From: Jared Richardson <jaredRMV-richaTHSrdson@...>
Date: 2006-03-23T21:48:54+09:00
Subject: Re: C extensions question

My original code was written just like that but I cut it down for the 
newsgroup posting. :)

Thanks!


"Gerardo Santana G�mez Garrido" <gerardo.santana@gmail.com> wrote in message 
news:b06e22130603222235r5db97687l@mail.gmail.com...
Hello Jared.

I'm not familiar with Ingres, but according to

http://www.ingres.com/download/oapi.pdf

and this

http://www.rubycentral.com/book/ext_ruby.html

I'd write it this way:

-------------- >8 --------------
#include "ruby.h"
#include <iiapi.h>

static VALUE rb_cIngres;

static void
ingres_free(void *p)
{
IIAPI_RELENVPARM relEnvParm;
IIAPI_TERMPARM termParm;

relEnvParm.re_envHandle = p;
IIapi_releaseEnv(&relEnvParm);
/* test return status */
IIapi_terminate(&termParm);
/* test return status */
}

static VALUE
ingres_alloc(VALUE klass)
{
IIAPI_INITPARM  initParm;
/*
* initialize initParm structure here
* before passing it along to IIapi_initialize
*/
IIapi_initialize(&initParm);
if (initParm.in_status != IIAPI_ST_SUCCESS) {
initParm.in_envHandle = NULL;
/* do something else probably */
}
return Data_Wrap_Struct(klass, 0, ingres_free, initParm.in_envHandle);
}

static VALUE
ingres_init(VALUE self)
{
/* Initialization stuff */
return self;
}

void Init_ingres(void) {
rb_cIngres = rb_define_class("Ingres", rb_cObject);
rb_define_method(rb_cIngres, "initialize", ingres_init, 0);
}
-------------- 8< --------------


But I can't test it.

2006/3/22, Jared Richardson <jaredRMV-richaTHSrdson@nc.rr.com>:
> 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
>
>
>
>


--
Gerardo Santana
"Between individuals, as between nations, respect for the rights of
others is peace" - Don Benito Ju�rez
http://santanatechnotes.blogspot.com/