Finishes the async construction for the various g_async_initable_new calls, returning the created object or %NULL on error.
the #GAsyncResult from the callback
a newly created #GObject, or %NULL on error. Free with g_object_unref().
GException on failure.
2.22
See Implementation
Finishes the async construction for the various g_async_initable_new calls, returning the created object or %NULL on error.