main.cpp

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// ======================================================================
//  main.cpp
// ======================================================================
//                   This file is a part of the book 
//             "Qt 5.10 Professional programming with C++"
//                       http://qt-book.com
// ======================================================================
//  Copyright (c) 2017 by Max Schlee
// ======================================================================

#include <QtWidgets>

// ----------------------------------------------------------------------
int main(int argc, char** argv)
{
    QApplication app(argc, argv);

    QLabel   lbl("this is an example text");
    QLibrary lib("dynlib");

    lbl.setText(lbl.text());

    typedef QString (*Fct) (const QString&);
    Fct fct = (Fct)(lib.resolve("oddUpper"));
    if (fct) {
        lbl.setText(fct(lbl.text()));
    }
    lbl.show();

    return app.exec();
}