SWIG toy example problem

Ruby
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>

2

On 3/24/07, Larrytheliquid [email protected] wrote:

%include MyTest.h

=> []
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

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.