can't recognize the printer

[tanqhnguyen]

Hi,

I'm having some weird problems where brother_ql can't recognize the printer (I've tried with QL-700 and QL-810W) and therefore can't print.

Here is the error when I try to print something. I have confirmed that the laptop can bring normally using another tool

  File "/Library/Python/3.8/site-packages/brother_ql/backends/pyusb.py", line 78, in __init__
    vendor, product = int(vendor, 16), int(product, 16)
ValueError: invalid literal for int() with base 16: '0x2042_Љ'

and discover shows this

brother_ql --backend pyusb discover   
deprecation warning: brother_ql.devicedependent is deprecated and will be removed in a future release
INFO:brother_ql.output_helpers:  Found a label printer: usb://0x04f9:0x2042_Љ  (model: unknown)
usb://0x04f9:0x2042_Љ

Obviously 0x2042_Љ is not a valid 16-base int, but I'm not sure how to fix it

Some info about the environment
Mac OS
Python 3
[email protected] installed via pip 21
libusb latest version installed via brew

[michaeleekk]

@tanqhnguyen I had the same issue before. I think the code couldn't print the path of the printer properly. What I did is to go to System Information and look for the serial number to complete the string. The result should be something like usb://0x04f9:0x2086/000M7Z552861

[tanqhnguyen]

I have found the problem, it's because of pyusb version. The get_string (inside util) implementation of pyusb has been changed between 1.0.2 and 1.1.1. I had to force pyusb to be 1.0.2 for brother_ql to work correctly

I'm closing this issue for now