Vladislav Ladenkov Vladislav Ladenkov - 2 months ago 13
C++ Question

How to restart QT app with Dialog Button

Here's the main.cpp. In one of the class'es scource code, I raise a QMessageBox and i want to restart the whole application(main function) if I push "yes"(Restart = open dialog, make setup, and get new GraphScene). To be completly clear, I want smth like:


If thats not possbile with QMessageBox - what is the best way to do it? Thanks!

int main(int argc, char *argv[])
QApplication a(argc, argv);
ConfigurationDialog dlg;

QGraphicsView gv;
QGraphicsScene gs;

PuzzlePiece item(PuzzlePiece::None, PuzzlePiece::Out, PuzzlePiece::In, PuzzlePiece::Out);

int cellSize = PIECE_SIZE;
QRect rect = item.boundingRect().toRect();
rect.translate(0.5 * cellSize + cellSize, 0.5 * cellSize + 5 * cellSize);

Logic logic;
QString P= ":/Image/Neyronnyie-seti.jpg";
logic.setup(dlg.puzzleSize(), P);


gv.setWindowTitle("pazzles scheme");

return a.exec();


Put your application execution logic into a loop. Just remember that calling exec() multiple times is okay but destroying and re-creating application object itself may lead you to troubles on some platforms.

bool reallyQuit = false;

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

    int exitCode = 0;

    // Global boolean here is just an example, you could break the loop some other way.
    while (!reallyQuit)
        // Create dialogs etc.

        exitCode = app.exec();

    return exitCode;

Then, just do qApp->quit() when you need to restart, directly or connecting QMessageBox'es accepted() signal to it.