#include "QtWidgetsApplication1.h"
#include <QApplication>

#include <QStyleHints>

class MainWindow : public QMainWindow {
public:
   MainWindow() {

      const QColor& abColor = palette().color(QPalette::AlternateBase);

      const int r = abColor.red();
      const int g = abColor.green();
      const int b = abColor.blue();
   }
};

int main(int argc, char* argv[]) {
   QApplication app(argc, argv);

   app.setStyle("windows11");
   QStyleHints* styleHint = qApp->styleHints();
   styleHint->setColorScheme(Qt::ColorScheme::Dark);
   MainWindow window;
   window.resize(400, 300);
   window.show();
   return app.exec();
}