simple search api (was Re: mimetype standardisation by testsets)

John (J5) Palmieri johnp at
Mon Dec 18 19:36:49 EET 2006

On Sat, 2006-12-16 at 17:53 -0800, Bastian, Waldo wrote:
> John,
> See the reference below to DBUS sessions. Doesn't DBUS have the ability
> to inform any client about connects and disconnects of other clients to
> the bus?

So yes, you can track any service on the bus by simply listening for
NameOwnerChanged signals.  The NameOwnerChanged signal has three
parameters, bus name, old owner's unique name, new owner's unique name.
If the old owner is an empty string then it is a new name on the bus.
If the new owner is an empty string then the name has dropped off the
bus.  If both are populated then the name has moved from the old owner
to the new owner.  Make sure you only listen to signals you care about
or your app will continually wake up every time a signal is sent which
is bad for battery life on laptops.  You can do signal matching on
parameters (arg0= arg1= ... arg9=) to restrict what signals you receive.

John (J5) Palmieri <johnp at>

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