From: "Iñaki Baz Castillo" <ibc@...>
Date: 2012-05-08T07:21:21+09:00
Subject: How to use Data_Wrap_Struct to assign the DATA VALUE to an exsiting Ruby object?

Hi, my code receives an arbitrary klass name (provided by the user)
and I need to create an instance of such a klass and also wrap a C
pointer within it.

Unfortunately Data_Wrap_Struct(VALUE class, void (*mark)(), void
(*free)(), void *ptr") requires a class VALUE rather than a single
object/instance. So I expect that I *cannot* attach/wrap a C DATA
pointer into an *existing* Ruby object and, instead, I need to store
the DATA pointer within an internal attribute of the object, am I
right?

Thanks a lot.

-- 
Iñaki Baz Castillo
<ibc@aliax.net>