How QDeclarativeView destruction

[xman_ss]

Hi all,

I face a problem in Qt, QDeclarativeView can not delete after constructing via pointer. It throws an exception: Segmentation fault.
Could you tell me a solution

This my code:

MainWindow::MainWindow()
{
        m_pView = QDeclarativeView();                             // CONSTRUCT NEW QtDeclarativeView
        m_pView->setSource("qrc:/UI/main.qml");      
 
        setCentralWidget(m_pView);
        setFocus();
        centralWidget()->setFocus();
}
 
 
MainWindow::ChangeView()
{
 
        QDeclarativeView* pOldView = m_pView;        
 
        m_pView = QDeclarativeView();
        m_pView->setSource("qrc:/UI/main.qml");      
 
        setCentralWidget(m_pView);
        setFocus();
        centralWidget()->setFocus();    
 
        delete pOldView;                                //  DESTROY THE POINTER;  EXCEPTION HERE
}
 
main()
{
     MainWindow w;
 
     w.show();
 
     w.ChangeView();
}

MainWindow::MainWindow()
{
        m_pView = QDeclarativeView();                             // CONSTRUCT NEW QtDeclarativeView
        m_pView->setSource("qrc:/UI/main.qml");      

        setCentralWidget(m_pView);
        setFocus();
        centralWidget()->setFocus();
}


MainWindow::ChangeView()
{

        QDeclarativeView* pOldView = m_pView;        

        m_pView = QDeclarativeView();
        m_pView->setSource("qrc:/UI/main.qml");      

        setCentralWidget(m_pView);
        setFocus();
        centralWidget()->setFocus();    

        delete pOldView;                                //  DESTROY THE POINTER;  EXCEPTION HERE
}

main()
{
     MainWindow w;

     w.show();

     w.ChangeView();
}

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[viulskiez]

The source code doesn't clear because you do not use new operator to instantiate the object, but you try to destroy using delete operator.

[xman_ss]

The source code doesn't clear because you do not use new operator to instantiate the object, but you try to destroy using delete operator.

Yes, it's my mistake. The source should be:

MainWindow::MainWindow()
{
m_pView = new QDeclarativeView();    // CONSTRUCT NEW QtDeclarativeView
m_pView->setSource("qrc:/UI/main.qml");
 
setCentralWidget(m_pView);
setFocus();
centralWidget()->setFocus();
}

MainWindow::MainWindow()
{
m_pView = new QDeclarativeView();    // CONSTRUCT NEW QtDeclarativeView
m_pView->setSource("qrc:/UI/main.qml");
 
setCentralWidget(m_pView);
setFocus();
centralWidget()->setFocus();
}

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But I can't not delete QDeclarativeView* after using new operator.
It's ok to continue the program without delete, but it can lead to memory leaking. How to avoid it

[viulskiez]

Maybe the pOldView still used by another objects, so simply use QObject::deleteLater.

pOldView->deleteLater();

pOldView->deleteLater();

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