The function toStdString() is only available when QT was
compiled with STL support. The configure script does
not check STL support and might build the QT examples
even if toStdString() is not available.
Fix this, by not using the function.
https://bugzilla.gnome.org/show_bug.cgi?id=727608
Signed-off-by: Thomas Haller <thaller@redhat.com>
- the first uses dbus-glib and D-Bus "NameOwnerChanged" signal directly
- the second uses GIO's g_bus_watch_name()
- the third uses Qt and QDBusServiceWatcher class