Hi,
I'm in the process of wrapping the irrlicht 3d engine. So far, things
have been working smoothly. However, now I stumbled over a problem that
so far has not been willing to be disappearing, intensive gdb-use
notwithstanding.
There is a pure abstract class in Irrlicht, IEventReceiver. It looks
like this:
//! Interface of an object which can receive events.
class IEventReceiver
{
public:
virtual ~IEventReceiver() {};
//! called if an event happened. returns true if event was processed
virtual bool OnEvent(SEvent event) = 0;
};
This class I wrapped in SIP this way:
class IEventReceiver /Abstract/ {
%TypeHeaderCode
#include <IEventReceiver.h>
%End
public:
bool OnEvent(irr::SEvent event);
};
Which seems to work fine. Now of course I'm having troubles subclassing
this class in Python, which is the reason I created a dummy-implemntation
namespace irr {
class PyIEventReceiver : public IEventReceiver {
public:
virtual ~PyIEventReceiver();
bool OnEvent(SEvent event);
};
};
It is declared in my SIP-file as this:
class PyIEventReceiver : irr::IEventReceiver {
public:
bool OnEvent(irr::SEvent event);
};
I can subclass this class in python, and my SEvent-marshalling-code
works fine as well, as the following test-script shows:
class MyER(irrlicht.irr.PyIEventReceiver):
def OnEvent(self, event):
print event
er = MyER()
event = (irrlicht.irr.EET_MOUSE_INPUT_EVENT, 100, 100, .5, 1)
er.OnEvent(event)
But now if I set this IEventReceiver to my IrrlichtDevice, I get the
following error (inside GDB):
Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: KERN_PROTECTION_FAILURE at address: 0x00000008
0x0297119f in irr::CIrrDeviceStub::postEventFromUser (this=0x141a8f0,
event={EventType = EET_MOUSE_INPUT_EVENT, {GUIEvent = {Caller = 0x145,
EventType = 247}, MouseInput = {X = 325, Y = 247, Wheel = 0, Event =
EMIE_MOUSE_MOVED}, KeyInput = {Char = 325, Key = KEY_CRSEL, PressedDown
= false, Shift = false, Control = false}, LogEvent = {Text = 0x145
<Address 0x145 out of bounds>, Level = 247}, UserEvent = {UserData1 =
325, UserData2 = 247, UserData3 = 0}}}) at
/Users/deets/Download/irrlicht-1.3.1/source/Irrlicht/MacOSX/../CIrrDeviceStub.cpp:164
164 absorbed = UserReceiver->OnEvent(event);
(gdb) p UserReceiver
warning: RTTI symbol not found for class 'irr::NSOpenGLViewDeviceDelegate'
$1 = (IEventReceiver *) 0x1492ec0
Current language: auto; currently c++
UserReceiver here is a pointer to a IEventReceiver, which seems to be
correctly set. I tried stepping into the code, but wasn't able to.
This is with OSX 10.4, Python2.5, latest stable sip (4.7).
Any suggestions? Am I doing something fundamentally wrong wrt
implementation of C++-interfaces?
Kind regards,
Diez