On Mittwoch, 14. Juli 2021 19:47:42 CEST Andrei Borzenkov via networkmanager-
list wrote:
[...]
> I do not see any reference to object here so I have no idea what this
> code does. The following certainly works
>
> def properties_changed(interface_name, changed_properties,
> invalidated_properties):
> print (interface_name, changed_properties, invalidated_properties)
>
>
> bus = dbus.SystemBus()
> obj = bus.get_object("org.freedesktop.NetworkManager",
> "/org/freedesktop/NetworkManager")
> iface = dbus.Interface(obj, "org.freedesktop.DBus.Properties")
> iface.connect_to_signal("PropertiesChanged", properties_changed)
>
This example doesn't work here (probaly different python version?):
#!/usr/bin/python3
import dbus
def properties_changed(interface_name, changed_properties,
invalidated_properties):
print (interface_name, changed_properties, invalidated_properties)
bus = dbus.SystemBus()
obj = bus.get_object("org.freedesktop.NetworkManager",
"/org/freedesktop/NetworkManager")
iface = dbus.Interface(obj, "org.freedesktop.DBus.Properties")
iface.connect_to_signal("PropertiesChanged", properties_changed)
gives:
File "./b", line 13, in <module>
iface.connect_to_signal("PropertiesChanged", properties_changed)
File "/usr/lib/python3.8/site-packages/dbus/proxies.py", line 545, in
connect_to_signal
return self._obj.connect_to_signal(signal_name, handler_function,
File "/usr/lib/python3.8/site-packages/dbus/proxies.py", line 366, in
connect_to_signal
self._bus.add_signal_receiver(handler_function,
File "/usr/lib/python3.8/site-packages/dbus/bus.py", line 148, in
add_signal_receiver
match = super(BusConnection, self).add_signal_receiver(
File "/usr/lib/python3.8/site-packages/dbus/connection.py", line 402, 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(...)
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