From: Shea Martin <shea@...>
Date: 2007-01-26T01:15:11+09:00
Subject: Re: ebedded: calling a C function from script.

Stefano Crocco wrote:
> 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
> 
I tried what you said:

	VALUE script_obj = rb_eval_string("self");
	ID script_main_id = rb_intern("script_main");
	rb_funcall( script_obj, script_main_id, 0 );

but it crashes with the access violation.

I also tried this:

	VALUE script_obj = rb_class_new_instance( 0, 0, rb_cObject );
	ID script_main_id = rb_intern("script_main");
	rb_funcall( script_obj, script_main_id, 0 );

and it has the same problem.

Any ideas?

~S