[Interest] Signals, slots before the event loop starts?

Konstantin Shegunov kshegunov at gmail.com
Thu Apr 11 16:07:23 CEST 2019

On Thu, Apr 11, 2019 at 4:57 PM Jason H <jhihn at gmx.com> wrote:

> Update on this:
> It didn't work. I called it, nothing (discernable) happened. Got a bunch
> of serial port not open errors....

Something else's amiss. Here's the test-case:

#include <QCoreApplication>

#include <QDebug>

int main(int argc, char *argv[])


    QCoreApplication app(argc, argv);

    QObject::connect(&app, &QCoreApplication::aboutToQuit, [] () -> void  {

        qDebug() << "Goodbye cruel world!";


    QMetaObject::invokeMethod(&app, &QCoreApplication::quit,

    return QCoreApplication::exec();


Which produces (as expected):

17:05:37: Debugging starts

Goodbye cruel world!

17:05:38: Debugging has finished
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