[C++-sig] [Swig-user] Why this does not work- overriding C++ virtual functions in python script?

[Nitro]

Am 08.05.2007, 14:20 Uhr, schrieb Bruce Who <bruce.who.hk at gmail.com>:

> Hi, all
>
> I have managed to get a python wrapper for my Cpp modules, but there
> is something wrong.
>
> This is my cpp files:
>
> // cmod.h file
> #ifndef __CMOD_H
> #define __CMOD_H
>
> class EventHandler
> {
> public:
>     virtual void OnEvent(){}
>     virtual ~EventHandler(){}
> };
>
> void func(void);
>
> void setEventHandler(EventHandler* pEH);
>
> #endif
>
> // cmod.cpp file
> #include "cmod.h"
>
> static EventHandler* s_pEH;
>
> void func(void)
> {
>     if(s_pEH != NULL)
>     {
>         printf("call OnEvent");
>         s_pEH->OnEvent();
>     }
> }
>
> void setEventHandler(EventHandler* pEH)
> {
>     s_pEH = pEH;
> }
>
> // cmod.i file
> %module cmod
> %include "cmod.h"
>
>
> %inline %{
> #include "cmod.h"
>
> %}
>
>
> and I compile all these files with Visual Studio 2005:
>
> swig -c++ -python cmod.i
> cl -c cmod_wrap.cxx -ID:\program\Python25\include\
> cl -c cmod.cpp
> link /subsystem:windows /LIBPATH:D:\program\Python25\libs\
> cmod_wrap.obj cmod.obj /dll /OUT:_cmod.pyd
>
> and then we can get cmod.py and _cmod.pyd. I write a python script:
>
> # testcmod.py file
> import cmod
>
> class EventHandler(cmod.EventHandler):
>     def OnEvent(self):
>         print 'called'
>
> eh = EventHandler()
> cmod.setEventHandler(eh)
> cmod.func()
>
>
> Once this script runs, it is supposed to print 'called' but it does
> not! I guess that if we cannot override C++ virtual functions in
> python script? Hope someone can help me. Any help would be
> appreciated!

Read the "directors" part of the manual.

-Matthias