#include <QApplication>
#include <QDebug>
#include <QDesktopWidget>
#include <QTimer>

class Widget : public QWidget
{
public:
	~Widget() {}
	explicit Widget(QWidget *parent = 0) : QWidget(parent){

		QTimer::singleShot(10000, this, &QWidget::show);
		QTimer::singleShot(11000, this, [this]{

			int ns = qApp->desktop()->screenCount();
			qDebug() << QString("numScreens: %1").arg(ns);
			for(int i=0; i< ns; ++i)
			{
				qDebug() << QString("screen %1").arg(i);

				QRect geom = qApp->desktop()->screenGeometry(i);
				qDebug() << QString("%1:%2    %3 x %4").arg(geom.x()).arg(geom.y()).arg(geom.width()).arg(geom.height());
			}
		});

		qDebug() << "widget created";

	}
};

int main(int argc, char *argv[])
{
	QApplication a(argc, argv);
	Widget w;

	return a.exec();
}