From: Vincent Fourmond <vincent.fourmond@9online.fr>
Date: 2006-09-21T03:37:49+09:00
Subject: Re: Creating a reference to a ruby variable in a C extension.


  Hello !

> Then later on I wan't to use it like this:
> 
> void call(void)
> {
>   rb_funcall(ref, rb_intern("some_method"), 0, 0);
> }

  How comes this function has no parameters ? Is it being called from
ruby, or only from C code ?

  I tend to think that using global variables is not a really good idea.
 We need a bit more context about what you want to do. Is it a class ?
Will it have several instances ?

  In the latter case, have a look at rb_iv_get and rb_iv_set to get/set
instance variables of a class instance, something like

  rb_iv_set(self, rb_intern("@variable"), arg); /* in init(...) */

  and


rb_funcall(rb_iv_get(self,rb_intern("@variable")),rb_intern("some_method"),
0, 0); /* in call */

  Don't forget as well that every single C function that can be called
directly from ruby should probably have at least one VALUE parameter and
*must* return a VALUE.

  Cheers !

	Vince