[PyQt] Problem with signal and slot arguments

[Florian Bruhin]

Hey Sietse,

On Tue, Oct 29, 2019 at 11:08:29AM +0100, s.achterop at rug.nl wrote:
>     [...]
> 
>     @pyqtSlot()
>     def addDevice(self, info):
>         if info.coreConfigurations() & QtBt.QBluetoothDeviceInfo.LowEnergyCoreConfiguration:
>             self.setUpdate(f'Last device added: {info.name}')
> 
> Running this gets me the following error:
> 
>   TypeError: addDevice() missing 1 required positional argument: 'info'
> 
> With ipython3 this seems to be a warning, with python3 the progam aborts immediately.
> 
> It seems that the slot is being called without the info argument, but signal
>   QBluetoothDeviceDiscoveryAgent().deviceDiscovered
> does have the argument.
> 
> What am I doing wrong here?

The @pyqtSlot decorator takes the types of the slot arguments, so your
@pyqtSlot() decorator means "this is a slot without any arguments".

You probably want @pyqtSlot(QBluetoothDeviceInfo) instead.

Florian

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