Re: [PyQt] problem with abstract classes
Giovanni Bajo schrieb: On 12/08/2007 16.20, Diez B. Roggisch wrote: Any suggestions? Am I doing something fundamentally wrong wrt implementation of C++-interfaces? Please post a minimal, complete example that reproduces your problem. Otherwise, it's a little hard to help you... I know... So I tried to come up with a smaller example. However, it's not showing the same, but another problem. Until that is fixed, I think investigating the old problem is pretty much useless. The attached project tries to model the situation I have in my real app. It compiles runs under my Mac. Essentially all I try to do is to create a interface in C++ (IEventReceiver), a subclass (PyIEventReceiver) to overload the pure virtual methods of the base-interface so it can be overloaded in python and a test-class that invokes the OnEvent-method in a previously set IEventReceiver implementation. Then in the python-test-script, I try and instantiate the test-object, and subclass the PyIEventReceiver. The latter is the problem. When passing that into the test-object and invoke the test-method, I don't get the overloaded method invoked. How do I achieve that? I'm not sure if the two problems are related - but until this works, it's moot to try and make the other problem go away. Kind regards, Diez SIPTest.tgz Description: GNU Zip compressed data ___ PyQt mailing listPyQt@riverbankcomputing.com http://www.riverbankcomputing.com/mailman/listinfo/pyqt
Re: [PyQt] problem with abstract classes
On Tuesday 14 August 2007 8:47 am, Diez B. Roggisch wrote:
Giovanni Bajo schrieb:
On 12/08/2007 16.20, Diez B. Roggisch wrote:
Any suggestions? Am I doing something fundamentally wrong wrt
implementation of C++-interfaces?
Please post a minimal, complete example that reproduces your problem.
Otherwise, it's a little hard to help you...
I know... So I tried to come up with a smaller example. However, it's
not showing the same, but another problem. Until that is fixed, I think
investigating the old problem is pretty much useless.
The attached project tries to model the situation I have in my real app.
It compiles runs under my Mac.
Essentially all I try to do is to create a interface in C++
(IEventReceiver), a subclass (PyIEventReceiver) to overload the pure
virtual methods of the base-interface so it can be overloaded in python
and a test-class that invokes the OnEvent-method in a previously set
IEventReceiver implementation.
Then in the python-test-script, I try and instantiate the test-object,
and subclass the PyIEventReceiver. The latter is the problem. When
passing that into the test-object and invoke the test-method, I don't
get the overloaded method invoked.
How do I achieve that?
I'm not sure if the two problems are related - but until this works,
it's moot to try and make the other problem go away.
Do as Jim said and make sure the declaration of IEventReceiver::OnEvent() is
the same in the .h and .sip files (see attached).
Also remove the /Abstract/ annotation (for your example at least). Including
it means that there are *other* abstract functions which I'm not going to
tell you about.
With the new .sip file I get the following output from running your test...
overloaded event: 200
overloaded event: 100
Phil
// Define the SIP wrapper to the irrlicht library
%Module siptest 0
// TODO: figure out
// if there is a way to only include that
// in the enum source
%ModuleHeaderCode
#include test.h
%End
class IEventReceiver {
public:
virtual void OnEvent(int) = 0;
};
class PyIEventReceiver : IEventReceiver {
public:
void OnEvent(int);
};
class IEventReceiverTest {
public:
void test();
void setReceiver(IEventReceiver *);
};
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Re: [PyQt] problem with abstract classes
On 14/08/2007 9.47, Diez B. Roggisch wrote: Essentially all I try to do is to create a interface in C++ (IEventReceiver), a subclass (PyIEventReceiver) to overload the pure virtual methods of the base-interface so it can be overloaded in python and a test-class that invokes the OnEvent-method in a previously set IEventReceiver implementation. You don't need PyIEventReceiver at all. You can directly subclass IEventReceiver, if that's what you want to achieve. /Abstract/ is meant to force SIP *NOT* to allow instantiations of the class. That's not what you want. Then in the python-test-script, I try and instantiate the test-object, and subclass the PyIEventReceiver. The latter is the problem. When passing that into the test-object and invoke the test-method, I don't get the overloaded method invoked. You didn't define them as virtual in the sip file... what did you expect? :) Define them as virtual (and even add the = 0 where appropriate) and you will get the right behaviour. -- Giovanni Bajo ___ PyQt mailing listPyQt@riverbankcomputing.com http://www.riverbankcomputing.com/mailman/listinfo/pyqt
Re: [PyQt] problem with abstract classes
On 12/08/2007 16.20, Diez B. Roggisch wrote: Any suggestions? Am I doing something fundamentally wrong wrt implementation of C++-interfaces? Please post a minimal, complete example that reproduces your problem. Otherwise, it's a little hard to help you... -- Giovanni Bajo ___ PyQt mailing listPyQt@riverbankcomputing.com http://www.riverbankcomputing.com/mailman/listinfo/pyqt
Re: [PyQt] problem with abstract classes
On Sunday 12 August 2007 07:20, Diez B. Roggisch wrote:
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);
};
The line for the method OnEvent should be the same in the sip file as in the h
file - sip needs to see the = 0, and it makes no sense to add that unless
the method is marked 'virtual'.
I'm not sure I follow the rest of the explanation (likely my fault), but my
guess is that sip is generating code to call a method that isn't there (a
pure virtual) - you haven't told sip the method doesn't (concretely) exist.
Jim
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: 0x0008
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/../CIrrDeviceSt
ub.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
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[PyQt] problem with abstract classes
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: 0x0008
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
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