From: Shashank Date <sdate@...>
Date: 2003-06-25T13:34:50+09:00
Subject: help needed: extending ruby

I'm trying out the following example from
the book "Making use of Ruby" (page 200,201):

#----- tst_simple.rb ------------
    require 'simple'

    s = Simple.new(123)

    p s.i
    p s.a

    s.i = 456
    s.a.push("Hello")
    s.a.push("World")

    p s.a
#-----------------------------

where the class Simple is defined using the C extension shown below.
I compiled it using VC++ 6.0 on Win XP Pro and got no warning or errors.
Then I copied the resulting "simple.dll" in C:\ruby\lib\ruby\site_ruby.

But when I ran the ruby code I get:

C:/ruby/lib/ruby/site_ruby/simple.dll: 126: The specified module could not
be found.   - C:/ruby/lib/ruby/site_ruby/simple.dll (LoadError)
 from C:/atest/tst_simple.rb:1

What am I missing ?

//---------------------------------------------------------------------
#include <ruby.h>

static VALUE simple_initialize(VALUE self, int iValue)
{
 rb_iv_set(self,"@i",iValue);
 rb_iv_set(self,"@a",rb_ary_new());
 return self;
}

static VALUE simple_get_i(VALUE self)
{
 return rb_iv_get(self,"@i");
}

static VALUE simple_set_i(VALUE self, int iValue)
{
 return rb_iv_set(self,"@i",iValue);
}

static VALUE simple_get_a(VALUE self)
{
 return rb_iv_get(self,"@a");
}

void Init_Simple()
{
 VALUE cSimple;

 cSimple = rb_define_class("Simple",rb_cObject);
 rb_define_method(cSimple,"initialize",simple_initialize,1);

 rb_define_method(cSimple,"i",  simple_get_i, 0);
 rb_define_method(cSimple,"i=", simple_set_i, 1);
 rb_define_method(cSimple,"a",  simple_get_a, 0);
}

//---------------------------------------------------------------------

Please help. Thanks,
-- shanko