[PyQt] How to connect the activated signal of QWinEventNotifier to a custom slot in pyqt 5.6

[slepton at posteo.de]

Hi Phil,

thanks for the quick reply.


1. Looking at QWinEventNotifier the Signal is voidptr, right?

class QWinEventNotifier(QObject):
     """
     QWinEventNotifier(parent: QObject = None)
     QWinEventNotifier(sip.voidptr, parent: QObject = None)
     """
     def activated(self, sip_voidptr): # real signature unknown; restored 
from __doc__
         """ activated(self, sip.voidptr) [signal] """
         pass



2. Looking at the connection error

      TypeError: connect() failed between activated(Qt::HANDLE)

  I would assume,  that  voidptr is acctually  a Qt::HANDLE  
(http://doc.qt.io/qt-5.6/qt.html#HANDLE-typedef)  which I couldn't find 
in from PyQt5.QtCore import Qt , is this even the right place to look?



3. I am not sure I understand correctly what to do, so far the slot I 
connected to looked like

@pyqtSlot(int)
def event_slot(self, event):
     # do something ...

For the @pyqtSlot decorator I additionally tried @pyqtSlot() and in a 
desperate attempt @pyqtSlot(ctypes.c_int)  since this would be the 
correct type for the win32event.

  What decorator can I use to further track down the problem?


Best regards

Sebastian



Am 31.01.2017 10:39 schrieb Phil Thompson:
> On 30 Jan 2017, at 11:19 pm, slepton at posteo.de wrote:
>> 
>> Hello,
>> 
>> I am trying to use  QWinEventNotifier on PyQt 5.6 / Python 3.5 with a 
>> custom slot. My Problem is, that I can't figure out what decorator to 
>> use.
>> 
>> The relevant code snippet looks like this:
>> 
>> 
>> 
>> def register(self):
>>     # Windows event
>>     self.receive_event = win32event.CreateEvent(None, 0, 0, None)
>>     # Code to register the event with the PCAN API
>>     # ...
>>     self.PCANrevieceEventHandler = QWinEventNotifier(parent=self)
>>     
>> self.PCANrevieceEventHandler.setHandle(ctypes.c_int(self.receive_event))
>>     self.PCANrevieceEventHandler.activated.connect(self.msg_recev)
>> 
>> 
>> @pyqtSlot(  )  # I tried int, ctypes.c_int, ... nothing
>> def msg_recev(self, handle):
>>     # read the buffer
>> 
>> 
>> I get TypeError: connect() failed between activated(Qt::HANDLE) and 
>> unislot()
>> 
>> 
>> I know, that in Qt 5.8 there would be QtSerialBus to propperly handle 
>> this, looking at the Qt src, QWinEventNotifier seems to be the right 
>> thing to use...
>> 
>> What is the propper way to do this?
> 
> Try without a decorator and see what is actually passed in.
> 
> Phil