How to use QDir and QFileDialog

From Forum Nokia Wiki

ID	...	Creation date	June 18, 2009
Platform	S60 3rd Edition, FP1, FP2 S60 5th Edition	Tested on devices	Nokia 5800 XpressMusic
Category	Qt for S60	Subcategory	UI

Keywords (APIs, classes, methods, functions): QFileDialog::getExistingDirectory(), QDir::entryList()

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 the 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.

Preconditions

Download and Install latest version Qt for Symbian - Installation packages which has links on how to install the latest version

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.

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