From QApplication doc : For any GUI application using Qt, there is precisely one QApplication object, no matter whether the application has 0, 1, 2 or more windows at any given time. You can not have multiple QApplication objects.
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Re: event loop already running
From QApplication doc : For any GUI application using Qt, there is precisely one QApplication object, no matter whether the application has 0, 1, 2 or more windows at any given time. You can not have multiple QApplication objects.
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