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LRESULT CCDlgDlg::DefWindowProc(UINT message, WPARAM wParam, LPARAM lParam)
{
if (message == WM_MOUSEMOVE)
{
CPoint pt = (CPoint)lParam;
CString str;
str.Format(_T("x = %d,y = %d"),pt.x,pt.y);
SetWindowText(str);
}
return CDialog::DefWindowProc(message, wParam, lParam);
}