[boost] Re: Calling a python function from C++ to update a progress display widget

From: David Abrahams (dave_at_[hidden])
Date: 2005-05-09 08:58:27

"Thierry Lam" <lam_at_[hidden]> writes:

Hi Thierry,

In the future, a better place for Boost.Python questions is
http://www.boost.org/more/mailing_lists.htm#cplussig

> Let's say I have the following in a Python file called progress.py: 
>
> pbar = gtk.ProgressBar()
>
>
> def updateBar():
>
>     pbar.puls()   
>
>
> In C++:
>
>
>      // Call the python method updateBar() which is not a member of any
> class in progress.py
>
>  
>
> How do I do it?

You need to get ahold of the progress module:

    python::object progress((
        python::handle<>(
            python::borrowed(PyImport_AddModule("progress")))));

Then you can get the updateBar method:

    python::object updateBar = progress.attr("updateBar");

Then you can call that:

    updateBar();

That's the "slick, modern approach."  No need to mess around with
call<...> and friends.

-- 
Dave Abrahams
Boost Consulting
www.boost-consulting.com