在Windows NT下，你能強制本地或遠(yuǎn)程機器定時關(guān)閉。這段代碼將告訴你怎么做。你能指定系統(tǒng)關(guān)閉前的等待時間（0代表立即關(guān)閉），關(guān)閉進(jìn)程的優(yōu)先級（決定是否允許保存未完成的工作）和機器是否要重新啟動。
　　開始一個新的Project，加入一個module，然后加入一下代碼：

'判斷系統(tǒng)是否為NT：
Private Type OSVERSIONINFO
　　dwOSVersionInfoSize As Long
　　dwMajorVersion As Long
　　dwMinorVersion As Long
　　dwBuildNumber As Long
　　dwPlatformId As Long
　　szCSDVersion As String * 128 ' Maintenance string for PSS usage
End Type  
Private Declare Function GetVersionEx Lib "kernel32" Alias "GetVersionExA" (lpVersionInformation As OSVERSIONINFO) As Long
Private Const VER_PLATFORM_WIN32_NT = 2
Private Const VER_PLATFORM_WIN32_WINDOWS = 1
Private Const VER_PLATFORM_WIN32s = 0

'報告API錯誤：
Private Const FORMAT_MESSAGE_ALLOCATE_BUFFER = &H100
Private Const FORMAT_MESSAGE_ARGUMENT_ARRAY = &H2000
Private Const FORMAT_MESSAGE_FROM_HMODULE = &H800
Private Const FORMAT_MESSAGE_FROM_STRING = &H400
Private Const FORMAT_MESSAGE_FROM_SYSTEM = &H1000
Private Const FORMAT_MESSAGE_IGNORE_INSERTS = &H200
Private Const FORMAT_MESSAGE_MAX_WIDTH_MASK = &HFF
Private Declare Function FormatMessage Lib "kernel32" Alias "FormatMessageA" (ByVal dwFlags As Long, lpSource As Any, ByVal dwMessageId As Long, ByVal dwLanguageId As Long, ByVal lpBuffer As String, ByVal nSize As Long, Arguments As Long) As Long

' =====================================================================
' NT Only
Private Type LARGE_INTEGER
　　LowPart As Long
　　HighPart As Long
End Type

Private Type LUID
　　LowPart As Long
　　HighPart As Long
End Type

Private Type LUID_AND_ATTRIBUTES
　　pLuid As LUID
　　Attributes As Long
End Type

Private Type TOKEN_PRIVILEGES
　　PrivilegeCount As Long  
　　Privileges(0 To 0) As LUID_AND_ATTRIBUTES  
End Type  

Private Declare Function GetCurrentProcess Lib "kernel32" () As Long
Private Declare Function OpenProcessToken Lib "advapi32.dll" (ByVal ProcessHandle As Long, ByVal DesiredAccess As Long, TokenHandle As Long) As Long
Private Declare Function CloseHandle Lib "kernel32" (ByVal hObject As Long) As Long
Private Declare Function GetTokenInformation Lib "advapi32.dll" (ByVal TokenHandle As Long, TokenInformationClass As Integer, TokenInformation As Any, ByVal TokenInformationLength As Long, ReturnLength As Long) As Long
Private Declare Function AdjustTokenPrivileges Lib "advapi32.dll" (ByVal TokenHandle As Long, ByVal DisableAllPrivileges As Long, NewState As TOKEN_PRIVILEGES, ByVal BufferLength As Long, PreviousState As TOKEN_PRIVILEGES, ReturnLength As Long) As Long
Private Declare Function LookupPrivilegeValue Lib "advapi32.dll" Alias "LookupPrivilegeValueA" (ByVal lpSystemName As String, ByVal lpName As String, lpLuid As LUID) As Long

Private Const SE_SHUTDOWN_NAME = "SeShutdownPrivilege"
Private Const SE_PRIVILEGE_ENABLED = &H2

Private Const READ_CONTROL = &H20000
Private Const STANDARD_RIGHTS_ALL = &H1F0000
Private Const STANDARD_RIGHTS_EXECUTE = (READ_CONTROL)
Private Const STANDARD_RIGHTS_READ = (READ_CONTROL)
Private Const STANDARD_RIGHTS_REQUIRED = &HF0000
Private Const STANDARD_RIGHTS_WRITE = (READ_CONTROL)

