From: Mohit Sindhwani <mo_mail@...>
Date: 2008-04-27T21:06:24+09:00
Subject: Re: Calling C functions from Embedded Ruby Interpreter

Hi Simon

First, my apologies on the late response.  Thanks for your email 
relating to my request.

Simon Krahnke wrote:
> * 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.
>   
Haha, thanks for that!

>> 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.)
>
>   

Ya, actually wisdom strikes soon after one requests for help.  I did 
find the necessary stuff in one of the links that I had been staring at 
for a while... and after that, it was easy enough to connect up the dots 
to get things moving.

Thanks for the example.  I followed the procedure for defining a module 
and then creating the functions within it.  Not sure if I eventually 
want it to be that way but I know enough now to keep exploring.

> mfg,                       simon .... l
>   

Might I ask what "mfg" stands for?

Thanks again.

Cheers,
Mohit.
4/27/2008 | 7:53 PM.