QPointer might help you to control QObject's lifetime On Fri, Feb 9, 2018 at 6:38 PM, Alexander Ivash <elder...@gmail.com> wrote:
> Hi, > > There is a code like the following: > > QVariant objectNameVariant = item->property( "objectName" ); > QString objectNameString = objectNameVariant.toString(); > qDebug () << "objectNameString: " << objectNameString; > > QVariant keyboardEnabledVariant = item->property( "keyboardEnabled" ); > bool keyboardEnabled = keyboardEnabledVariant.toBool(); > qDebug () << "keyboardEnabled: " << keyboardEnabled; > > QVariant keyboardRaisedVariant = item->property( "keyboardRaised" ); > bool keyboardRaised = keyboardRaisedVariant.toBool(); > qDebug () << "keyboardRaised: " << keyboardRaised; > > .. and I'm investigating occasional crashes on the line "QVariant > keyboardRaisedVariant = item->property( "keyboardRaised" );" > > The first crash was confronted under the Linux/Qt 5.9.1 but it is also > reproducible on both Windows and Linux with Qt 5.10 (although not 100% of > time). > > Based on what I see in DEBUG it happens because of null 'engine' inside > QQmlNotifierEndpoint::connect. But under what conditions engine could > become null? > > The only idea I have at the moment is that 'item' gets garbage-collected > by the time of querying 'keyboardRaised' but I'm not sure how to prove it. > What other possible theories makes sense to check? > > Regards, Alexander > > _______________________________________________ > Interest mailing list > Interest@qt-project.org > http://lists.qt-project.org/mailman/listinfo/interest > > -- Best regards, Vlad
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