From: Alan Moyer <moyer4@...>
Date: 2002-01-02T04:04:48+09:00
Subject: [ruby-talk:29979] Extending Ruby on Windows (New Post)

This is actually a continuation of the thread I stared on 12/28. I tightened
up the problem I'm having so thought a new thread was in order.

Problem: Not able to create a Ruby extension using mswin32 build of Ruby and
MS VC++.

I downloaded and installed the mswin32 binaries build of Ruby. The version I
installed is 1.6.6. (From
http://www.ruby-lang.org/~usa/mswin32/ruby-1.6.6-i586-mswin32.zip) I've been
trying to learn how to wrote a Ruby extension and build it using MS VC++.
I'm using version 6 of that program. I typed in the Test class extension
that appears in the Programming Ruby book on page 173. I then created a DLL
library. The project file I used had default settings. I linked with the
library mswin32-ruby16.lib. The DLL built without error and I got the
exported function Init_Test. The C language source code follows with some
extra stuff I put in to debug:

-----------------------------------------------------------------------
#include "ruby.h"
#include <stdio.h>

__declspec(dllexport) void Init_Test(void);

static VALUE t_init(VALUE self)
{
  VALUE arr;
  arr = rb_ary_new();
  rb_iv_set(self, "@arr", arr);
  return self;
}

static VALUE t_add(VALUE self, VALUE anObject)
{
  VALUE arr;

  arr = rb_iv_get(self, "@arr");
  rb_ary_push(arr, anObject);
  return arr;
}

VALUE cTest;

void write(char* pStr);

__declspec(dllexport) void Init_Test(void) {
 write("At A");
 cTest = rb_define_class("Test", rb_cObject);
 write("At B");
 rb_define_method(cTest, "initialize", t_init, 0);
 write("At C");
 rb_define_method(cTest, "add", t_add, 1);
 write("At D");
}

/* For debugging */
void write(char* pStr) {
 FILE *fp = fopen("test.log", "a");
 fprintf(fp, pStr);
 fprintf(fp, "\n");
 fclose(fp);
}
-----------------------------------------------------------------------

I then wrote the following Ruby program:

-------------------------------------------------------------------------
require '/ruby_ms/test/Release/Test'
-------------------------------------------------------------------------

where that's the location of the built DLL. When I try to run this program I
get the following error:

D:\Ruby_ms\alan>ruby test.rb
test.rb:1: [BUG] Segmentation fault
ruby 1.6.6 (2001-12-26) [i586-mswin32]

From the debug output I see that the seg fault occurres within the call to
define_class. (Execution got to "A" but not to "B".)

What I've attempted seems about as basic as it gets. Am I doing something
wrong or is there actually a bug in the Ruby build?

I'd sure like to get beyond this point and will really appreciate your help.

Thanks so much,

Al