Hello, This is ordinarily done with the help of a global locking primitive (for example a global mutex). On the first run the mutex would be locked, and if locking fails on the second one, you just exit the application. IMPORTANT: As any global resource, special care should be taken to release it in case of expected or unexpected program shutdown.
As for a Qt-way of doing this, you could try QSystemSemaphore ( http://doc.qt.io/qt-5/qsystemsemaphore.html). Kind regards.
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