[maemo-developers] [pymaemo] hildon-desktop: getting D-Bus?

[From: Thomas Wälti]

Thanks to all of you! Based on your feedbacks, I was able to find a solution :-)
So here is on how to get your hands on a dbus system object in a
python-based hildon-home widget in a way that you can attach
callbacks.

from dbus.mainloop.glib import DBusGMainLoop
dbus.mainloop.glib.DBusGMainLoop(set_as_default=True)
dbus.mainloop.glib.threads_init()

class YourHomePlugin(hildondesktop.HomePluginItem):

  def __init__(self):
    self.bus = dbus.bus.BusConnection("unix:path=/var/run/dbus/system_bus_socket")


This means that auto-recording now works in my Recaller widget...
I'll post a new version to Extras-Devel during the next days.

Thanks again to everybody!
-Tom


2010/4/14 Kimmo Hämäläinen <kimmo.hamalainen at nokia.com>:
> On Tue, 2010-04-13 at 23:19 +0200, ext Thomas Waelti wrote:
>> (Crossposting to maemo-devel, hoping for a Hildon-Desktop or D-Bus expert to pick this up. Original thread is at https://garage.maemo.org/pipermail/pymaemo-developers/2010-April/001444.html )
>>
>> Thanks for a very interesting input. Unfortunately, it didn't work for my needs, as I must get my hands on the SYSTEM bus, not the Session one.
>> I tried your example, changing it to
>>
>>     self.bus = dbus.bus.BusConnection("unix:abstract=/var/run/dbus/system_bus_socket")
>>
>> However, I get this error:
>> dbus.exceptions.DBusException: org.freedesktop.DBus.Error.NoServer: Failed to connect to socket /var/run/dbus/system_bus_socket: Connection refused
>>
>>
>> Isn't this the correct address of the system dbus?
>> Or do I have a permission (or other) problem when trying to get on the system-dbus from hildon-desktop?
>
> You mean hildon-home (hildon-desktop does not have plugins). I found
> some code from
> http://dbus.freedesktop.org/doc/dbus-python/doc/tutorial.html#connecting-to-the-bus
>
> =====
> import dbus
> from dbus.mainloop.glib import DBusGMainLoop
>
> dbus_loop = DBusGMainLoop()
>
> bus = dbus.SessionBus(mainloop=dbus_loop)
> =====
>
> Just replace SessionBus with SystemBus, yes?
>
> -Kimmo
>
>>
>>
>> Thanks all
>> -Tom
>>
>>
>> > As a follow-up to the discussion about d-bus from a hildon widget a
>> > few days ago that I found out while having the same problem, I've
>> > finally managed to get something that seems to be working for me:
>> >
>> > # Create a session bus.
>> > import dbus
>> > from dbus.mainloop.glib import DBusGMainLoop
>> > dbus.mainloop.glib.DBusGMainLoop(set_as_default=True)
>> > from os import environ
>> > bus = dbus.bus.BusConnection(environ["DBUS_SESSION_BUS_ADDRESS"])
>> >
>> > And then bus can be used as usual. I haven't done a whole lot of
>> > testing, as I just found this out, but it appears to be working both
>> > in command line mode and as a home widget.
>> >  Yves.
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