How to change the app resolution

[roseicollis]

Hi!

I'm making a new GUI app and I want it to show up with a especific resolution, so when in main.cpp I say w.show() it runs in 550x300. I've tried w.resize() but it just shows a little part of the screen instead of change its resolution so if I put an element like this:

QRect rec = QApplication::desktop()->screenGeometry();
    int h= rec.height()/8;
    int w= rec.width();
 
    button->setMinimumSize(w,h); //this button will fit inside the screen with full width
    button->setMaximumSize(w,h);

QRect rec = QApplication::desktop()->screenGeometry();
    int h= rec.height()/8;
    int w= rec.width();

    button->setMinimumSize(w,h); //this button will fit inside the screen with full width
    button->setMaximumSize(w,h);

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with the resize I just see a part of the button and I should see it complety.

Thanks.