How to use QDir and QFileDialog in Qt

Article Metadata

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Code Example

Source file: Media:QtFileDialog.zip

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Tested with

Devices(s): Nokia 5800 XpressMusic

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Compatibility

Platform(s): Qt

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Article

Keywords: QFileDialog::getExistingDirectory(), QDir::entryList()

Created: ebra (16 Jun 2009)

Last edited: hamishwillee (11 Oct 2012)

Overview

This code snippets shows how to get a list of files from a given directory and how to use QFileDialog to select directories. The method QDir::entryList() returns a list of the names of all the files and directories in the directory. QFileDialog::getExistingDirectory() will return an existing directory selected by the user, this dialog can allow you to select directory of your choice.

This snippet can be self-signed as it does not use any API which require developer/certified signing.

Headers required

#include <QDir>
#include <QFileDialog>

Source

#include <QtGui/QApplication>
#include "mainwindow.h"
 
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();
    return a.exec();
}

#ifndef MAINWINDOW_H
#define MAINWINDOW_H
 
#include <QtGui/QMainWindow>
#include <QDir>
 
namespace Ui
{
    class MainWindow;
}
 
class MainWindow : public QMainWindow
{
    Q_OBJECT
 
public:
    MainWindow(QWidget *parent = 0);
    ~MainWindow();
 
private slots:
    void changeDirectory();
    void fillList();
 
private:
    Ui::MainWindow *ui;
    QDir directory;
};
 
#endif // MAINWINDOW_H

#include <QFileDialog>
#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent), ui(new Ui::MainWindow), directory("/")
{
    ui->setupUi(this);
 
    connect(ui->actionChange_directory, SIGNAL(triggered()), this, SLOT(changeDirectory()));
 
    fillList();
}

MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::changeDirectory()
{
/* select a directory using file dialog */
    QString path = QFileDialog::getExistingDirectory (this, tr("Directory"), directory.path());
    if ( path.isNull() == false )
    {
        directory.setPath(path);
        fillList();
    }
}

/*get list of file from given directory and the append it to listWidget */
void MainWindow::fillList()
{
    ui->listWidget->clear();
    ui->listWidget->addItems(directory.entryList());
}

Postconditions

The code snippet is expected to show get a list of files in a given directory.

Select/change Directory using QFileDialog

Get list of files using QDir

External Links

• QDir: QDir reference
• QFileDialog: QFileDialog reference

Code Example

• The Code Example will show how to get list of files from given directory and is tested on Nokia 5800 XpressMusic.

Related Links

• Archived:Save and Open Files with QFileDialogBox