Gets the GTypes included in @formats.
Note that @formats may not contain any #GTypes, in particular when they are empty. In that case %NULL will be returned.
%G_TYPE_INVALID-terminated array of types included in @formats or %NULL if none.
See Implementation
Gets the GTypes included in @formats.
Note that @formats may not contain any #GTypes, in particular when they are empty. In that case %NULL will be returned.