#include <QPrinter>
#include <QDebug>
#include <QPrintDialog>
#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    QPrinter printer;
    QPrintDialog printDialog(&printer, NULL);
    if (printDialog.exec() == QDialog::Accepted)
    {
        QRect pageRect = printer.pageRect();
        qDebug() << pageRect;
    }

    return 0;
}