a GType supporting GInitable.
the name of the first property, followed by the value, and other property value pairs, and ended by NULL.
The var args list generated from first_property_name.
optional GCancellable object, NULL to ignore.
a newly allocated GObject, or NULL on error. [type GObject.Object][transfer full]
GException on failure.
Helper function for constructing GInitable object. This is similar to g_object_new_valist() but also initializes the object and returns NULL, setting an error on failure. Since 2.22