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Warning when connecting c++ signal to qml slot


I have defined qml slot like this :

You are wrong. It is not slot definion, it's connection itself (the adding of QML handler for signal value_changed of object controllerObject). That's why you code works. But in this line :

connect(this, SIGNAL(value_changed(double)), (QObject*)ui->view->rootObject(), SLOT(onValue_changed(double)));

You are trying to connect existing signal value_changed to inexisting onValue_changed (obviously, it exists in your code, but not in rootObject of view). That's why you got warning.

Conclusion:
You tried to connect signal twice, but only one method was successful, so code worked well.


Categories : C++

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