QT for MacOS : QAbstractNativeEventFilter usb changes

inogeni

Hello everyone,
I try to use the QAbstractNativeEventFilter class to handle connections/disconnections of an usb device on a Mac .
i followed the example in the documentation , but so far, i am unable to receive notifications when a device is connected or disconnected , only some mouse related events.

i've already used this class for a windows implementation, and i had no problem, but on mac no success at all.

here is what i have so far:

class MyClassForEventFilters : public QAbstractNativeEventFilter {
 public:
   bool nativeEventFilter(const QByteArray &eventType, void *message, qintptr *){
      if (eventType == "mac_generic_NSEvent"){
         qDebug() << "received event...";
         return true;
      }
     return false;
  }
};

int main(int argc, char* argv[]){
   QGuiApplication app(argc, argv);

// some code related to the QQmlApplicationEngine...

   MyClassForEventFilters filters;
   app.installNativeEventFilter(&filters);
   return app.exec();
}

could you explain what i'm doing wrong or missing on MacOS, please ?

thank you in advance for any help

SGaist

Hi and welcome to devnet,

That is speculation but I think you have to do some setup in order for your application to receive USB related events. This might be a starting point.

inogeni

Hi,

Based on the link you provided, it seems i don't even need the QAbstractNativeEventFilter, as with the IOKit i can have the connection/disconnection events already .

i will go with that from here .

Thank you for your help !

IPlayGenji6

@inogeni How do I change it if I want to use it on windows?