How can i start a global qml viewer or a child Form of my app?

[hexenbrennen]

Hi

"Picture":http://www.imgbox.de/show/img/0hG7WzqFOI.jpg

1 and 2 work but 3 doesnt work!
There are no exception and the window gets created for a short moment but than crashes.

i hope you can help me

Ciao

[MartinJ]

You created viewer2 on the stack. When the function exits it goes out of scope and is destroyed.

[hexenbrennen]

thx

but how can i create a global viewer?

or how can i start a child Form from a qml file?

[andre]

Create viewer2 on the heap instead. Creating objects on the stack in the main() function is fine, but elsewhere usually not.

[hexenbrennen]

now i have a memory leak after closing? there shoudnt be a problem with this or?

[andre]

Well, either make sure you delete it yourself, or simply give it a sensible parent object to delete it for you.

[hexenbrennen]

thx

when i call the viewer i exit the class and go to the app event loop.

how can i delete this Viewer/Object when the destructor is called manually?

the leak occurse after closing the app

[andre]

In order to delete an object manually (why do you insist on doing it manually?), you need to keep a pointer to the object around. So, make sure you get a pointer to it, and store it.

[hexenbrennen]

thx andre for your reply

but i dont get it.

when i have sth like this:

@Q_DECL_EXPORT int main(int argc, char *argv[])
{
QScopedPointer<QApplication> app(createApplication(argc, argv));

QmlApplicationViewer viewer;
viewer.setOrientation(QmlApplicationViewer::ScreenOrientationAuto);
viewer.setMainQmlFile(QLatin1String("qml/testleak/main.qml"));
viewer.showExpanded();    

QmlApplicationViewer viewer1;
viewer1.setOrientation(QmlApplicationViewer::ScreenOrientationAuto);
viewer1.setMainQmlFile(QLatin1String("qml/testleak/main.qml"));
viewer1.showExpanded();


return app->exec();

}@

how can i realize this command viewer.hide

after i started the qml app

[andre]

There is no memory leak in the code you just posted, though I can't judge what happens in createApplication() of course.

[hexenbrennen]

this produces the leak "view" gets never deleted

but more important would be how can I create more viewer after the app has started

@void init(QString qmlfile)
{
QmlApplicationViewer *view = new QmlApplicationViewer;
view->setOrientation(QmlApplicationViewer::ScreenOrientationAuto);
view->setSource(QUrl(qmlfile));
view->showExpanded();
return;
}

Q_DECL_EXPORT int main(int argc, char *argv[])
{
QScopedPointer<QApplication> app(createApplication(argc, argv));

init("qml/testleak/main.qml");

QmlApplicationViewer viewer;
viewer.setOrientation(QmlApplicationViewer::ScreenOrientationAuto);
viewer.setMainQmlFile(QLatin1String("qml/testleak/main.qml"));
viewer.showExpanded();
viewer.show();

QmlApplicationViewer viewer1;
viewer1.setOrientation(QmlApplicationViewer::ScreenOrientationAuto);
viewer1.setMainQmlFile(QLatin1String("qml/testleak/main.qml"));
viewer1.showExpanded();


return app->exec();

}@

[andre]

Keep the pointer to the QmlQpplicationViewer object somewhere. At the moment, you just let it go out of scope.

On the other hand, you could also just set the WA_DeleteOnClose flag on the widget.