Zooming In on a Selection: Step 7

LeadBitmap.SetDstRect(&rLeadDest);   
LeadBitmap.SetClipDstRect(&rLeadDest);   
LeadBitmap.SetSrcRect(&rLeadSource);   
LeadBitmap.SetClipSrcRect(&rLeadSource);   
HDC hDC;   
hDC = ::GetDC(this->m_hWnd);   
LeadBitmap.Paint()->SetDC(hDC);   
LeadBitmap.Paint()->PaintDC();   
::ReleaseDC(this->m_hWnd, hDC); 
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LEADTOOLS Raster Imaging C++ Class Library Help