glib bindings with glib signals

Gary Kramlich grim at
Tue Jun 26 18:12:39 PDT 2007

Hi all,

I'm trying to emit a glib signal on an object that's exported over dbus, 
which in glib has a marshal signature of VOID:OBJECT.  In my 
introspection file, I'm defining the argument as an object path, but 
with an introspection call in dbus-viewer, it returning '<arg type=""/>' 
for the signals.

When the signal is emitted in the daemon, I receive this warning (Note 
this is coming from my log handler, and at this time I'm not certain 
what exactly is writing it):

   Warning: No marshaller registered for type "GfFeed"
   Warning: failed to marshal parameter 1 for signal RegisteredFeed

Also, when I fire up a client, I'm seeing:

   Warning: No marshaller for signature of signal 'registered-feed'
   Warning: No marshaller for signature of signal 'unregistered-feed'

The camel case instances are the signals on dbus, the hyphenated ones 
are in glib.

So basically, the questions I have are, is it possible to have an 
argument of an object path in a glib based signal emitted over dbus, and 
if so, does the bindings map this automagically, or is there more magic 
I need to perform like having the proxy object re-emit it?

Also, is there any documentation on glib signals over dbus?  I've 
searched and searched, and found very minimal details, and absolutely 
nothing regarding object paths.


Gary Kramlich <grim at>

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