Re: Python objects not deleted

[Barry S. <ba...@ba...>]

On 15 Dec 2008, at 20:58, William Newbery wrote:

> For some reason the python extension object is not deleted when  
> finished with.

It is python that causes the delete when the ref count hits zero.
You are bypassing python when you modify ob_refcnt.

For the automatic ref count handling you have to put your C++ objects  
into a Py::Object.

Look at Demo/rangetest.cpp for examples of using Py::ExtensionObject.


>
>
>     //clear up finished sounds
>     for(std::vector<SourceVoice*>::iterator it=finished.begin();it! 
> =finished.end();++it)
>     {
>         playing.erase(*it);
>         (*it)->ob_refcnt--;//remove the refrence we added when we  
> got the voice

Must not touch the ref cnt it is only to be done by python code via  
its API or via PyCXX that uses the python API.


>
>         std::cout << "finished voice refrence: " << (*it)->ob_refcnt  
> << std::endl; //prints 0
>     }
>
> class SourceVoice : public Py::PythonExtension<SourceVoice>
> {
>     IXAudio2SourceVoice *voice;
>     Sound *sound;

Use:

	Py::ExtensionObject<Sound> sound;


> public:
>     static void init_type();
>     SourceVoice(IXAudio2SourceVoice *voice, Sound *sound);
>     virtual ~SourceVoice();
>
>     IXAudio2SourceVoice *GetVoice(){return voice;}
> private:
>     Py::Object GetVolume(const Py::Tuple &args);
>     Py::Object SetVolume(const Py::Tuple &args);
>     Py::Object Stop     (const Py::Tuple &args);
>     Py::Object ExitLoop (const Py::Tuple &args);
> };
>
> SourceVoice::SourceVoice(IXAudio2SourceVoice *_voice, Sound *_sound)
> :voice(_voice), sound(_sound)
> {
>     sound->ob_refcnt++;

Need to pass in a Py::Object for _sound.



> }
> SourceVoice::~SourceVoice()//not called
> {
>     std::cout << "voice destroyed" << std::endl;
>     sound->ob_refcnt--;

when Py::ExtensionObject d'tor is called it will drop the ref cnt for  
you.

>
>     voice->DestroyVoice();
> }
>
> Is there some reason why an object is not deleted even when the  
> refcnt hits zero, in fact the objects are not even getting deleted  
> when the python program ends, leaving windows to clear up 100's of  
> MB's of sound data...

Barry