Re: GTK+ app development: avahi service browsing and Gtk+ main loop problem

[Andrei Macavei <andrei macavei89 gmail com>]

On 17.06.2014 12:43, Chris Vine wrote:
> I do not know python particularly well but you probably first need to
> explain why you are running two main loops.  Can't your program just
> use one, so that you can use the default main loop for both?
>
> Chris

Hi,
I haven't shown the full code of the ServiceDiscover class, I will post 
it here again after my message.

In the ServiceDiscover class , in the method discover() , a 
dbus.Interface object is connected to the signal "ItemNew" :
.....
self.sbrowser.connect_to_signal("ItemNew", self.handler)
.....

Afterwards it must call the main loop or else it cannot use the above 
signal I suppose. This has to be done inside the ServiceDiscover class.

The code for both the service publishing and service browsing using 
avahi is taken from avahi website:

http://avahi.org/wiki/PythonBrowseExample
http://avahi.org/wiki/PythonPublishExample

The problem is that I have to use a main loop inside the ServiceDiscover 
class, and another one for the gtk+ main window class.

I am copy-pasting the full traceback of the error:
----------------------------------------
Traceback (most recent call last):
  File "MainWindow.py", line 32, in <module>
    window = MainWindow()
  File "MainWindow.py", line 29, in __init__
    service_discover.discover()
  File "/home/kheops/gsoc/geysigning/network/AvahiDiscover.py", line 
28, in discover
    self.sbrowser.connect_to_signal("ItemNew", self.handler)
  File "/usr/lib/python2.7/dist-packages/dbus/proxies.py", line 544, in 
connect_to_signal
    dbus_interface, **keywords)
  File "/usr/lib/python2.7/dist-packages/dbus/proxies.py", line 369, in 
connect_to_signal
    **keywords)
  File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 148, in 
add_signal_receiver
    path, **keywords)
  File "/usr/lib/python2.7/dist-packages/dbus/connection.py", line 400, 
in add_signal_receiver
    self._require_main_loop()
RuntimeError: To make asynchronous calls, receive signals or export 
objects, D-Bus connections must be attached to a main loop by passing 
mainloop=... to the constructor or calling dbus.set_default_main_loop(...)
---------------------------------------


Here is a link on dpaste for the full avahi discover class:
http://dpaste.com/3DDGFER

~Andrei M.