用“MsgBox”做了个窗口，怎么实现按“是”电脑自动重启

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#include <GUIConstantsEx.au3>

GUICreate("关机程序",200,300)
$label=GUICtrlCreateLabel("闲人无聊",20,100,100,100)
GUICtrlSetFont(3, 16, 400, 4)
GUICtrlSetColor(3,0x2a121)
guisetstate(@sw_show)
Dim $choice  ,$box
$choice=InputBox("無聊","你可以在下面選項進行相應的操作"&"1立即重启"&@CRLF&"  2休眠"&@CRLF&"  3关机"&@CRLF&" 4待机"&@CRLF&" 5自定义关机时间")
Select
Case  $choice=1
        MsgBox(0,"提示","电脑将重启")
        Shutdown(2)
Case  $choice=2
        MsgBox(0,"提示","电脑将休眠")
        Shutdown(64)
Case $choice=3
        MsgBox(0,"提示","电脑将关机")
        Shutdown(1)
Case $choice=4
        MsgBox(0,"提示","电脑将待机")
        Shutdown(32)
Case $choice=5
        $box=InputBox("无聊","输入你要在N秒后关机的N值(秒)"&@CRLF&"不关机请不要输入")
        If $box="" Then
                MsgBox(0,"无聊","程序会退出")
        Exit
        Else
        MsgBox(0,"无聊","你的计算机将"&$box&"秒后关机")
        sleep($box*1000)
        Shutdown(1)
        EndIf
       

EndSelect

While 1
        $msg = GUIGetMsg()

        If $msg = $GUI_EVENT_CLOSE Then ExitLoop
    WEnd