From: Simon Krahnke <overlord@...>
Date: 2008-04-24T21:35:04+09:00
Subject: Re: Calling C functions from Embedded Ruby Interpreter

* Mohit Sindhwani <mo_mail@onghu.com> (13:06) schrieb:

> I know the subject line is quite a mouthful!  Sorry about that.

I don't see anything wrong in the subject line.

> I've managed to embed a Ruby interpreter into my application and I can 
> call Ruby functions from the code in my application.  It works fine and 
> returns results to me as expected.  I can also ask it to run a script 
> for me.

Grats.

> set_default_color(0x00ff0000)
> set_screen_size(800,600)
> ..and so on.
>
> Now, as I understand it, in my application, I need to these C functions 
> in it:
> VALUE set_default_color (VALUE color)
> VALUE set_screen_size (VALUE w, VALUE h)
> .. and so on.
>
> I just don't know what to do next!

Well, the Pickaxe has a chapter on this stuff.

Try

rb_define_global_function("set_default_color", &set_default_color, 1)

There also is rb_define_module_function(VALUE model, char *name,
VALUE(*func)(), int argc) and rb_define_singleton_method taking the same
arguments. I never tried any of these, and don't quit know how to tell a
module function from a singleton function from a system function. (The
last one is in Kernel, the other two can be in any module or class.)

mfg,                       simon .... l