SWIG toy example problem

ruby-talk
1

I'm having a bit of trouble trying to use SWIG to wrap a simple C++ header
file, as follows:

'MyTest.h'

···

----------
#define SUCCESS 1
----------

'myTest.i'
----------
%include MyTest.h

%module myTest
%{
#include "MyTest.h"
%}
---------

swig -c++ -ruby myTest.i

g++ -c myTest_wrap.cxx -I/usr/lib/ruby/1.8/i386-cygwin

g++ -shared myTest_wrap.o -lruby -o myTest.so

$ irb
irb(main):001:0> require 'myTest'
=> true
irb(main):002:0> MyTest::SUCCESS
NameError: uninitialized constant MyTest::SUCCESS
        from (irb):3
        from :0
irb(main):004:0> MyTest.constants
=> []
irb(main):005:0>

--
Respectfully,
Larry Diehl
www.larrytheliquid.com

2

Hi,

somehow works for me. To check, have a look at the end of the
generated file - there should be a line saying
rb_define_const(mMyTest,"SUCCESS", INT2NUM(1));

SWIG processor by default ignores #include (to enable them use
--includeall) but this is not your case, as you used %include instead.

I'm using SWIG 1.3.27, as the newer ones converted ruby support to
unified templates, and I couldn't get our hacks to work with them yet.

Jano

···

On 3/24/07, Larrytheliquid <larrytheliquid@gmail.com> wrote:

I'm having a bit of trouble trying to use SWIG to wrap a simple C++ header
file, as follows:

'MyTest.h'
----------
#define SUCCESS 1
----------

'myTest.i'
----------
%include MyTest.h

%module myTest
%{
#include "MyTest.h"
%}
---------

swig -c++ -ruby myTest.i

g++ -c myTest_wrap.cxx -I/usr/lib/ruby/1.8/i386-cygwin

g++ -shared myTest_wrap.o -lruby -o myTest.so

$ irb
irb(main):001:0> require 'myTest'
=> true
irb(main):002:0> MyTest::SUCCESS
NameError: uninitialized constant MyTest::SUCCESS
        from (irb):3
        from :0
irb(main):004:0> MyTest.constants
=>
irb(main):005:0>

3

Hi Jano,

Good call on checking for rb_define_const... it wasn't there. I eventually
found out that the version I was using was 1.3.29, which did not seem to
work. After using 1.3.31 everything worked well.

Thanks.

···

On 3/26/07, Jano Svitok <jan.svitok@gmail.com> wrote:

On 3/24/07, Larrytheliquid <larrytheliquid@gmail.com> wrote:
> I'm having a bit of trouble trying to use SWIG to wrap a simple C++
header
> file, as follows:
>
> 'MyTest.h'
> ----------
> #define SUCCESS 1
> ----------
>
> 'myTest.i'
> ----------
> %include MyTest.h
>
> %module myTest
> %{
> #include "MyTest.h"
> %}
> ---------
>
> swig -c++ -ruby myTest.i
>
> g++ -c myTest_wrap.cxx -I/usr/lib/ruby/1.8/i386-cygwin
>
> g++ -shared myTest_wrap.o -lruby -o myTest.so
>
> $ irb
> irb(main):001:0> require 'myTest'
> => true
> irb(main):002:0> MyTest::SUCCESS
> NameError: uninitialized constant MyTest::SUCCESS
> from (irb):3
> from :0
> irb(main):004:0> MyTest.constants
> =>
> irb(main):005:0>
>

Hi,

somehow works for me. To check, have a look at the end of the
generated file - there should be a line saying
rb_define_const(mMyTest,"SUCCESS", INT2NUM(1));

SWIG processor by default ignores #include (to enable them use
--includeall) but this is not your case, as you used %include instead.

I'm using SWIG 1.3.27, as the newer ones converted ruby support to
unified templates, and I couldn't get our hacks to work with them yet.

Jano

--
Respectfully,
Larry Diehl
www.larrytheliquid.com