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MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
{
gs=new QGraphicsScene(qApp->desktop()->availableGeometry(),this);
QGraphicsView* gv=new QGraphicsView(gs);
this->setCentralWidget(gv);
gv->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
QPixmap deskTop;
deskTop=QPixmap::grabWindow(QApplication::desktop()->winId());
QGraphicsPixmapItem *it_bk=gs->addPixmap(deskTop);
it_bk->setPos(0,0);
it_bk->setZValue(-1);
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.showFullScreen();
return a.exec();
}