From: Zeng Ke <zengke@...>
Date: 2006-03-23T12:18:03+09:00
Subject: Re: C extensions question

You'd better make the Makefile using extconf.rb, in which you can 
specify the library path and include path,  as is told in the rubybook.


Jared Richardson wrote:

>Hi all,
>
>I haven't done any "real" work in C in nearly 10 years and I'm still 
>learning Ruby, so it's quite possible that I'm just doing something dumb, 
>but I'm stuck here. I'm trying to call Ingres database code from Ruby, so 
>I'm writing some C extensions.
>
>I have Ruby calling into C code. Very easy and very nice.
>
>I have Ingres sample code (which is C) compiling and running fine.
>
>However, when I try to invoke Ingres code from any of my C code and run it 
>(from Ruby), I get a seg fault.
>
>It feels like Ruby can't see the Ingres libraries but the code samples don't 
>seem to having any problems. I suspect I'm missing something simple...
>
>Do you need to do any special wrapping or declaring of code that isn't 
>touched from within your Ruby? I've been through the Pickaxe book and 
>several online samples/tutorials and I don't see that it's needed... but 
>then again, my code isn't running. :)
>
>Here's my code as it is now... any hints or clues?
>
>#include "ruby.h"
># include <stdio.h>
># include <iiapi.h>
>
>static VALUE cIngres;
>
>static VALUE ii_exec(VALUE self) {
> printf("\n\nExec was run from within the Ruby code \n\n");
>  IIAPI_INITPARM  initParm;
>  printf("one\n");
>  IIapi_initialize( &initParm );
>  printf("two\n");
> return Qnil;
>}
>
>void Init_Ingres() {
> cIngres = rb_define_class("Ingres", rb_cObject);
> rb_define_method(cIngres, "exec", ii_exec, 0);
>}
>
>
>Thanks!
>
>Jared
>http://jaredrichardson.net 
>
>
>
>
>
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