Re: [C++-sig] Boost Python Question - Multiple Classes and Modules not appearing as attribute

[Jon Lederman]

Hi,

Thanks for responding.  Here is my header file.  I am compiling this to a 
shared object called opus_strategy.so.  If I set the argument of 
BOOST_PYTHON_MODULE to opus_encoder_strategy, and compile my .so file to have 
the name opus_encoder_strategy.so,I can load the boost python module into my 
python interpreter and see the OpusEncoderStrategy class as an attribute.  

However, if I choose other names such as opus_strategy for the argument to 
BOOST_PYTHON_MODULE, when I load the boost python object it doesn’t appear to 
have any recognized attributes.  I don’t understand why the name should matter. 
 As I had noted in my previous email, I would like to have a shared object file 
with the name opus_strategy.so that encompasses a set of classes.  Just can’t 
figure out how to get it to work.  I am on OS X, BTW if that matters.   

Any help would be greatly appreciated.

Thanks.

-Jon
#ifndef OPUS_ENCODER_STRATEGY_H_
#define OPUS_ENCODER_STRATEGY_H_





#include "memory"
#include "opus/opus.h"
#include "opus/opus_defines.h"
#include "opus/opus_multistream.h"
#include "opus/opus_types.h"

#include <boost/python.hpp>
#include <boost/numpy.hpp>
#include <exception>
#include <memory>
#include <map>
#include <vector>
#include <iostream>

namespace bp = boost::python;
namespace np = boost::numpy;

using namespace std;


class OpusEncoderStrategy {

public:

        OpusEncoderStrategy(const int sample_rate, const int number_channels, 
const int opus_application);
        ~OpusEncoderStrategy();

        opus_int32 encode(const float* pcm, const int frame_size, const 
unsigned char* data,  opus_int32 max_data_bytes);

        bool setComplexity(const int c);
        int getComplexity();


private:

        bool encoderCtl();
        int getPacketDurationBytes();

        

        OpusEncoder* encoder;

        int fs;
        int channels;
        int application;
        int error;


};


BOOST_PYTHON_MODULE(opus_strategy)
{
        using namespace boost::python;


        class_<OpusEncoderStrategy>("OpusEncoderStrategy", init<const int, 
const int, const int>())
        .def("setComplexity", &OpusEncoderStrategy::setComplexity)
        .def("getComplexity", &OpusEncoderStrategy::getComplexity);
}


#endif
> On Sep 8, 2016, at 4:47 PM, Stefan Seefeld <ste...@seefeld.name> wrote:
> 
> Hi Jon,
> 
> what you are describing makes perfect sense, and should work without
> problem. From your description it isn't clear why this isn't working, so
> I suggest you put together a self-contained test that doesn't work as
> you expect, and send that out so we can have a look. Otherwise we'd have
> to guess.
> The online docs at http://boostorg.github.io/python/doc/html/index.html
> should contain everything you need.
> 
>        Stefan
> 
> -- 
> 
>      ...ich hab' noch einen Koffer in Berlin...
> 
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