Object path values - which service do they belong to?

Colin Walters walters at verbum.org
Tue May 17 10:27:43 PDT 2005

On Tue, 2005-05-17 at 13:07 -0400, Havoc Pennington wrote:
> On Mon, 2005-05-16 at 17:14 -0400, Colin Walters wrote:
> > 
> > As I understand it, the intention is that object paths are service
> > local.  If you get an object path back from a service, it refers to an
> > object on that service.  If you're passing inter-service object paths,
> > I'd suggest just using DBUS_TYPE_STRING.
> > 
> You can use DBUS_TYPE_OBJECT_PATH to go between services, why not?

What I'm doing in the GLib bindings now is mapping it on the client end
to DBUS_TYPE_G_PROXY, and on the server end mapping it to G_TYPE_OBJECT.
This feels pretty natural I think, but it is based on the assumption
that an object path always refers to an object on the same service as
the method.

For example, code to retrieve a list of devices from NetworkManager and
print out whether they were wireless would look like:

DBusGProxy *networkmanager;
GError *error = NULL;
GPtrArray *devices;
guint i;

if (!org_freedesktop_NetworkManager_get_devices (nm, &error))
for (i = 0; i < devices->len; i++) {
  DBusGProxy *device;
  gboolean wireless;

  device = g_ptr_array_index (devices, i)
  if (!org_freedesktop_NetworkManager_get_wireless_enabled (device, &wireless, &error))
  if (wireless)
    printf ("device %s is wireless\n", dbus_g_proxy_get_path (device));
  /* Important: unref returned proxy */
  g_object_unref (device);
g_ptr_array_free (devices, TRUE);

And on the server end, all NetworkManager has to do is create a
GPtrArray with references to its device objects and return that.

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