Cannot access protected member declared in class 'CWnd'

[Jeff0803]

I'm trying to add a message handler for WM_NCHITTEST but following error occur.

Here is the code snippet.


//header file
afx_msg LRESULT OnNcHitTest(CPoint point);




//source file
BEGIN_MESSAGE_MAP (CMainWindow, CWnd)
......
ON_WM_NCHITTEST ()
END_MESSAGE_MAP ()

LRESULT CMainWindow::OnNcHitTest (CPoint point)
{
LRESULT nHitTest = CFrameWnd::OnNcHitTest (point);
if (nHitTest == HTCLIENT)
nHitTest = HTCAPTION;
return nHitTest;
}



Compile error occurs at following line.

LRESULT nHitTest = CFrameWnd::OnNcHitTest (point);

Error messag is

error C2248: 'CWnd::OnNcHitTest' : cannot access protected member declared in class 'CWnd'

Can anybody give me any advice?

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