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MFC- GetPixel doesn't work!!!

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In an SDI application I created a new Class, say, CTest. In one of the member functions of CTest I included the following code -
void CTest::SomeFunc(...)
     int x;
     int y;
  CFrameWnd* pFrame = (CFrameWnd*)(AfxGetApp()->m_pMainWnd);
  CMyAppView* pView = (CMyAppView*)(pFrame->GetActiveView());

  CClientDC dc(pView);

  COLORREF pix = dc.GetPixel(x, y);

But the function GetPixel doent return the correct value of the the pixel color at (x,y); when I debugged it pix always had the value 0xffffffff. Please help... "There is a Bug in every Code!"

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Was the view visible when you were debugging? If it was hidden by the debugger, GetPixel would return 0xffffffff.

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