[Split] QApplication subclassing problem

Tratstil

[Moderator's note: I've split off this topic from the "original thread":http://developer.qt.nokia.com/forums/viewthread/9098, as it is a different problem, Volker]

i have a class named qtgame which extends QApplication and has a function "init" to create some phonon::MediaObject. phonon::MediaObject needs application name to run correctly so I do it on main function.

@
int main(int argc, char *argv[])
{
qtgame _qtgame(argc,argv);
_qtgame.setOrganizationName(ORGANIZATION_NAME);
_qtgame.setOrganizationDomain(ORGANIZATION_DOMAIN);
_qtgame.setApplicationName(APPLICATION_NAME);
_qtgame.start();
return _qtgame.exec();
}
@
but phonon::MediaObject didn't run correctly. after that I have moved

@
_qtgame.setOrganizationName(ORGANIZATION_NAME);
_qtgame.setOrganizationDomain(ORGANIZATION_DOMAIN);
_qtgame.setApplicationName(APPLICATION_NAME);
@
to qtgame constructor like this
@
qtgame::qtgame(int argc, char *argv[]):QApplication(argc,argv){
setOrganizationName(ORGANIZATION_NAME);
setOrganizationDomain(ORGANIZATION_DOMAIN);
setApplicationName(APPLICATION_NAME);
init();
}
@
the sound works good but when i paused game by sweeping screen to home screen, then i resumed game it crash. I showed the log file (i write something when the game running) and get some thing like that.

but now it's ok, after changing some codes. Thanks for viewing.

goetz

You must have argc as a reference, not as a value to the constructor. See "this forum post":http://developer.qt.nokia.com/forums/viewreply/21990/ for an explanation.

The respective constructor of QApplication is:

@
QApplication ( int &argc, char **argv );
@

Change your constructor like this:

@
// WRONG version:
qtgame(int argc, char *argv[]);

// correct version:
qtgame(int &argc, char **argv);
@

Also, in your first version, where do you call init()? I cannot see a call to that function...

Tratstil

thanks for replying
but i think *argv[] === **argv :), i created a new project and Qt Creator made template code like this
@
int main(int argc, char *argv[])
{
QApplication app(argc, argv);

QmlApplicationViewer viewer;
viewer.setOrientation(QmlApplicationViewer::ScreenOrientationAuto);
viewer.setMainQmlFile&#40;QLatin1String("qml/abc/main.qml"&#41;&#41;;
viewer.showExpanded(&#41;;

return app.exec&#40;&#41;;

}
@
so it is not problem.

I put init() in qtgame constructor in my first version.

lgeyer

char *argv[] is not the problem, int argc is.

Tratstil

:D oh my mistake, thanks all

goetz

[quote author="Tratstil" date="1314177630"]
I put init() in qtgame constructor in my first version.[/quote]

Then it is crystal clear why it does not work:
You call setOrganizationName() and the others after the constructor of qtgame has finished. So, your init() method is called in the constructor just before the names have been set.

BTW:
You should consider to not "abuse" QApplication for your purposes. For me it looks a bit odd, and I would create a specialized object for the phonon stuff.