From: Cooper Stevenson <cooper@...>
Date: 2006-08-07T07:05:13+09:00
Subject: Re: Ruby Newbie: Simple C Wrappers?

 > If so, write a small wrapper like
 >
 > VALUE rb_main(VALUE self, VALUE args)
[snip]

Thanks, Simon. I'm working on this now!

I'm trying to run this C application and capture the user's input and 
output to a Ruby string array. This way, I can use the values via Ruby 
on Rails to display content based on what's going on with the C application.

Thanks again!


-Cooper

Simon Kr�ger wrote:
> Cooper Stevenson wrote:
>> Hello,
>>
>> ...
>> I would like to interface what seems to be a straightforward main
>> program (as I understand it that's all I need to interface, not the rest
>> of the .c files, please correct me if this is in error) and have
>> achieved a compile with an empty Init function like so:
>>
>>    void
>>    Init_jzipr()
>>    {
>>
>>    }
>>
>> irb works:
>>
>>   $ irb
>>   irb(main):001:0> require 'jzipr'
>>   => true
>>
>> I am finding the next step--creating the class--difficult. Here's
>> jzip.c--it's doesn't look like much but doing it for the first time...
> 
> What are you trying to achieve?
> Do you want to start the main function from ruby?
> (I don't see the benefit here, just shell out to the program)
> 
> If so, write a small wrapper like
> 
> VALUE rb_main(VALUE self, VALUE args)
> {
> // you could/should use args here to build up a C array with parameters
>   main(0, 0);
>   return self;
> }
> 
> and call rb_define_method in your Init_jzipr to make that method available
> in ruby.
> 
> void
> Init_jzipr()
> {
>   rb_define_method(rb_cObject, "main", rb_main, -2)
> }
> 
> cheers
> 
> Simon
>