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&#40;QLatin1String("qml/testleak/main.qml"&#41;&#41;;
viewer.showExpanded();    

QmlApplicationViewer viewer1;
viewer1.setOrientation(QmlApplicationViewer::ScreenOrientationAuto);
viewer1.setMainQmlFile&#40;QLatin1String("qml/testleak/main.qml"&#41;&#41;;
viewer1.showExpanded();


return app->exec(&#41;;

}@

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&#40;QLatin1String("qml/testleak/main.qml"&#41;&#41;;
viewer.showExpanded();
viewer.show();

QmlApplicationViewer viewer1;
viewer1.setOrientation(QmlApplicationViewer::ScreenOrientationAuto);
viewer1.setMainQmlFile&#40;QLatin1String("qml/testleak/main.qml"&#41;&#41;;
viewer1.showExpanded();


return app->exec(&#41;;

}@

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.