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QCRenderer output to NSImage

Hi,
I am using QCRenderer class in my application. It renders image to  NSView  using 
   
 [glContext flushBuffer];

And everything works OK, but I need to get renderer output as NSImage.
First I tried to get data from NSView using data = "" dataWithPDFInRect: myViewRect] and then create NSImage from data. However data has no pixels information in it.
Then researching the web I read about glReadPixels function. So I tried this:

 NSBitmapImageRep * rep = [[NSBitmapImageRep alloc] initWithBitmapDataPlanes:NULL pixelsWide:640 pixelsHigh:480 bitsPerSample:8 samplesPerPixel:3 hasAlpha:NO isPlanar:NO colorSpaceName:NSCalibratedRGBColorSpace bytesPerRow:640*3 bitsPerPixel:24];
    glReadPixels(0,0,640,480,GL_RGB,GL_UNSIGNED_BYTE,[rep bitmapData]);

    flattenedImage = [[NSImage alloc] initWithSize:NSMakeSize(640.0,480.0)];
    [flattenedImage addRepresentation:rep];

This did not do job as well. Image is just ablack area.

Am I missing something?

Any help will be appreciated.

Thanks,

Sergei 

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