Hi there,
first I have to say sorry for my english.

I' ve got this problem:
I want to change the "drawPixmap(..)" methode. I've red in the Qt-Assistant there is the class QPaintEngine, wich is pure virtual. So I must reimplement this class. I've done it. Here is the code:
the header.
Qt Code: 
  1. class MyPaintEngine : public QPaintEngine
  2. {
  3. 	//Q_OBJECT
  4.  
  5. private:
  6. 	HDC mHDC;
  7.  
  8. public:
  9. 	MyPaintEngine(PaintEngineFeatures caps = 0);
  10. 	~MyPaintEngine();
  11.  
  12. 	bool begin(QPaintDevice* pdev);
  13. 	void setHDC(const HDC& hDC); 
  14. 	void drawPixmap(const QRectF& r,const QPixmap& pm, const QRectF& sr );
  15. 	bool end();
  16. 	QPaintEngine::Type type() const;	
  17. 	void updateState(const QPaintEngineState& state );
  18. 	void drawPolygon ( const QPoint * points, int pointCount, PolygonDrawMode mode );
  19. };
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the cpp.
Qt Code: 
  1. void MyPaintEngine::drawPixmap(const QRectF& r,const QPixmap& pm, const QRectF& sr )
  2. {
  3. 	const unsigned int width(300),height(300);
  4. 	unsigned char* pixelBuffer = new unsigned char[height*width*4];
  5. 	unsigned int ii(0);
  6. 	for(int xx(0); xx<width; ++xx)
  7. 	{
  8. 		for(int yy(0); yy<height; ++yy)
  9. 		{
  10. 			pixelBuffer[ii]   = 255;
  11. 			++ii;
  12. 			pixelBuffer[ii] = 0;
  13. 			++ii;
  14. 			pixelBuffer[ii] = 0;
  15. 			++ii;
  16. 			pixelBuffer[ii] = 0;
  17. 			++ii;
  18. 		}
  19. 	}
  20. 	BITMAP bmp; 
  21. 	HDC hDCBmp(CreateCompatibleDC(mHDC));   // mHDC is a member which I set before i call this methode
  22. 	DWORD error(GetLastError());
  23. 	HBITMAP hBitmap(CreateCompatibleBitmap(mHDC,width,height));
  24. 	SelectObject (hDCBmp, hBitmap) ;
  25. 	SetBitmapBits(hBitmap,width*height*4,pixelBuffer);
  26.  
  27.  
  28. 	BitBlt(mHDC,(int)(100),(int)(100), 300,300, hDCBmp, 0,0, SRCCOPY);
  29. }
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But this doesn't work. I only get my window in the default color.
I choose this as an example, only drawing a blue rect.

Why it doesn't work?
What I have to do?
Can anybody help my please?