QML Image: Failed to get image from provider

Hi everybody,

I have a problem when importing images from C++ into QML

Quote:

//main.cpp

Code:

QmlApplicationViewer viewer;
    QDeclarativeEngine * engine = viewer.engine();
    engine->addImageProvider(QLatin1String("thumbnail"), new ContactsImageProvider);

//QML delegate file

Code:

Image {
        id: personPhoto
 
        height: 75
        width: 75
        source: "image://thumbnail/" + contactId
        anchors.left: parent.left
    }

//ContactsImageProvider

Code:

ContactsImageProvider::ContactsImageProvider()
    :QDeclarativeImageProvider(QDeclarativeImageProvider::Image)
{
    m_contactsManager = new QContactManager;
}
 
ContactsImageProvider::~ContactsImageProvider()
{
    delete m_contactsManager;
}
 
QImage ContactsImageProvider::requestImage(const QString& id, QSize* size, const QSize& requestedSize)
{
    QContact contact = m_contactsManager->contact(id.toUInt());
    QContactThumbnail thumb = contact.detail(QContactThumbnail::DefinitionName);
    QImage thumbnail = thumb.thumbnail();
    if(!thumbnail.isNull())
    {
        return thumbnail;
    }
    return QImage();
}

I always got the following error

Quote:

QML Image: Failed to get image from provider

is there a solution?