重载CMainFrame类的OnGetMinMaxInfo（）函数，
void CMainFrame::OnGetMinMaxInfo(MINMAXINFO*
lpMMI)
{
lpMMI->ptMaxTrackSize.x = 735;
lpMMI->ptMaxTrackSize.y
= 650;
lpMMI->ptMinTrackSize.x = 735;
lpMMI->ptMinTrackSize.y =
650;
CFrameWnd::OnGetMinMaxInfo(lpMMI);
}
原文：http://www.cnblogs.com/chenzuoyou/p/3581704.html