From: Stefano Crocco <stefano.crocco@...>
Date: 2007-01-25T01:55:06+09:00
Subject: Re: ebedded: calling a C function from script.

Alle 17:00, mercoled� 24 gennaio 2007, Shea Martin ha scritto:
> Here is another one i can't find in the book or online:
>
> How do I call a global function  (which resides in a script) from C.
>
> <script>
> def script_main( args )
> 	puts "something"
> end
> </script>
>
> <cpp>
> ruby_init();
> ruby_script("embedded");
>
> init_my_ruby_stuff();
>
> rb_load_file( "test.rb" )
> ID id = rb_intern( "script_main" );
> rb_funcall( rb_cObject, id, 0 );
>
> ruby_finalize();
>
> return 0;
> <cpp/>
>
> But this crashes with an access violation when I run it... am I doing
> something wrong?
>
> ~S

Your problem is that you're calling 'script_main', which is an instance method 
of class object, as if it were a class method of Object. To do this, you 
should access the top level object. I've tried to find the correct method to 
do this, in vain. The best suggestion is this

VALUE top_level=rb_eval_string("self");
rb_funcall(self, rb_intern("script_main"),0);

As I said, there should be a better way, but this should work.

Stefano