AS
int main(int argc, char *argv[])
{
qputenv("QT_DEBUG_PLUGINS", QByteArray("1"));
QCoreApplication a(argc, argv);
QPluginLoader *plugin = new QPluginLoader;
plugin->setFileName("plugins/plugin");
QObject *pluginLoaderObject = plugin->instance();
QObject *myObject = qobject_cast<QObject *>(pluginLoaderObject);
plugin->unload();
qDebug() << plugin->isLoaded(); //false
QThread::sleep(20000);
}