would printing to a spooler be cross platform? I mean would this process you describe be similar if I wanted to print in win32 as it is in Linux?
thanks, todd
Roger Leigh wrote:
"Carl B. Constantine" <duckwing@xxxxxxxxxxx> writes:
I have some data I want to print out in my application. How do I do it? To make things a little different, I *might* print to one of those POS type printers (USB) not a regular printer.
Pointers? Which classes do I need to use?
GTK+ itself doesn't currently offer any printing support, so the question doesn't really involve GTK+ directly. You need to either
1) Open the printer device (e.g. /dev/usb/lp0) and write data to it. 2) Open a pipe to the printer spooler (e.g. lpr -P queuename) and then write the job data and close the connection.
By a POS printer, I take that to mean a 40 col receipt printer sort of thing. These are basic devices which are basically ASCII thermal printers plus some additional control codes and possibly some extra bitmap raster graphics mode. For these you just send the control codes inline with the text you're printing to either (1) or (2) above. Your program is entirely responsible for the formatting, layout and cutting etc.
For the work I do, I send jobs to a receipt printer via CUPS. After completion of a transaction, the receipt gets printed after a barely noticeable delay (< 0.5s).
Your best bet is to use a spooler. This also makes networked operation totally transparent, and is far more flexible. You can use libcups, lpc or lpstat etc. to get a list of all available printers if the user needs to choose one.
Regards, Roger
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