A simple indeed treeview does not display anything upon a correct QFileSystemModel

qt_fan_4k

It's weird that the code below does not work -- I copied almost everything from the qt4.8 example.
I can have a window, but nothing is displayed in the treeview. It's completely blank.
The code below is literally all I have, except main.cpp which I keep as the original.

What I got from qDebug is 'D:/', so the model is correct.

BTW, I tried to search for similar issues so that I don't ask silly and duplicated questions, but it seems there is no such engine to poll ...

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent)
{
    QTreeView *treeView = new QTreeView(this);
    // set up treeview
    QFileSystemModel model;
    model.setRootPath("d:/");
    treeView->setModel(&model);
    qDebug(model.rootPath().toAscii().data());
 
    // Demonstrating look and feel features
    treeView->setAnimated(false);
    treeView->setIndentation(20);
    treeView->setSortingEnabled(true);
    this->setCentralWidget(treeView);
}

Devopia53

Hi

Since you allocate your QFileSystemModel on the stack it's destroyed at the end of MainWindow constructor.

So you allocate on the heap...

QFileSystemModel *model = new QFileSystemModel;

qt_fan_4k

@Devopia53
Thank you so much.
Been playing with C++ for years and now have silly forgotten object life-cycle !
It is now solved.