qApp->quit() from other class not working

naj_

Hey there,

when I start my application I check a catalog of files if any file is missing. If there is any file missing, I show a custom messagebox (just a class which inherits from QMessageBox) to the user. In this messagebox the user has the ability to click on Exit, to quit the whole application. This is how I achieve it:

        QAbstractButton *openAnywayBtn;
        QAbstractButton *exitBtn;
        // -----------------------------
        QAbstractButton *showListBtn;
        QAbstractButton *deleteFromCatBtn;
        if (missingFiles.count() >= 20) {
            box->setBoxDescription(tr("There are more than 20 files missing in your catalog."));
            showListBtn = box->addButton(tr("Show Detailed List"), QMessageBox::ResetRole);
            openAnywayBtn = box->addButton(tr("Open anyway"), QMessageBox::YesRole);
            exitBtn = box->addButton(tr("Exit"), QMessageBox::NoRole);
        } else {
            box->setBoxDescription(_msg + _files);
            openAnywayBtn = box->addButton(tr("Open anyway"), QMessageBox::ResetRole);
            deleteFromCatBtn = box->addButton(tr("Delete from Catalog"), QMessageBox::YesRole);
            exitBtn = box->addButton(tr("Exit"), QMessageBox::NoRole);
        }
        box->exec();
        if (box->clickedButton() == exitBtn) {
            qApp->quit();
        }

My main.cpp just looks like this:

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    CatalogFileList *list = new CatalogFileList("C:/Users/Jan/Desktop/DefaultCatalog");

    QStringList catalogFiles;
    if (list->readXml()) {
        if (list->checkFiles()) { // the check is included in this function
            catalogFiles = list->getFiles();
        }
    }

    QMainWindow w;
    w.showMaximized();

    return app.exec();
}

When the user clicks on Exit, nothing happens. The window is show and the QApplication instance is running normally. How can I achieve to close the whole application from this MessageBox. I tried out many ways (just like QObject::connect with the slot of qApp).

Many thanks,
Jan

hskoglund

Hi, try your connect this way:

connect(exitBtn, SIGNAL(clicked()), &qApp, SLOT(quit()), Qt::QueuedConnection);

You need the QueuedConnection flavor to survive the app.exec() call, for more see here