Qdirmodel issue

[kamlmish]

Hi
I am facing a strange issue in the QDIRMODEL
I have written the below code on the SLOT function for the button SIGNAL( clicked), but when I run the code , the tree doesnt show and when I debug the code
QDirModel model
goes into qgrayraster

QDirModel model;
 QTreeView tree;
 tree.setModel(model);
 tree.setRootIndex(model->index(QDir::homePath()));
 tree.setColumnHidden( 1, true );
 tree.setColumnHidden( 2, true );
 tree.setColumnHidden( 3, true );
 tree.setWindowTitle(QObject::tr("Dir View:")+QDir::homePath());
 tree.resize(640, 480);
 tree.show();

QDirModel model;
 QTreeView tree;
 tree.setModel(model);
 tree.setRootIndex(model->index(QDir::homePath()));
 tree.setColumnHidden( 1, true );
 tree.setColumnHidden( 2, true );
 tree.setColumnHidden( 3, true );
 tree.setWindowTitle(QObject::tr("Dir View:")+QDir::homePath());
 tree.resize(640, 480);
 tree.show();

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May I know where am I going wrong

[Lykurg]

Probably basic C++ issue: Have a look at the difference of creating objects on the stack or heap. Also look at the lifetime of these objects!

[kamlmish]

but even when I do
QDirModel* model = new QDirModel;

I still get the same issue

[Lykurg]

Then you must show us the full code of your slot.

[kamlmish]

Class Declaration

class MainWindow : public QMainWindow
{
    Q_OBJECT
public:
    MainWindow(QWidget *parent = 0);
    ~MainWindow();
public:
    void createMenu();
 
public slots:
    void FileBrowseWindow();
    void ClearButton();
 
private:
    QLabel*             namelabel;
    QTextEdit*          nametext;
    QLabel*             loclabel;
    QTextBrowser*       locText;
    QPushButton*        browse_button;
    QPushButton*        ok_button;
    QPushButton*        cancel_button;
 
};

class MainWindow : public QMainWindow
{
    Q_OBJECT
public:
    MainWindow(QWidget *parent = 0);
    ~MainWindow();
public:
    void createMenu();

public slots:
    void FileBrowseWindow();
    void ClearButton();

private:
    QLabel*             namelabel;
    QTextEdit*          nametext;
    QLabel*             loclabel;
    QTextBrowser*       locText;
    QPushButton*        browse_button;
    QPushButton*        ok_button;
    QPushButton*        cancel_button;

};

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constructor

MainWindow::MainWindow(QWidget *parent):
    QMainWindow(parent)
{
    namelabel = new QLabel("Name",this);
    nametext = new QTextEdit(this);
    loclabel = new QLabel("Location",this);
    locText = new QTextBrowser(this);
    browse_button = new QPushButton("Browse",this);
    ok_button = new QPushButton("Ok",this);
    cancel_button = new QPushButton("Cancel",this);
    createMenu();
    connect(browse_button,SIGNAL(clicked()),SLOT(FileBrowseWindow()),Qt::DirectConnection);
    //connect(cancel_button,SIGNAL(clicked()),this,SLOT(ClearButton()),Qt::AutoConnection);
}

MainWindow::MainWindow(QWidget *parent):
    QMainWindow(parent)
{
    namelabel = new QLabel("Name",this);
    nametext = new QTextEdit(this);
    loclabel = new QLabel("Location",this);
    locText = new QTextBrowser(this);
    browse_button = new QPushButton("Browse",this);
    ok_button = new QPushButton("Ok",this);
    cancel_button = new QPushButton("Cancel",this);
    createMenu();
    connect(browse_button,SIGNAL(clicked()),SLOT(FileBrowseWindow()),Qt::DirectConnection);
    //connect(cancel_button,SIGNAL(clicked()),this,SLOT(ClearButton()),Qt::AutoConnection);
}

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SLOT function

void MainWindow::FileBrowseWindow()
{
    QDirModel* model = new QDirModel(this);
    QTreeView tree;
    tree.setModel(model);
    tree.setRootIndex(model->index(QDir::homePath()));
    tree.setColumnHidden( 1, true );
    tree.setColumnHidden( 2, true );
    tree.setColumnHidden( 3, true );
    tree.setWindowTitle(QObject::tr("Dir View:")+QDir::homePath());
    tree.resize(640, 480);
    tree.show();
 
}

void MainWindow::FileBrowseWindow()
{
    QDirModel* model = new QDirModel(this);
    QTreeView tree;
    tree.setModel(model);
    tree.setRootIndex(model->index(QDir::homePath()));
    tree.setColumnHidden( 1, true );
    tree.setColumnHidden( 2, true );
    tree.setColumnHidden( 3, true );
    tree.setWindowTitle(QObject::tr("Dir View:")+QDir::homePath());
    tree.resize(640, 480);
    tree.show();

}

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[Lykurg]

Well, it isn't enough to create the model on the heap. You should probably also create the tree on the heap...

[kamlmish]

thanks
solved the problem