QScreen of multi-monitor cannot be returned.

Hugh_Zen

I'm developing a Qt app on dual monitors and using 6.2.
QApplication screens() always returns a single Screen value.
It has the geometry value of the secondary monitor and does not get the information of the primary monitor.

#include "mainwindow.h"

#include <QApplication>
#include <QScreen>
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();

    qDebug().noquote() << "Screen size:             : " << QApplication::screens().size();
    foreach(QScreen *screen, QApplication::screens()) {
        qDebug().noquote() << "Name             : " << screen->name();
        qDebug().noquote() << "DevicePixelRatio : " << screen->devicePixelRatio();
        qDebug().noquote() << "Width            : " << screen->geometry().width();
        qDebug().noquote() << "Height           : " << screen->geometry().height();
        qDebug().noquote() << "Size             : " << screen->geometry().size();
        qDebug().noquote() << "Geom             : " << screen->geometry();
    }


    qDebug().noquote() << "Primary screen Geom             : " << QApplication::primaryScreen()->geometry();
    return a.exec();
}

result

[15704] Screen size: : 1
[15704] Name : DELL U2722D
[15704] DevicePixelRatio : 1
[15704] Width : 2560
[15704] Height : 1440
[15704] Size : QSize(2560, 1440)
[15704] Geom : QRect(2560,0 2560x1440)
[15704] Primary screen Geom : QRect(2560,0 2560x1440)

On the other computer, the QScreen on the dual monitor returns normally without any problems.

Any solution?

SGaist

Hi,

Are they both desktop machines ?
What are the differences between them ?

Chris Kawa

Maybe a silly question, but are the monitors in extend or duplicate mode? Duplicate would return a single entry.

Guitronic

Hi,
same in Qt 6.2 with Windows 10.
Is there a solution?

Shatyuka

Same here with Qt 6.2.4 Windows 11, works fine with Qt 6.4.

Shame of LTS.