Gio::DBus::NodeInfo::lookup_interface(): Add a method overload with no name.

* gio/src/dbusintrospection.[hg|ccg]: Add a lookup_interface() method overload
that just returns the first interface, avoiding the need to specify the name
when there is only one interface. The C API will not do this itself:
See bug #646417.
* examples/dbus/peer.cc:
* examples/dbus/server.cc:
* examples/dbus/session_bus_service.cc: Use the new method to simplify the
code slightly.

1 files changed, 28 insertions, 0 deletions

diff --git a/gio/src/dbusintrospection.ccg b/gio/src/dbusintrospection.ccg
index 4ea7e166..77638e39 100644
--- a/gio/src/dbusintrospection.ccg
+++ b/gio/src/dbusintrospection.ccg
@@ -20,4 +20,32 @@
 namespace Gio
 {
 
+namespace DBus
+{
+
+//We hand-code this because g_dbus_node_info_lookup_interface() doesn't 
+//do this when it takes a NULL.
+//See bug https://bugzilla.gnome.org/show_bug.cgi?id=646417
+Glib::RefPtr<InterfaceInfo> NodeInfo::lookup_interface()
+{
+  Glib::RefPtr<InterfaceInfo> retvalue;
+  
+  if(!gobj() || !(gobj()->interfaces))
+    return retvalue;
+
+  retvalue = Glib::wrap(gobj()->interfaces[0]);
+  
+  if(retvalue)
+    retvalue->reference(); //The function does not do a ref for us.
+
+  return retvalue;
+}
+
+Glib::RefPtr<const InterfaceInfo> NodeInfo::lookup_interface() const
+{
+  return const_cast<NodeInfo*>(this)->lookup_interface();
+}
+ 
+} //namespace DBus
+ 
 } // namespace Gio