Currently, with Python3 and Bleak, open server.py and go to http://localhost:8095 in browser, open cat printer and bluetooth of your computer, then do the works.

Why?

These bluetooth cat printers, with module name GB01, GB02 and GT01, have poor support at applications.

Official apps are, proprietary, also have only mobile version.

I hate both proprietary and platform-binding things. So I decided to make this.

Thankfully, people here are really warm-hearted, logged their experiences online in a central repo, and I am able to walk further 😃

Developer Note

This application uses server/client module, and have fewest possible dependencies on server side.

Prepare

Python3 & Browser
fabric.min.js
html2canvas.min.js

Supported Platforms

Support for both Windows and GNU/Linux are included. And Windows release package will contain all needed things for a normal user to play with.

Plans

Support rich edit features as the official app for cat printers (iPrint & 精准学习)
Make remote-print by web interface more standard/compatible/secure

Possible features:

Remote print with printer protocols

Other

Routine of image data when printing:

Image.png -> paint to canvas rawdata -> monochrome filter -> collect canvas rawdata to pbm format -> send to server -> extract information -> compile to raw data for printer -> bluetooth communication to printer

Note: PBM is a easy monochrome image format:

P4
# {comment}
{width} {height}
{raw bytes, one byte for 8 bits of 0 or 1, these consists the image visually}

Files

server.py: Contains a BaseHTTP server that hooks user actions and printer driver
printer.py: Contains the driver of bluetooth cat printer, which depends on bleak. You can also run this file in commandline.

Languages

Python 38.1%

JavaScript 32%

HTML 14.9%

CSS 9.9%

TypeScript 2.4%

Other 2.7%