Daily Archives: April 17, 2017

Qt – ListView SetModel tip

when developing qt, QStringList should be display on ‘ui->listView’, However, following code won’t work.

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MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
...
    QDir myDir("C:\\");
 
    QStringList filter("*");
    QStringListModel model;
    QStringList filesList = myDir.entryList(QStringList(filter),QDir::Files | QDir::Dirs);
    model.setStringList(filesList);
    ui->listView->setModel(&model);
...
}

because ‘model’ object will be delete after function is done.

ui->listView will not be able to get model object.

move to MainWindow ‘model’ to MainWindow declare will be good.

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class MainWindow : public QMainWindow
{
    Q_OBJECT
 
public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
    QStringListModel model;
private:
    Ui::MainWindow *ui;
};
 
 
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
...
    QDir myDir("C:\\");
 
    QStringList filter("*");
 
    QStringList filesList = myDir.entryList(QStringList(filter),QDir::Files | QDir::Dirs);
    model.setStringList(filesList);
    ui->listView->setModel(&model);
...
}