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RE: CXX-Users Digest, Vol 10, Issue 5
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From: William N. <fir...@ho...> - 2008-12-30 10:30:40
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> From: cxx...@li... > Subject: CXX-Users Digest, Vol 10, Issue 5 > To: cxx...@li... > Date: Sun, 28 Dec 2008 12:09:36 +0000 > > Send CXX-Users mailing list submissions to > cxx...@li... > > To subscribe or unsubscribe via the World Wide Web, visit > https://lists.sourceforge.net/lists/listinfo/cxx-users > or, via email, send a message with subject or body 'help' to > cxx...@li... > > You can reach the person managing the list at > cxx...@li... > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of CXX-Users digest..." > > > Today's Topics: > > 1. Re:Python objects not deleted (Barry Scott) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Sun, 28 Dec 2008 11:00:48 +0000 > From: Barry Scott <ba...@ba...> > Subject: Re: Python objects not deleted > To: Discuss PyCXX use and improvement > <cxx...@li...> > Message-ID: <451...@ba...> > Content-Type: text/plain; charset="us-ascii" > > > On 24 Dec 2008, at 00:15, William Newbery wrote: > > > > Cannot be done. Python can only call C code that meets its API > > > specification. C++ loses on two counts its not C and its not > > python API. > > > > I think you missed what I meant. I dont want python to touch that > > stuff, I want it only for other c++ objects in the same project ie: > > > > class Direct3D : public Py::ExtensionObject<Direct3D> > > { > > ... > > Py::Object Render(const Py::Tuple &args);//--- method for use by > > python > > ... > > IDirect3DDevice9* GetDevice();//--- ONLY used by other c++ > > objects in this project, like say the sprite class that needs to do: > > "d3d->GetDevice()->DrawPrimitive(D3DPT_TRIANGLEFAN, 0, 2)" etc > > }; > > > > So basicly what I'm saying is that within the c++ code can I use the > > Direct3D* object directly, and ignore the python stuff all together > > except for maintaining the refrence count so it cant get deleted > > while its still used by c++ objects. I dont want python to even know > > about the GetDevice method and IDirect3DDevice9 interface, thats > > soley for internal use by my c++ project. > > The error you made was not letting Python handle the ref counting. Fix > that as I suggested and you will be good. > > If you have private objects that Python does not need to see manage > them in C++ way. > > Barry > > > -------------- next part -------------- > An HTML attachment was scrubbed... > > ------------------------------ > > ------------------------------------------------------------------------------ > > > ------------------------------ > > _______________________________________________ > CXX-Users mailing list > CXX...@li... > https://lists.sourceforge.net/lists/listinfo/cxx-users > > > End of CXX-Users Digest, Vol 10, Issue 5 > **************************************** Ok but how exactly do I do that since the class has both c++ and python stuff? If I pass a pointer around to the object in the c++ code then either the object will get deleted before I want (ie when theres no python stuff refrencing it anymore), or it never gets deleted it seems, and if I use the extesion object template class to hold the pointer then I cant access the c++ stuff. Is there some other class that just acts as a smart pointer, allows me to access my c++ class directly with -> but also handles the stuff python needs like refrence counting. _________________________________________________________________ Imagine a life without walls. See the possibilities. http://clk.atdmt.com/UKM/go/122465943/direct/01/ |