MOC not running for class derived from QGraphicsObject

[marcvanriet]

Hi,

I am writing a diagramming object to use in a graphics scene. It must be capable of emitting some signals, so I derived it from QGraphicsObject.

When I build my program, I get a linker error saying "error: unresolved external symbol "public: virtual struct QMetaObject const * __thiscall CmgDiagram::metaObject(void)const " ...". This is typically when moc isn't executed to generate the extra methods for the class. There is no moc_... file in my build output directory either.

This is the definition of my class :

class CmgDiagram : public QGraphicsObject
{
    Q_OBJECT
 
public:
    CmgDiagram(QGraphicsScene *pScene, QGraphicsObject * parent = 0);
 
    QRectF boundingRect() const;
    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget);
 
    CmgDiagramItem *getItem( QString sPath );
    void WriteXML( QXmlStreamWriter *pXML );
 
private:
    QGraphicsScene *m_pScene;
    CmgDiagramItem *m_pMainItem;
 
private slots:
    void selectionChanged( void );
};

class CmgDiagram : public QGraphicsObject
{
    Q_OBJECT

public:
    CmgDiagram(QGraphicsScene *pScene, QGraphicsObject * parent = 0);

    QRectF boundingRect() const;
    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget);

    CmgDiagramItem *getItem( QString sPath );
    void WriteXML( QXmlStreamWriter *pXML );

private:
    QGraphicsScene *m_pScene;
    CmgDiagramItem *m_pMainItem;

private slots:
    void selectionChanged( void );
};

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Why doens't this work ?

MOC runs just fine for another class in the same project that is derived from QGraphicsView.

Best regards,
Marc

[wysota]

Did you run qmake after adding the Q_OBJECT macro to the class?