Question: why empty introspeciton files from org.freedesktop.Notifications and the like ? Repository of org.freedesktop introspection files available ?

rony rony at
Mon Jul 18 02:41:18 PDT 2011

Dear Simon,

thank you very much!

On 18.07.2011 11:29, Simon McVittie wrote:
> On Sun, 17 Jul 2011 at 13:13:58 +0200, rony wrote:
>> Still another question: are there general rules whether a "default
>> object path" should exist and what the format of such a "default object
>> path" should be, in the case that one cannot research/find out what the
>> object path should be in order to call Introspect()?
> Find the documentation for/definition of the D-Bus API you're using (in this
> case org.freedesktop.Notifications), read it, it should specify how to find
> the "entry point" object path. If not, then that API definition is incomplete
> and you should complain to its bug tracker, assuming it has one.
Well, I tried to find the org.freedesktop.Notifications introspection
definition, but was not really successful (except for the OpenMoko
page), hence asking for pointers (URLs?) where one could find at least
the introspection definitions/files for the org.freedesktop.* services.

> Another way you could have found the right object path is: you might have
> noticed that when you introspected "/", it indicated that it had a child node
> called "org". If you introspect "/org", it will have a child node
> "freedesktop". Carry on introspecting "/org/freedesktop", and so on, until you
> reach an object path that has some more interesting methods.
> (To do this in an automated way, you can use the GUI D-Bus debugging tool
> "d-feet": it browses introspection data in exactly the same way.)
Wow, that is just a great piece of information, thank you very much,
indeed !

>> [So far I had wrongly assumed a root path "/", but it could also be the
>> case that the bus name is used, where the dots get replaced by slashes
>> plus inserting a slash at the beginning of the object path.]
> Using an object path corresponding to the bus name in this way is a popular
> convention, but not guaranteed to be used.
> Using '/' as an object path is usually a bad idea for the reasons Lennart and
> Havoc describe here: <>
> but some people use it anyway.
Again, thank you *very* much indeed for your extremely helpful information !

Best regards,


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