network(Escpos):
""" Network printer
This class is used to attach to a networked printer. You can also use this in order to attach to a printer that
is forwarded with ``socat``.
If you have a local printer on parallel port ``/dev/usb/lp0`` then you could start ``socat`` with:
.. code-block:: none
socat -u TCP4-LISTEN:4242,reuseaddr,fork OPEN:/dev/usb/lp0
Then you should be able to attach to port ``4242`` with this class.
Otherwise the normal usecase would be to have a printer with ethernet interface. This type of printer should
work the same with this class. For the address of the printer check its manuals.
inheritance:
.. inheritance-diagram:: escpos.printer.Network
:parts: 1
"""
def __init__(self, host, port=9100, timeout=60, *args, **kwargs):
"""
:param host : Printer's hostname or IP address
:param port : Port to write to
:param timeout : timeout in seconds for the socket-library
"""
Escpos.__init__(self, *args, **kwargs)
self.host = host
self.port = port
self.timeout = timeout
self.open()
def open(self):
""" Open TCP socket with ``socket``-library and set it as escpos device """
self.device = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self.device.settimeout(self.timeout)
self.device.connect((self.host, self.port))
if self.device is None:
print("Could not open socket for {0}".format(self.host))
def _raw(self, msg):
""" Print any command sent in raw format
:param msg: arbitrary code to be printed
:type msg: bytes
"""
self.device.sendall(msg)
def close(self):
""" Close TCP connection """
self.device.shutdown(socket.SHUT_RDWR)
self.device.close()
class File(Escpos):
""" Generic file printer
This class is used for parallel port printer or other printers that are directly attached to the filesystem.
Note that you should stay away from using USB-to-Parallel-Adapter since they are unreliable
and produce arbitrary errors.
inheritance:
.. inheritance-diagram:: escpos.printer.File
:parts: 1
"""
def __init__(self, devfile="/dev/usb/lp0", *args, **kwargs):
"""
:param devfile : Device file under dev filesystem
"""
Escpos.__init__(self, *args, **kwargs)
self.devfile = devfile
self.open()
def open(self):
""" Open system file """
self.device = open(self.devfile, "wb")
if self.device is None:
print("Could not open the specified file {0}".format(self.devfile))
def flush(self):
""" Flush printing content """
self.device.flush()
def _raw(self, msg):
""" Print any command sent in raw format
:param msg: arbitrary code to be printed
:type msg: bytes
"""
self.device.write(msg)
def close(self):
""" Close system file """
self.device.flush()
self.device.close()
class Dummy(Escpos):
""" Dummy printer
This class is used for saving commands to a variable, for use in situations where
there is no need to send commands to an actual printer. This includes
generating print jobs for later use, or testing output.
inheritance:
.. inheritance-diagram:: escpos.printer.Dummy
:parts: 1
"""
def __init__(self, *args, **kwargs):
"""
"""
Escpos.__init__(self, *args, **kwargs)
self._output_list = []
def _raw(self, msg):
""" Print any command sent in raw format
:param msg: arbitrary code to be printed
:type msg: bytes
"""
self._output_list.append(msg)
@property
def output(self):
""" Get the data that was sent to this printer """
return b''.join(self._output_list)
def close(self):
pass