Thanks it is working when using a Raspberry pi, but if you are using Windows Virtual IOT, it is necesary to mod this app hw_drivers\iot_handlers\drivers\PrinterDriver_W.py
add these lines
import re
def format_escpos_bit_image_raster(self, im):
""" prints with the `GS v 0`-command """
width = int((im.width + 7) / 8)
raster_send = b'\x1d\x76\x30\x00'
max_slice_height = 255
raster_data = b''
dots = im.tobytes()
while len(dots):
im_slice = dots[:width*max_slice_height]
slice_height = int(len(im_slice) / width)
raster_data += raster_send + width.to_bytes(2, 'little') + slice_height.to_bytes(2, 'little') + im_slice
dots = dots[width*max_slice_height:]
return raster_data
def extract_columns_from_picture(self, im, line_height):
# Code inspired from python esc pos library:
# https://github.com/python-escpos/python-escpos/blob/4a0f5855ef118a2009b843a3a106874701d8eddf/src/escpos/image.py#L73-L89
width_pixels, height_pixels = im.size
for left in range(0, width_pixels, line_height):
box = (left, 0, left + line_height, height_pixels)
im_chunk = im.transform(
(line_height, height_pixels),
Image.EXTENT,
box
)
yield im_chunk.tobytes()
def format_escpos_bit_image_column(self, im, high_density_vertical=True,
high_density_horizontal=True,
size_scale=100):
""" prints with the `ESC *`-command
reference: https://reference.epson-biz.com/modules/ref_escpos/index.php?content_id=88
:param im: PIL image to print
:param high_density_vertical: print in high density in vertical direction
:param high_density_horizontal: print in high density in horizontal direction
:param size_scale: picture scale in percentage,
e.g: 50 -> half the size (horizontally and vertically)
"""
size_scale_ratio = size_scale / 100
size_scale_width = int(im.width * size_scale_ratio)
size_scale_height = int(im.height * size_scale_ratio)
im = im.resize((size_scale_width, size_scale_height))
# escpos ESC * command print column per column
# (instead of usual row by row).
# So we transpose the picture to ease the calculations
im = im.transpose(Image.ROTATE_270).transpose(Image.FLIP_LEFT_RIGHT)
# Most of the code here is inspired from python escpos library
# https://github.com/python-escpos/python-escpos/blob/4a0f5855ef118a2009b843a3a106874701d8eddf/src/escpos/escpos.py#L237C9-L251
ESC = b'\x1b'
density_byte = (1 if high_density_horizontal else 0) + \
(32 if high_density_vertical else 0)
nL = im.height & 0xFF
nH = (im.height >> 8) & 0xFF
HEADER = ESC + b'*' + bytes([density_byte, nL, nH])
raster_data = ESC + b'3\x10' # Adjust line-feed size
line_height = 24 if high_density_vertical else 8
for column in self.extract_columns_from_picture(im, line_height):
raster_data += HEADER + column + b'\n'
raster_data += ESC + b'2' # Reset line-feed size
return raster_data
def format_escpos(self, im):
# Epson support different command to print pictures.
# We use by default "GS v 0", but it is incompatible with certain
# printer models (like TM-U2x0)
# As we are pretty limited in the information that we have, we will
# use the printer name to parse some configuration value
# Printer name examples:
# EpsonTMM30
# -> Print using raster mode
# TM-U220__IMC_LDV_LDH_SCALE70__
# -> Print using column bit image mode (without vertical and
# horizontal density and a scale of 70%)
# Default image printing mode
image_mode = 'raster'
options_str = self.device_name.split('__')
option_str = ""
if len(options_str) > 2:
option_str = options_str[1].upper()
if option_str.startswith('IMC'):
image_mode = 'column'
if image_mode == 'column':
# Default printing mode parameters
high_density_vertical = True
high_density_horizontal = True
scale = 100
# Parse the printer name to get the needed parameters
# The separator need to not be filtered by `get_identifier`
options = option_str.split('_')
for option in options:
if option == 'LDV':
high_density_vertical = False
elif option == 'LDH':
high_density_horizontal = False
elif option.startswith('SCALE'):
scale_value_str = re.search(r'\d+$', option)
if scale_value_str is not None:
scale = int(scale_value_str.group())
else:
raise ValueError(
"Missing printer SCALE parameter integer "
"value in option: " + option)
res = self.format_escpos_bit_image_column(im,
high_density_vertical,
high_density_horizontal,
scale)
else:
res = self.format_escpos_bit_image_raster(im)
return res + RECEIPT_PRINTER_COMMANDS['escpos']['cut']
Remove these
def format_escpos(self, im):
width = int((im.width + 7) / 8)
raster_send = b'\x1d\x76\x30\x00'
max_slice_height = 255
raster_data = b''
dots = im.tobytes()
while dots:
im_slice = dots[:width*max_slice_height]
slice_height = int(len(im_slice) / width)
raster_data += raster_send + width.to_bytes(2, 'little') + slice_height.to_bytes(2, 'little') + im_slice
dots = dots[width*max_slice_height:]
return raster_data + RECEIPT_PRINTER_COMMANDS['escpos']['cut']
