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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.

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

Categories : C++

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