Hi all

I have application which load all plugins in directory plugins and show thier menus. I do this in class plugins:

Qt Code: 
  1. bool Plugins::loadPlugins()
  2. {
  3. 	QDir dir("./plugins");
  4. 	if (!dir.exists())
  5. 		return false;
  6.  
  7. 	foreach (QString filename, dir.entryList(QDir::Files))
  8. 	{
  9. 		loader->setFileName(dir.absoluteFilePath(filename));
  10. 		QObject *couldBeFilter = loader->instance();
  11. 		if (couldBeFilter)
  12. 		{
  13. 			PluginInterface *plugin = qobject_cast<PluginInterface*>(couldBeFilter);
  14. 			if (plugin)
  15. 			{
  16. 				plugins.insert(plugin->name(), plugin);
  17. 				connect(plugin->menu(), SIGNAL(writeData(QByteArray)), this, SIGNAL(dataOut(QByteArray)));
  18. 			}
  19. 		}
  20. 	}
  21.  
  22. 	return true;
  23. }
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Then I have class PluginInterface:

Qt Code: 
  1. class PluginInterface
  2. {
  3.  
  4. public:
  5. 	virtual QString name() const = 0;
  6. 	virtual Menu* menu() const = 0;
  7. };
  8.  
  9. Q_DECLARE_INTERFACE(PluginInterface, "sk.kimle.PluginInterface/0.1")
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And now I am writing plugin. First I inherit from this interface this class:

Qt Code: 
  1. class ProgramViewer : public QObject, PluginInterface
  2. {
  3.     Q_OBJECT
  4.     Q_INTERFACES(PluginInterface)
  5.  
  6. public:
  7.     ProgramViewer();
  8.     virtual ~ProgramViewer();
  9. 	virtual QString name() const;
  10. 	virtual Menu* menu() const;
  11. private:
  12. 	QString pluginName;
  13. };
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Function menu() return Menu object. It inherits from QWidget and have only virtual functions and slots:

Qt Code: 
  1. class Menu : public QWidget
  2. {
  3.     Q_OBJECT
  4.  
  5. public:
  6.     Menu(){}
  7.     ~Menu(){}
  8.     virtual void showWindow() const = 0;
  9.     virtual void makeConnections() = 0;
  10. public slots:
  11. 	virtual void readData(QByteArray array) =0;
  12. signals:
  13. 	virtual void writeData(QByteArray array);
  14. };
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I have also class which inherits from Menu and this class has other widgets and functions.

Qt Code: 
  1. class ProgramViewerMenu : public Menu
  2. {
  3.     Q_OBJECT
  4.  
  5. public:
  6. 	enum DataToSend
  7. 	{
  8. 		NewImage = 1,
  9. 		Pixels,
  10. 		Stop
  11. 	};
  12.     ProgramViewerMenu();
  13.     ~ProgramViewerMenu();
  14.     void showWindow() const;
  15.     void makeConnections();
  16.     bool startBroadcasting();
  17.     bool stopBroadcasting();
  18.     QByteArray* takeShot(WId id);
  19.     QByteArray* changePixels(QImage oldOne, QImage newOne);
  20. public slots:
  21. 	void readData(QByteArray array);
  22. 	void broadcasting();
  23. 	void capture();
  24. 	void refreshList();
  25. signals:
  26. 	void writeData(QByteArray array);
  27. private:
  28. 	QLabel *title;
  29. 	QPushButton *broadcast;
  30. 	QPushButton *refresh;
  31. 	QGridLayout *grid;
  32. 	QListWidget *list;
  33. 	QTimer *timerRefresh;
  34. 	QTimer *timerBroadcast;
  35. 	QImage screen;
  36. 	WId id;
  37. 	bool isBroadcasting;
  38. };
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In some functions of this class I want to emit writeData(QByteArray) signal which is connected in the first class. But I ve got this error:
In function `ZN17ProgramViewerMenu11qt_metacallEN11QMetaObject 4CallEiPPv':
In function `ZN17ProgramViewerMenu11qt_metacastEPKc':
undefined reference to `Menu::qt_metacall(QMetaObject::Call, int, void**)'
undefined reference to `Menu::qt_metacast(char const*)'

I do not know whats wrong. I am not sure about those virtual functions, signals and slots and also I do not know if it is possible to connect something to plugin. Can anybody solve this? Thanks.

Sorry about my english.