Showing different Class from main.cpp

Question

I am new to qt. i have an application which have several forms.

i am trying to select the specific form from main.cpp, but it just flickered the form. But i am getting th

Answer 1

The problem is that w in both cases have a limited scope inside the "if" so they are destroyed instantly. One solution is to use pointers managing dynamic memory, for example using QScopedPointer:

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

    QScopedPointer<QWidget> w;

    int theme  = 2;

    if(theme == 1)
    {
        w.reset(new Design1);
    }
    else{
      w.reset(new Dialog);
    }

    if(w){
        w->showMaximized();
        w->show();
    }

    return a.exec();
}