QProcess to shutdown doesn't work

[davethomaspilot]

I have this method:

void MainWindow::shutdown()
 {
     //::gpioWrite(ENA_12V,PI_LOW);
     QProcess process;
     qDebug() << "Powering down the rpi" ;
     process.startDetached("sudo systemctl poweroff --no-block");
 }

void MainWindow::shutdown()
 {
     //::gpioWrite(ENA_12V,PI_LOW);
     QProcess process;
     qDebug() << "Powering down the rpi" ;
     process.startDetached("sudo systemctl poweroff --no-block");
 }

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It's running on an RPI (Bookworm 64 bit OS). The pi doesn't shutdown.

If I run

sudo systemctl poweroff --no-block

sudo systemctl poweroff --no-block

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the rpi shuts down as expected.

Why doesn't it work as a QProcess?