Screen Shot C++

#include <qpixmap.h>
#include <qapplication.h>
#include <qdesktopwidget.h>

class Screenshot : public QWidget
{
 public:
  Screenshot(QWidget* parent = 0);
};

Screenshot::Screenshot(QWidget* parent) : QWidget(parent)
{
 QDesktopWidget desktop;
 QPixmap p;
 p.resize(desktop.size());
 p = QPixmap::grabWindow (desktop.screen()->winId());
 p.save("screenshot.png", "PNG");
}

int main(int argc, char** argv)
{
 QApplication app(argc, argv);
 Screenshot s;
 app.setMainWidget(&s);
 s.show();
 return app.exec();
}