Barcode not printed

[tuxmaster5000]

I have:

• [X ] searched open and closed issues for duplicates

Bug description

When I try to print barcode on the printer only an error will shown on the console.

Error message:

Using bitImageColumn software barcode renderer
Traceback (most recent call last):
  File "/home/<XX>/test2.py", line 27, in <module>
    p.barcode("12345678", "EAN8")
  File "/home/<XX>/lib64/python3.11/site-packages/escpos/escpos.py", line 599, in barcode
    self._sw_barcode(
  File "/home/<XX>/lib64/python3.11/site-packages/escpos/escpos.py", line 858, in _sw_barcode
    self.image(image, impl=impl, center=center)
  File "/home/<XX>/lib64/python3.11/site-packages/escpos/escpos.py", line 222, in image
    raise ImageWidthError("{} > {}".format(im.width, max_width))
escpos.exceptions.ImageWidthError: Image width is too large (201 > 200)

Steps to reproduce

code:

import escpos.printer
p = escpos.printer.File("/dev/usb/lp0", profile="TM-U220B")
# While the profile is buggy
p.profile.profile_data["media"]["width"]["pixels"] = 200
p.textln("EAN8")
# as far I know it will only fits vertical on the paper 
p.set(flip=True)
p.barcode("12345678", "EAN8")
p.set(flip=False)
p.textln("EAN13")
p.set(flip=True)
p.barcode("1234567890123", "EAN13")
p.cut()

Printer: Epson TM-U220B

python-escpos version: 3.1.dev6+g5914c7c

python version: 3.11.6

operating system: Fedora-38

[belono]

Hi @tuxmaster5000 !

Add the width=2 parameter to the barcode() method to reduce the module width of the rendered barcode to the minimum size:

p.barcode("12345678", "EAN8", width=2)

Note that, due to your printer having a low resolution, some long barcode types will not fit into the paper raising the former exception.

[tuxmaster5000]

Which the width=2 option, the printer starts printing, but only garbage output.

[belono]

Yeah, this is the same as in #598 . The printer does not support native hardware bar-code printing so the library automatically switches to software bar-code to render an image of the bar-code and relies on the image() method to print the image (bar-code). Again, the default values of the image() method are incompatible with the TM-U2xx series, so the printer ends up printing garbage.

We could workaround the barcode() method too to allow passing custom parameters to the image() method through its force_software parameter, taking care if possible of not break the current behavior of force_software which selects the best render mode based in the printer capabilities profile data.
However, if it is not too urgent for @tuxmaster5000 to have bar-code working I think it would be easier to add a field in the capabilities database and fix all this issues at a time.

[tuxmaster5000]

Hi @belono it will not be so urgent, because after fixed the qr part, this was an try if this also works.
I need more the qr code function, so waiting will not be an problem.