[C++-sig] How to use an opaque pointer ?

[Roman Yakovenko]

On Wed, Sep 24, 2008 at 9:26 PM, William Marié <william.marie at gmail.com> wrote:
>
> Hi,
>
> I would like to pass a CObject from C++ to Python without exposing the class
> i've seen the opaque pointer feature but i can't make it work.
>
> Here is what i would like to do :
>
> CObject* pObj = ..... ;
> bp::object callable = .... ;
> callable( (bpCObject*)pObj );
>
> I tried to do like in the documentation :
>
> typedef struct CObject_ *bpCObject;
> BOOST_PYTHON_OPAQUE_SPECIALIZED_TYPE_ID(CObject_)
>
> but i always have this error at runtime :
>
> TypeError: No to_python (by-value) converter found for C++ type: struct
> bpCObject *
>
> and i don't understand, could someone tell me why i have that and what do i
> have to do to fix the problem ?

You should register BOOST_PYTHON_OPAQUE_SPECIALIZED_TYPE_ID(CObject_)
in every module.

May I suggest you to try Py++? It handles such functionality pretty well.

-- 
Roman Yakovenko
C++ Python language binding
http://www.language-binding.net/