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void CListImageCtrl::OnMouseMove(UINT nFlags, CPoint point)
{
HDC hDC = ::GetDC(NULL); //1.这个是获得整个屏幕的dc
HDC hDcT = GetDC();//2.或者GetDC(GetSafeHwnd())
COLORREF clr = GetPixel(hDC, 20, 20);
COLORREF clr2 = GetPixel(hDCT, 20, 20);
}