public unowned DBusConnection? get_dbus_connection ()
Gets the DBusConnection being used by the application, or null.
If Application is using its D-Bus backend then this function will return the DBusConnection being used for uniqueness and communication with the desktop environment and other instances of the application.
If Application is not using D-Bus then this function will return null. This includes the situation where the D-Bus backend would normally be in use but we were unable to connect to the bus.
This function must not be called before the application has been registered. See get_is_registered.
a DBusConnection, or null