Re: [dbus-cplusplus-devel] Problem with Introspectable

[Andreas V. <li...@br...>]

Am Wed, 19 Aug 2009 11:01:13 -0400 schrieb dorphell:

Hello dorphell,

only to be sure. Do you both use the same DBus-C++ from gitorious or
fd.org?

regards
Andreas

> 
> Hello all,
> 
> I'm having problems getting a dbus-c++ based app, Youki Media Player,
> to run properly -- and I was hoping someone here would have some
> ideas of what could be wrong.
> 
> Specifically, the problem is that the app won't register
> Introspectable for some reason, when it absolutely should and does on
> the developer's system (Milosz) with the same exact version of the
> app and dbus-c++ (we both compiled from the same source package).
> 
> With the 'echo' example in the dbus-c++ source tree, it works:
> ----------------
> $ export DBUSXX_VERBOSE=1
> $ ./echo-server
> dbus-c++: registering stubs for connection 0xf1ec40
> dbus-c++: added watch 0xf207e0 (off) fd=3 flags=2
> dbus-c++: added watch 0xf20870 (on) fd=3 flags=1
> dbus-c++: :1.31: registering bus name
> org.freedesktop.DBus.Examples.Echo dbus-c++: added timeout 0xf1f1f0
> (on) interval=25000 dbus-c++: removed timeout 0xf1f1f0
> dbus-c++: added timeout 0xf1eff0 (on) interval=25000
> dbus-c++: removed timeout 0xf1eff0
> dbus-c++: :1.31: added match rule
> destination='org.freedesktop.DBus.Examples.Echo'
> dbus-c++: adding interface org.freedesktop.DBus.EchoDemo
> dbus-c++: adding interface org.freedesktop.DBus.Introspectable
> dbus-c++: Introspectable
> dbus-c++: registering local object /org/freedesktop/DBus/Examples/Echo
> dbus-c++: entering dispatcher 0x616bc0
> dbus-c++: dispatching on 0xf1ec40
> dbus-c++: dispatching on 0xf1ec40
> dbus-c++: all dispatching done on 0xf1ec40
> ----------------
> 
> But when I run the app, for some reason I can't get the Introspectable
> even though it's in the app code and Milosz is certain there is no
> problem in Youki's code.
> I mean... it "just works" for him and the point at which it fails
> seems too trivial, it's such a basic fundamental constructor call,
> that we cannot find any way it can be wrong in the application
> itself... Almost like a hello-world program failing ;-)
> ----------------
> $ /usr/libexec/youki-mlibman-bin
> ...
> ... [normal application startup output]
> ...
> dbus-c++: registering stubs for connection 0xb58a70
> dbus-c++: glib: added watch 0xa21cf0 (off) fd=10 flags=2
> dbus-c++: glib: added watch 0xa21d20 (on) fd=10 flags=1
> dbus-c++: :1.42: registering bus name info.backtrace.Youki.MLibMan
> dbus-c++: glib: added timeout 0xa21c10 (on)
> dbus-c++: glib: removed timeout 0xa21c10
> dbus-c++: glib: added timeout 0xa21c10 (on)
> dbus-c++: glib: removed timeout 0xa21c10
> dbus-c++: :1.42: added match rule
> destination='info.backtrace.Youki.MLibMan'
> ...
> ... [more application startup output]
> ...
> dbus-c++: dispatching on 0xb58a70
> dbus-c++: dispatching on 0xb58a70
> dbus-c++: all dispatching done on 0xb58a70
> ----------------
> 
> ==> No "adding interface org.freedesktop.DBus.Introspectable"
> 
> We tried running it in gdb as well, trying to break out at the
> introspection.cpp line in the IntrospectableAdaptor constructor, but
> it didn't break out, as if it's not being called at all.
> 
> And as you can see, the dbus session is created. I can see the active
> info.backtrace.Youki.MLibMan in dbus-browser, but I can't introspec it
> (i.e. the browser pane shows empty).
> 
> And the app doesn't crash/exit. It keeps running (though the overall
> application can't function since the dbus communication with its GUI
> doesn't work)
> 
> If you would like to take a look at where in Youki
> DBus::IntrospectableAdaptor is called, here it is:
> 
> mlibmanager.hh ==>  http://pastebin.ca/1534526
> mlibmanager.cc ==>  http://pastebin.ca/1534528
> 
> We debugged this for many hours trying to narrow it down but have run
> out of ideas. If anyone has any suggestions, I'm willing to try
> anything.
> 
> Thanks in advance,
> dorphell
> 
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