QWidget forced the application closed

[cic]

I have an application which not implimented with QT.
But I only want a small part which uses the Qwidget to make some GUIs.

I find when I created the first QWidget and closed it, the whole application exits.
It is possible that Qt treats the first QWidget as a mainwindow for the application. After closing the main window, the application should be also closed.
Is there any idea to prevent this issue?


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been solved

QWidget::setAttribute(Qt::WA_QuitOnClose, false)