[vtkusers] Please help me: How get pixel data after Render()

[Renaud Isabelle]

I'm got really crazy. I don't manage to use double buffering in order to avoid flickering on screen.
 
I'm using ImageSliceViewer to render a 2D slice of my 3D image on screen. It works well without double buffering except for flickering on screen.
 
I have already use double buffering in MFC and I have a class CMemDC that works fine to use memory buffering. 
 
-> All I need is a method to get the pixel data of my 2D slice displayed on screen.Then I can use it to create a DIB Bitmap from what is rendered off screen.  
 
I found the example of rendering in MFC and I tried the series of instructions:
 
this->window->SetupMemoryRendering(x,y,hdc);
this->window->Render();
StretchBlt(dc,0,0,x,y,memDC,0,0,x,y,SRCCOPY);
this->window->ResumeScreenRendering();
 
but all is displayed is a white page. Especially because during process, unsigned char* MemoryData should be NULL.
 
Please help me. 
 
 
 

		
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