[cups.development] Access to IPP attributes in filters and backends

[Michael R Sweet]

urs-jakob.rueetschi at phz.ch wrote:
> I would like to read and modify IPP job attributes from within filters and backends. What's the best way to do so? Do I have to use httpConnect(), ippWrite() and friends? Is there a simpler / more direct method?

That is the only supported way to read attributes, however in general
filters cannot modify attributes since the job is active.

STATE: and PAGE: messages can be used to modify the
printer-state-message and job-media-sheets-completed attributes,
respectively.

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Michael R Sweet                        Senior Printing System Engineer