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定义函数：

afx_msg LRESULT OnNcHitTest(CPoint pt);

消息映射：

BEGIN_MESSAGE_MAP(CMy57projectDlg, CDialog)
    ON_WM_NCHITTEST()
END_MESSAGE_MAP()

函数实现：

LRESULT CMy57projectDlg::OnNcHitTest(CPoint pt)
{
CRect rc;
GetClientRect(&rc);
ClientToScreen(&rc);
return rc.PtInRect(pt) ? HTCAPTION : CDialog::OnNcHitTest(pt);
}