[PyQt] Bug in QAbstractNativeEventFilter in PyQt 5.1.1?

[Klemetti, Antti]

Hi,

Our application subclasses QAbstractNativeEventFilter and
reimplements function QAbstractNativeEventFilter.nativeEventFilter
to catch application specific messages on Windows.
The Python version used is 3.3.2.

It seems that the PyQt implementation of QAbstractNativeEventFilter.nativeEventFilter
has a slightly modified function signature from that of Qt5 C++.
The Qt5 C++ function takes three parameters: eventType, message and result.
The PyQt version takes two parameters: eventType, message as input and
returns a tuple of bool and int, where int is the result.

The modified signature is not a problem, but there is some bug in the PyQt5 implementation.
If I return anything else than None as the result from my nativeEventFilter function,
PyQt5 implementation crashes.
If I return None, stderr gets the following error message:
"TypeError: invalid result type from WinEventFilter.nativeEventFilter()".

Here is our subclass implementation:
-----
    class WinEventFilter(QAbstractNativeEventFilter):
        def __init__(self, my_windows_message, log):
            QAbstractNativeEventFilter.__init__(self)
            self.my_windows_message = my_windows_message
            self.log = log

        def nativeEventFilter(self, eventType, message): # pylint: disable=W0613
            try:
                msg = ctypes.wintypes.MSG.from_address(message.__int__()) # pylint: disable=E1101
                if msg.message == self.my_windows_message:
                    # Handling for our special Windows message
                    pass
            except:
                self.log.exception("Exception in WinEventFilter.nativeEventFilter")
            dummy_result = None
            return False, dummy_result # False lets the event propagate freely
-----

BR, Antti