Hi everybody,

I have a problem when importing images from C++ into QML
QML Image: Failed to get image from provider
//main.cpp
Qt Code: 
  1. QmlApplicationViewer viewer;
  2.     QDeclarativeEngine * engine = viewer.engine();
  3.     engine->addImageProvider(QLatin1String("thumbnail"), new ContactsImageProvider);
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//QML delegate file
Qt Code: 
  1. Image {
  2.         id: personPhoto
  3.  
  4.         height: 75
  5.         width: 75
  6.         source: "image://thumbnail/" + contactId
  7.         anchors.left: parent.left
  8.     }
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//ContactsImageProvider
Qt Code: 
  1. ContactsImageProvider::ContactsImageProvider()
  2.     :QDeclarativeImageProvider(QDeclarativeImageProvider::Image)
  3. {
  4.     m_contactsManager = new QContactManager;
  5. }
  6.  
  7. ContactsImageProvider::~ContactsImageProvider()
  8. {
  9.     delete m_contactsManager;
  10. }
  11.  
  12. QImage ContactsImageProvider::requestImage(const QString& id, QSize* size, const QSize& requestedSize)
  13. {
  14.     QContact contact = m_contactsManager->contact(id.toUInt());
  15.     QContactThumbnail thumb = contact.detail(QContactThumbnail::DefinitionName);
  16.     QImage thumbnail = thumb.thumbnail();
  17.     if(!thumbnail.isNull())
  18.     {
  19.         return thumbnail;
  20.     }
  21.     return QImage();
  22. }
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I always got the following error
QML Image: Failed to get image from provider
is there a solution?