the gobject.Closure to which the marshaller belongs
a gobject.Value, which can store the returned string
3
a gobject.Value array holding instance, arg1 and arg2
the invocation hint given as the last argument to Closure.invoke
additional data specified when registering the marshaller
A marshaller for a gobject.CClosure with a callback of type gchar* (*callback) (gpointer instance, GObject *arg1, gpointer arg2, gpointer user_data).