From: Michael Hale <michael@...>
Date: 2004-08-18T05:42:59+09:00
Subject: Re: c extension troubles on windows

I recently resurrected my code to try to get it working again.  So far 
I have had no success.

Basically what I have got is a VC++ compiled .exe that works and a ruby 
extension that does not.  They both try to make the same library calls. 
  Here is the code.

Test.exe (standalone exe that works correctly):
====================================================================
#include <stdio.h>
#include "et1000.h"

int main() {
     char version[9];

	printf("NSUnLink Result: %d\n\n", NSUnLink());

	printf("before\n");
	printf("NSSocketLink Result: %d\n", NSSocketLink("192.168.1.244", 
16385, 0));
	printf("after\n\n");

	printf("ETGetHardwareVersion Result: %d\n", 
ETGetHardwareVersion(version));
	printf("%s\n\n", version);

	printf("NSUnLink Result: %d\n", NSUnLink());

	return 0;
}
====================================================================

Which Produces:
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
NSUnLink Result: -2

before
NSSocketLink Result: 1
after

ETGetHardwareVersion Result: 0
SMB-6000

NSUnLink Result: 0

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

smartlib_wrap.c (c extension source):
====================================================================
#include "ruby.h"
#include "et1000.h"
#include <stdio.h>

static VALUE
_wrap_NSSocketLink(int argc, VALUE *argv, VALUE self) {
     char *arg1 ;
     int arg2 ;
     int arg3 ;
     int result;
     VALUE vresult = Qnil;

     if ((argc < 3) || (argc > 3))
     rb_raise(rb_eArgError, "wrong # of arguments(%d for 3)",argc);
     arg1 = StringValuePtr(argv[0]);
     arg2 = NUM2INT(argv[1]);
     arg3 = NUM2INT(argv[2]);
	printf("before\n");
     result = (int)NSSocketLink(arg1,arg2,arg3);
	printf("after\n");

     vresult = INT2NUM(result);
     return vresult;
}

static VALUE
_wrap_NSUnLink(int argc, VALUE *argv, VALUE self) {
     int result;
     VALUE vresult = Qnil;

     if ((argc < 0) || (argc > 0))
     rb_raise(rb_eArgError, "wrong # of arguments(%d for 0)",argc);
     result = (int)NSUnLink();

     vresult = INT2NUM(result);
     return vresult;
}

static VALUE
_wrap_ETGetHardwareVersion(int argc, VALUE *argv, VALUE self) {
     char *arg1 ;
     int result;
     VALUE vresult = Qnil;

     if ((argc < 1) || (argc > 1))
     rb_raise(rb_eArgError, "wrong # of arguments(%d for 1)",argc);
     arg1 = StringValuePtr(argv[0]);
     result = (int)ETGetHardwareVersion(arg1);

     vresult = INT2NUM(result);
     return vresult;
}

VALUE mSmartlib;
void Init_smartlib(void) {
	mSmartlib = rb_define_module("Smartlib");
	rb_define_module_function(mSmartlib, "NSSocketLink", 
_wrap_NSSocketLink, -1);
	rb_define_module_function(mSmartlib, "NSUnLink", _wrap_NSUnLink, -1);
	rb_define_module_function(mSmartlib, "ETGetHardwareVersion", 
_wrap_ETGetHardwareVersion, -1);
}
====================================================================

test.rb (ruby file that uses c extension):
====================================================================
require 'smartlib'

include Smartlib

p NSUnLink()

p NSSocketLink("192.168.1.244", 16385, 0)

version = '        '
p ETGetHardwareVersion(version)
p version

p NSUnLink()
====================================================================


Which produces the following and hangs during the call to NSSocketLink 
(notice it never prints out "after").
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
-2
before

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

Any ideas?  I am particuarly puzzled by the fact that the standalone C 
version works without a hitch, but the ruby extension version of my 
code hangs.

Thanks, Michael

On Jan 14, 2004, at 3:14 PM, Michael Hale wrote:

> Unfortunately I don't have the source for the windows version of the 
> library I am using, so I can't say what the code looks like.
>
> I did create a simple C program that I compiled into a command line 
> .exe in MSVC, which works fine.  Here is the pseudo code:
> 	connect
> 	get_hardware_version
> 	disconnect
>
> However, I still run into problems when trying to use ruby to 
> interface to my library on windows.
> I am beginning to think that this could be a bug in ruby.
>
> On Dec 5, 2003, at 1:01 AM, Jon A. Lambert wrote:
>
>> Do you call ioctlsocket() to set the socket to non-blocking?
>
>
>
>
  "OS X: because it was easier to make UNIX user-friendly than to fix 
Windows"