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

[Jon Lederman]

Hi,

And here is yet another person who seems to encounter the same issue:   http://stackoverflow.com/questions/9140572/c-boost-python-2-problems

-Jon
> On Sep 8, 2016, at 6:00 PM, Stefan Seefeld <stefan at seefeld.name> wrote:
> 
> Hi Jon,
> 
> please remove the dependency on the "opus/*" headers, so we can compile
> the module ourselves and try to reproduce what you are reporting.
> (That's what I meant with "self-contained test".)
> 
> 
> Thanks,
>        Stefan
> 
> On 08.09.2016 17:30, Jon Lederman wrote:
>> 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 <stefan at 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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> 
> -- 
> 
>      ...ich hab' noch einen Koffer in Berlin...
> 
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