[Interest] App crashing because of ImageProvider when exiting

[Nuno Santos]

Jean,

This is the main context. It will not get out until app.exec() terminates.

That’s why I’m connecting to aboutToQuit signal in order to remove the provider from the Qml engine. 

I had the provider instantiated inside the controller but I was having this problem already, therefore my efforts in getting it fixed.

QQmlApplicationEngine *e;

int main(int argc, char *argv[])
{
    QGuiApplication app(argc, argv);

    Controller controller;

    QQmlApplicationEngine engine;

    e = &engine;

    engine.rootContext()->setContextProperty("controller", &controller);
    engine.load(QUrl(QStringLiteral("qrc:/qml/main.qml")));

    ImageProvider imageProvider;
    engine.addImageProvider("pictures", &imageProvider);

    QObject::connect(&app, &QGuiApplication::aboutToQuit, [=]()
    {
        e->removeImageProvider("pictures");
    });

    return app.exec();
}

Any ideas?

Regards,

Nuno

> On 25 Jul 2018, at 11:30, Jean-Michaël Celerier <jeanmichael.celerier at gmail.com> wrote:
> 
> Shouldn't you allocate your ImageProvider on the heap or at least ensure that it survives during the whole execution ? here it will be deleted by the end of your function
> 
> 
> 
> -------
> Jean-Michaël Celerier
> http://www.jcelerier.name <http://www.jcelerier.name/>
> On Wed, Jul 25, 2018 at 11:24 AM, Nuno Santos <nunosantos at imaginando.pt <mailto:nunosantos at imaginando.pt>> wrote:
> Hi,
> 
> Yesterday I have used for the first time a QQuickImageProvider but I’m having problems because now the app crashes when I terminate it.
> 
> Tried to do the following in order to avoid the crash but it is crashing anyway:
> 
> ImageProvider imageProvider;
> engine.addImageProvider("pictures", &imageProvider);
> 
> QObject::connect(&app, &QGuiApplication::aboutToQuit, [=]()
> {
>     e->removeImageProvider("pictures");
> });
> 
> The crash is always something like this:
> 
> malloc: *** error for object 0x7ffeef34e900: pointer being freed was not allocated
> 
> Does anyone knows how to fix this?
> 
> Thanks!
> 
> Regards,
> 
> Nuno
> 
> 
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