Re: [Boost-users] (Boost.Python) How to print from C++ to the same stream as Python's 'print' does?

Subject: Re: [Boost-users] (Boost.Python) How to print from C++ to the same stream as Python's 'print' does?
From: Early Ehlinger (earlye_at_[hidden])
Date: 2009-05-13 07:19:20

I don't know if that helps the OP, but it's certainly an improvement over
mine!

Thanks.

-- Early

On Wed, May 13, 2009 at 3:11 AM, Christopher Currie
<christopher_at_[hidden]>wrote:

> On Mon, May 11, 2009 at 2:17 PM, Early Ehlinger <earlye_at_[hidden]> wrote:
> > Basically, you need to create a streambuf class that calls
> > PySys_WriteStdout() inside your_streambuf_class::sync().
> >> http://lists.boost.org/mailman/listinfo.cgi/boost-users
>
> It's probably fairly straightforward to do this using Boost.Iostreams,
> by creating a model of Sink:
>
> include <Python.h>
>
> #include <algorithm>                       // min
> #include <iosfwd>                          // streamsize
> #include <boost/iostreams/categories.hpp>  // sink_tag
> #include <boost/iostreams/stream.hpp>      // stream
> #include <boost/format.hpp>                // format
>
> class pysys_stdout_sink {
> public:
>    typedef char char_type;
>    typedef boost::iostreams::sink_tag category;
>
>    std::streamsize write( const char* s, std::streamsize n ) {
>        // PySys_WriteStdout truncates to 1000 chars
>        static const std::streamsize MAXSIZE = 1000;
>
>        std::streamsize written = std::min( n, MAXSIZE );
>        PySys_WriteStdout( (boost::format("%%.%1%s") %
> written).str().c_str(), s );
>
>        return written;
>    }
> };
>
> boost::iostreams::stream<pysys_stdout_sink> pysys_stdout;
>
> int main()
> {
>    Py_Initialize();
>    pysys_stdout << "Hello, Python world!\n";
> }
>
> HTH,
> Christopher
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>

-- 
Early Ehlinger