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

[bsarevalo]

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.

[d_stranz]

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:

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

int main( int argc, char ** argv )
{
    QApplication a( argc, argv );
    a.setWindowIcon( QIcon( ":/MyApp/Resources/MyIcon.png" );

    MainWindow w;
    w.show();

    return a.exec();
}

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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.