[PyQt] QtDBus not wrapped, trouble using dbus-python (communication hangs)

[Adeodato Simó]

Hello.

I've read in the list archives that QtDBus is not wrapped because there
would be severe limitations in the bindings, and a more pythonic version
of the bindings exists (dbus-python).

However, I'm having trouble with exporting an interface using those
bindings. I've started with the example-service.py file that comes with
dbus-python, and I've changed it to be a Qt mini-app with the following
diff (full file attached):

--- example-service.py~
+++ example-service.py
@@ -30,11 +30,13 @@
 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 # DEALINGS IN THE SOFTWARE.

-import gobject
+import sys

 import dbus
 import dbus.service
-import dbus.mainloop.glib
+import dbus.mainloop.qt
+
+from PyQt4 import QtGui

 class DemoException(dbus.DBusException):
     _dbus_error_name = 'com.example.DemoException'
@@ -71,13 +73,13 @@


 if __name__ == '__main__':
-    dbus.mainloop.glib.DBusGMainLoop(set_as_default=True)
+    dbus.mainloop.qt.DBusQtMainLoop(set_as_default=True)

     session_bus = dbus.SessionBus()
     name = dbus.service.BusName("com.example.SampleService", session_bus)
     object = SomeObject(session_bus, '/SomeObject')

-    mainloop = gobject.MainLoop()
-    print "Running example service."
-    print usage
-    mainloop.run()
+    app = QtGui.QApplication(sys.argv)
+    mw = QtGui.QMainWindow()
+    mw.show()
+    app.exec_()

The application starts, with this warning:

  QSocketNotifier: Can only be used with threads started with QThread
  QSocketNotifier: Can only be used with threads started with QThread

qdbus lists the service, but trying to lists its objects hangs, and
sending a message does not work either:

% qdbus | grep example
 com.example.SampleService

% qdbus com.example.SampleService
/
Cannot introspect object / at com.example.SampleService:
org.freedesktop.DBus.Error.NoReply (Did not receive a reply. Possible causes
include: the remote application did not send a reply, the message bus security
policy blocked the reply, the reply timeout expired, or the network connection
was broken.)

% qdbus com.example.SampleService /SomeObject com.example.SampleInterface.HelloWorld hello
Interface 'com.example.SampleInterface' not available in object /SomeObject at com.example.SampleService:
org.freedesktop.DBus.Error.NoReply (...)

Any ideas?

-- 
Adeodato Simó                                     dato at net.com.org.es
Debian Developer                                  adeodato at debian.org
 
People are more violently opposed to fur than leather because it's safer to
harass rich women than motorcycle gangs.
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