On Sun, 20 Sep 2015 13:10:37 -0400, Nicolas Jäger wrote: > Hi Christof, > >> Well yes, sure - the string constructor (that converts from a const >> char *) is complaining about the null pointer. >> >> > have you try to do : >> > >> > Glib::ustring sender; >> > >> > ...->signal_subscribe( ..., sender, ... ); >> > >> > >> > or just let the paramater not set, >> > >> > ...->signal_subscribe( ..., , ... ); >> >> but both of these options would map to empty strings (and therefore >> don't work). > did you try ? I can't try, I'm working on something... if that don't work, I > have no idea...
Yes, I did try and I then get an assertion because sender wasn't NULL GLib-GIO-CRITICAL **: g_dbus_connection_signal_subscribe: assertion 'sender == NULL || (g_dbus_is_name (sender) && (connection->flags & G_DBUS_CONNECTION_FLAGS_MESSAGE_BUS_CONNECTION))' failed >> Looking at >> https://developer.gnome.org/gio/unstable/GDBusConnection.html#g-dbus-connection-signal-subscribe >> it should map to a NULL pointer in the C interface, but that doesn't >> seem to be possible. > > your link point to the unstable doc, are you doing C++ or C ? gtkmm page is : > https://developer.gnome.org/glibmm/stable/classGio_1_1DBus_1_1Connection.html#af981fb48982bce9d4a27f70127df1cb5 > > you can just compare C API and C++ API. I am doing C++, but that function in the C++ API is obviously based on the C API function... Well, the implementation is: return g_dbus_connection_signal_subscribe(gobj(), sender.c_str(), interface_name.c_str(), member.c_str(), object_path.c_str(), arg0.c_str(), static_cast<GDBusSignalFlags>(flags), &DBusConnection_Signal_giomm_callback, slot_copy, &DBusConnection_Signal_giomm_callback_destroy); And, of course, the documentation of the C++ API is also based on the documentation of the C API (except that NULL has been replaced with 0). But the problem is that sender.c_str() can never be NULL (but that's what I would need to achieve). Christof -- http://cmeerw.org sip:cmeerw at cmeerw.org mailto:cmeerw at cmeerw.org xmpp:cmeerw at cmeerw.org _______________________________________________ gtkmm-list mailing list [email protected] https://mail.gnome.org/mailman/listinfo/gtkmm-list
