VC++ 限制窗口的大小范围的方法

void CMainFrame::OnGetMinMaxInfo(MINMAXINFO FAR* lpMMI) 
{
 // TODO: Add your message handler code here and/or call default
 lpMMI->ptMinTrackSize.x   = 100 ;   
   lpMMI->ptMinTrackSize.y   = 100  ;   
   lpMMI->ptMaxTrackSize.x   = 200  ;   
    lpMMI->ptMaxTrackSize.y   =  200;   

 CFrameWnd::OnGetMinMaxInfo(lpMMI);
}