#include <QApplication>
#include <QPixmap>
#include <QDesktopWidget>
QPixmap *p = new QPixmap;
QDesktopWidget * descktop = QApplication::desktop();
*p = QPixmap::grabWindow(descktop->winId());
QImage *img = new QImage;
*img = p->toImage();
QRgb b = img->pixel(800,350);
QColor *c = new QColor;
c->setRgb(b);
qDebug() << c->name();