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I have a pre-existing application, that calls out into a plugin library. I want the plugin library to be developed in Qt, and to be able to display a Qt UI.
However, when I attempt to create a QWidget it complains that the QApplication needs to be created first.
Is it not possible to use Qt to develop cross platform plugins?
E.g. a netscape plugin for Chrome or Firefox. I do not, and cannot, control the app’s main loop.
As explain in the Qt documentation, any GUI application using Qt needs a
QApplicationto be created into main thread since it is containing all signal engine and event loop.