Using resources in Qt

Article Metadata

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Tested with

Devices(s): Nokia N97

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Compatibility

Platform(s): Qt

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Article

Keywords: Qt, resources

Created: (24 Nov 2009)

Last edited: copyeditor (24 Nov 2009)

Overview

This snippet shows how to add and reference resources in Qt.

Preconditions

• Qt is installed on your platform.
  • S60:
    • Download Qt for S60 release from here: Qt for S60 pre-release
    • Install Qt for S60: Installing Qt on S60
    • Check this link for installation guide: How to install the package
  • Maemo:
    • More information about Qt on Maemo can be found here: Qt4 Maemo port

Using resources in Qt

QRE.pro

Add a resource file to a project file:

#  Copyright (c) 2009 Nokia Corporation
TEMPLATE = app
TARGET = QRE
QT += core \
    gui
SOURCES += main.cpp
# This is how the qre.qrc is added to the project.
RESOURCES += qre.qrc

qre.qrc

Add resources to a resource file:

<!-- Copyright (c) 2009 Nokia Corporation  -->
<RCC>
    <qresource prefix="/" >
        <file>qt-logo.png</file>
    </qresource>
</RCC>

qt-logo.png

main.cpp

Reference resources from the code:

/*
 * Copyright (c) 2009 Nokia Corporation
 */
#include <QtGui>
#include <QApplication>
 
int main(int argc, char *argv[]) {
    QApplication a(argc, argv);
    /* QMainWindow as our window */
    QMainWindow* w = new QMainWindow;
    /* QFrame as our centralWidget */
    QFrame* centralW = new QFrame(w);
    w->setCentralWidget(centralW);
    /* QVBoxLayout as our central widgets layout */
    QVBoxLayout* layout = new QVBoxLayout(centralW);
    centralW->setLayout(layout);
 
    /* QLabel is used as our logo container. */
    QLabel* qtLogoContainer = new QLabel;
    /* QPixmap is used to load the image from resources
     * defined in qre.qrc file. */
    qtLogoContainer->setPixmap(QPixmap(":/qt-logo.png"));
    /* To get the logo shown we need to add the container containing
     * the logo to the layout. */
    layout->addWidget(qtLogoContainer);
 
    /* We'll display the window maximized. */
    w->showMaximized();
    /* Run till the execution ends. */
    int returnValue = a.exec();
    /* Flag the window to be deleted.*/
    w->deleteLater();
    /* Return the execution return value.*/
    return returnValue;
}

Postconditions

Now you know how to add and reference resources in Qt.

See also

• The Qt Resource System