[cups-devel] Capture raw print data, append QR code before sending to printer

[Helge Blischke]

> Am 04.02.2016 um 10:09 schrieb CK TONG <mail at huelearning.com>:
> 
> I am trying to intercept raw print data stream from a POS system, modify it
> before sending it to a networked Epson thermal receipt printer as described
> below:
> 
> 
> i) Intercept print data,
> 
> ii) use the data to encode a QR code,
> 
> iii) append it to the captured data,
> 
> iv) send to printer
> 
> 
> I have limited knowledge on linux and CUPS. Appreciate if someone could
> direct me to relevant resource for further research.
> 
> 
> Thanks in advance!
> 
> 
> TG

First, we must know what kind of data you get from your POS system in order to 
think about how to accomplish your items II and III.

Helge