change default icon app (Dock - Taskbar) QTcreator QT6.8 - Ubuntu 24 LTS

Greetings! I'm getting started in programming with QT Creator, the application I created is an interface to communicate with an ESP32, so far so good.

I want to customize the application before launching it and I have managed to modify the icon with the .desktop file, what I have not been able to do is change the default icon when opening the application, which is the icon that is seen in the taskbar!

Could you help me with a little guidance, perhaps it would be very good for me.

Are you talking about the icon that appears in the top left corner of the application window's title bar?

For that, in your main() method:

Code:

---

int main( int argc, char ** argv )
{
    QApplication a( argc, argv );
    a.setWindowIcon( QIcon( ":/MyApp/Resources/MyIcon.png" );
 
    MainWindow w;
    w.show();
 
    return a.exec();
}

---

where "MyIcon.png" is the image file you have compiled into your application (under the resource path "MyApp/Resources") using the Qt resource compiler (rcc) that is part of the build process.