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I need to know in my application if the printer is being used by some other application.

Is there some way I can get notified? Via dbus perhaps, or something else?

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you need system-config-printer-applet.

system-config-printer-applet is a print job manager for CUPS. Normally it will display a printer icon in the notification area, greyed out when there are no print jobs for the current user. Clicking on the icon displays a simple print job manager for cancelling or reprinting jobs.

For package :

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I think he actually means something that can be used in his application's code to query dbus, like python-dbus. – user76204 Apr 16 '13 at 16:06
I mention that because " Is there some way I can get notified?" – Raja Apr 16 '13 at 16:09
That's correct Mik. – dmd Apr 16 '13 at 16:15

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