Change the size of pixmap in a label

[metRo_]

Hi,
I creat a label and add a image to pixmap of label:
#include "mainwindow.h"
#include <QtGui>

MainWindow::MainWindow(QWidget *parent) :
QWidget(parent)
{
QHBoxLayout *lay=new QHBoxLayout;
setLayout(lay);
QImage image("comando.jpg");
QLabel *imageLabel = new QLabel(this);
lay->addWidget(imageLabel);
imageLabel->setPixmap(QPixmap::fromImage(image));
}

MainWindow::~MainWindow()
{

}
and now i want to resize the image. I want set a size to the label like 200*200 and resize the image to it.