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void screenShot()
{
QString image_str = "screenshot.png";
QWidget *desktop_w = QApplication::desktop();
WId w = desktop_w->winId();

QScreen *screen = QApplication::primaryScreen();
QPixmap pixmap = screen->grabWindow(w, 0, 0, desktop_w->width(), desktop_w->height());

if(image_str .isNull())
    return;

if(pixmap.save(image_str , "PNG", 40) == false)
    {
        QFile(image_str ).remove();
    }
}

          QPixmap pixmap;
          QByteArray bytes;
          QBuffer buffer(&bytes);
          buffer.open(QIODevice::WriteOnly);
          pixmap.save(&buffer, "PNG");