How to convert saved geometry to readable text?

oracle3001

When one calls saveGeometry() it stores the geometry information as a QByteArray. I would like to be able to print this to screen as a QString in order to debug an issue I have.

I can't for the life of me work out what format Qt is saving this in and how to recover a readable string i.e. containing position / size of the widget in terms of readable ints.

mrjj

Hi this is the format

QByteArray QWidget::saveGeometry() const
{
    QByteArray array;
    QDataStream stream(&array, QIODevice::WriteOnly);
    stream.setVersion(QDataStream::Qt_4_0);
    const quint32 magicNumber = 0x1D9D0CB;
    // Version history:
    // - Qt 4.2 - 4.8.6, 5.0 - 5.3    : Version 1.0
    // - Qt 4.8.6 - today, 5.4 - today: Version 2.0, save screen width in addition to check for high DPI scaling.
    quint16 majorVersion = 2;
    quint16 minorVersion = 0;
    const int screenNumber = QApplication::desktop()->screenNumber(this);
    stream << magicNumber
           << majorVersion
           << minorVersion
           << frameGeometry()
           << normalGeometry()
           << qint32(screenNumber)
           << quint8(windowState() & Qt::WindowMaximized)
           << quint8(windowState() & Qt::WindowFullScreen)
           << qint32(QApplication::desktop()->screenGeometry(screenNumber).width()); // 1.1 onwards
    return array;
}

You can reuse the load function and simply convert the variables to strings using QString::number

bool QWidget::restoreGeometry(const QByteArray &geometry)
{
    if (geometry.size() < 4)
        return false;
    QDataStream stream(geometry);
    stream.setVersion(QDataStream::Qt_4_0);

    const quint32 magicNumber = 0x1D9D0CB;
    quint32 storedMagicNumber;
    stream >> storedMagicNumber;
    if (storedMagicNumber != magicNumber)
        return false;

    const quint16 currentMajorVersion = 2;
    quint16 majorVersion = 0;
    quint16 minorVersion = 0;

    stream >> majorVersion >> minorVersion;

    if (majorVersion > currentMajorVersion)
        return false;
    // (Allow all minor versions.)

// these are the variables you want to output. 
    QRect restoredFrameGeometry;
     QRect restoredNormalGeometry;
    qint32 restoredScreenNumber;
    quint8 maximized;
    quint8 fullScreen;
    qint32 restoredScreenWidth = 0;

    stream >> restoredFrameGeometry
           >> restoredNormalGeometry
           >> restoredScreenNumber
           >> maximized
           >> fullScreen;

    if (majorVersion > 1)
        stream >> restoredScreenWidth;
xxxx

oracle3001

@mrjj Thank you