Hello!

I'm trying to create a widget which encapsulate the Direct3D engine(something like OpenGL widget). I have the following code:
.h
Qt Code: 
  1. class Direct3DWidget : public QWidget
  2. {
  3. 	Q_OBJECT
  4. public:
  5. 	Direct3DWidget(QWidget *parent = 0);
  6. 	~Direct3DWidget();
  7. 	bool InitDirect3D();
  8. public slots:
  9. 	bool Rendering();
  10. private:
  11. 	void paintEvent(QPaintEvent *p)
  12. 	{
  13. 		Rendering();
  14. 	}
  15. 	QPaintEngine* paintEngine()
  16. 	{
  17. 		return NULL;
  18. 	}
  19. 	LPDIRECT3D9 m_pD3D;
  20. 	LPDIRECT3DDEVICE9 m_pd3dDevice;
  21. };
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.cpp
Qt Code: 
  1. Direct3DWidget::Direct3DWidget(QWidget *parent /* = 0 */)
  2. {
  3. 	setFixedSize(200, 200);
  4. 	setAutoFillBackground(false);
  5. 	setAttribute(Qt::WA_PaintOnScreen, true);
  6. }
  7. Direct3DWidget::~Direct3DWidget()
  8. {
  9. 	if( m_pd3dDevice != NULL) 
  10. 		m_pd3dDevice->Release();
  11.  
  12. 	if( m_pD3D != NULL)
  13. 		m_pD3D->Release();
  14. }
  15. bool Direct3DWidget::InitDirect3D()
  16. {
  17. 	m_pD3D = Direct3DCreate9( D3D_SDK_VERSION);
  18. 	if( !m_pD3D)
  19. 		return false;
  20.  
  21. 	D3DPRESENT_PARAMETERS d3dpp = {0};
  22. 	d3dpp.Windowed = TRUE;
  23. 	d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD;
  24. 	d3dpp.BackBufferFormat = D3DFMT_UNKNOWN;
  25. 	d3dpp.FullScreen_RefreshRateInHz = D3DPRESENT_RATE_DEFAULT;
  26. 	d3dpp.PresentationInterval = D3DPRESENT_INTERVAL_IMMEDIATE;
  27. 	d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD;
  28. 	d3dpp.EnableAutoDepthStencil = TRUE;
  29. 	d3dpp.AutoDepthStencilFormat = D3DFMT_D16;
  30. 	HRESULT hr = m_pD3D->CreateDevice( D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, winId(),
  31. 		D3DCREATE_HARDWARE_VERTEXPROCESSING,
  32. 		&d3dpp, &m_pd3dDevice );
  33. 	if( FAILED(hr) || !m_pd3dDevice)
  34. 		return false;
  35. }
  36. bool Direct3DWidget::Rendering()
  37. {
  38. 	if(m_pd3dDevice == NULL)
  39. 		return false;
  40. 	m_pd3dDevice->Clear(0, NULL, D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER, D3DCOLOR_XRGB(255, 255, 0), 1.0f, 0);
  41. 	if(SUCCEEDED(m_pd3dDevice->BeginScene()))
  42. 	{
  43. 		m_pd3dDevice->EndScene();
  44. 	}
  45. 	m_pd3dDevice->Present( NULL, NULL, NULL, NULL );
  46. 	return true;
  47. }
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main.cpp
Qt Code: 
  1. int main(int argc, char *argv[])
  2. {
  3. 	QApplication a(argc, argv);
  4.  
  5. 	QMainWindow window;
  6. 	Direct3DWidget* widget = new Direct3DWidget(&window);
  7.  
  8. 	window.show();
  9. 	widget->InitDirect3D();
  10. 	return a.exec();
  11. }
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But this code does nothing . What should I change to gain the appropriate behavior?
I'll be glad for any advices regarding the Direct3D.