From: killy-kun <killy-kun@...>
Date: 2006-03-21T03:33:50+09:00
Subject: Re: swig, c++, use string

Mark Volkmann wrote:
> On 3/20/06, killy-kun <killy-kun@wanadoo.fr> wrote:
> 
>>I would like to use the c++ string type as a parameter of function
>>return of some c++ functions used in a ruby module, made with swig.
>>
>>Here is a simple example I tried to use the string type :
>>
>>#-----------------
>>%module str
>>
>>%inline %{
>>
>>// pour tester les string
>>
>>#include <string>
>>
>>using namespace std;
>>
>>string fctBidon (string s)
>>{
>>        string res;
>>        res = s + " salt bidon";
>>        return res;
>>}
>>
>>string bidon()
>>{
>>        string res = "bouh";
>>        return res;
>>}
>>
>>%}
>>#-----------------
>>
>>But when I use it, here are the errors I get :
>>
>>#-----------------
>>[eurubyt:24] bidon
>>  ==> #<SWIG::TYPE_p_string:0xb7f080e0>
>>[eurubyt:25] bidon.class
>>  ==> SWIG::TYPE_p_string
>>[eurubyt:26] fctBidon("bb")
>>TypeError: in method 'fctBidon', argument 1 of type 'string'
>>         from (irb):26:in `fctBidon'
>>         from (irb):26
>>#-----------------
>>
>>That means the c++ string type isn't considered as the ruby String class...
>>
>>Anybody knows how I can make this work ? I would like the c++ string
>>type to be considered as the ruby String class...
> 
> 
> There's an example that does this near the end of a presentation I
> gave. You can get a PDF of the presentation at
> http://groups.yahoo.com/group/stlruby/files/. Look for the file
> RubyTools.pdf.
> 
> --
> R. Mark Volkmann
> Object Computing, Inc.
> 
> 

Thank you very much.
But the problem doesn't seem tobe resolved :/
The only thing I had to add seems to be :
%include "std_string.i"

I did so, the compilation goes well, and seems to take the file into 
account.
But the effect is still exactely the same...

I tried your example, but had the following error when running the 
main.rb file :

ruby: symbol lookup error: ./RubyPerson.so: undefined symbol: 
_ZN6PersonC1ERKSs