I want to use QTcpSocket and QSslSocket in my shared library, but I confused by necessity to create QCoreApplication. Maybe I'm mistaken and there is no need to create QtCoreApplication ? What is the minimum dependence to use Qt Sockets?
What is the minimum dependence to use QtNetwork classes
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By using QTcpSocket, you're likely to want an event loop. This is provided by QCoreApplication, or QApplication if you're using widgets.