Dynamic Paperlength for PS or PDF device

[Wim Stockman]

I am making a simple cash register with a ticket printer.
and I want to figure out how I can detect how long my physical paper should
be without cutting some text off. So I can set it for the device. The width
is fixed so that is no issue.
Eventually I can run it in some loop and detect when it stops having more
than one page.
Kind Regards,
Wim Stockman