Private Const TOKEN_ASSIGN_PRIMARY = &H1
Private Const TOKEN_DUPLICATE = (&H2)
Private Const TOKEN_IMPERSONATE = (&H4)
Private Const TOKEN_QUERY = (&H8)
Private Const TOKEN_QUERY_SOURCE = (&H10)
Private Const TOKEN_ADJUST_PRIVILEGES = (&H20)
Private Const TOKEN_ADJUST_GROUPS = (&H40)
Private Const TOKEN_ADJUST_DEFAULT = (&H80)
Private Const TOKEN_ALL_ACCESS = (STANDARD_RIGHTS_REQUIRED Or _
　　　　　　　　　　　　TOKEN_ASSIGN_PRIMARY Or _
　　　　　　　　　　　　TOKEN_DUPLICATE Or _
　　　　　　　　　　　　TOKEN_IMPERSONATE Or _
　　　　　　　　　　　　TOKEN_QUERY Or _
　　　　　　　　　　　　TOKEN_QUERY_SOURCE Or _
　　　　　　　　　　　　TOKEN_ADJUST_PRIVILEGES Or _
　　　　　　　　　　　　TOKEN_ADJUST_GROUPS Or _
　　　　　　　　　　　　TOKEN_ADJUST_DEFAULT)
Private Const TOKEN_READ = (STANDARD_RIGHTS_READ Or TOKEN_QUERY)
Private Const TOKEN_WRITE = (STANDARD_RIGHTS_WRITE Or _
　　　　　　　　　　　　TOKEN_ADJUST_PRIVILEGES Or _
　　　　　　　　　　　　TOKEN_ADJUST_GROUPS Or _
　　　　　　　　　　　　TOKEN_ADJUST_DEFAULT)
Private Const TOKEN_EXECUTE = (STANDARD_RIGHTS_EXECUTE)

Private Const TokenDefaultDacl = 6
Private Const TokenGroups = 2
Private Const TokenImpersonationLevel = 9
Private Const TokenOwner = 4
Private Const TokenPrimaryGroup = 5
Private Const TokenPrivileges = 3
Private Const TokenSource = 7
Private Const TokenStatistics = 10
Private Const TokenType = 8
Private Const TokenUser = 1

Private Declare Function InitiateSystemShutdown Lib "advapi32.dll" Alias "InitiateSystemShutdownA" (ByVal lpMachineName As String, ByVal lpMessage As String, ByVal dwTimeout As Long, ByVal bForceAppsClosed As Long, ByVal bRebootAfterShutdown As Long) As Long
Private Declare Function AbortSystemShutdown Lib "advapi32.dll" Alias "AbortSystemShutdownA" (ByVal lpMachineName As String) As Long
' ================================================================

Public Function WinError(ByVal lLastDLLError As Long) As String
Dim sBuff As String
Dim lCount As Long
　　
　　'返回與LastDLLError關(guān)聯(lián)的錯誤消息：
　　sBuff = String$(256, 0)
　　lCount = FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM Or FORMAT_MESSAGE_IGNORE_INSERTS, _  
　　　　　　　　　　　　　 0, lLastDLLError, 0&, sBuff, Len(sBuff), ByVal 0)  
　　If lCount Then  
　　　WinError = Left$(sBuff, lCount)
　　End If
　　
End Function

Public Function IsNT() As Boolean
　Static bOnce As Boolean
　Static bValue As Boolean

　　'返回系統(tǒng)是否為NT：
　　If Not (bOnce) Then
　　　Dim tVI As OSVERSIONINFO
　　　tVI.dwOSVersionInfoSize = Len(tVI)
　　　If (GetVersionEx(tVI) <> 0) Then
　　　　bValue = (tVI.dwPlatformId = VER_PLATFORM_WIN32_NT)
　　　　bOnce = True
　　　End If
　　End If
　　IsNT = bValue
End Function

Private Function NTEnableShutDown(ByRef sMsg As String) As Boolean
　Dim tLUID As LUID
　Dim hProcess As Long
　Dim hToken As Long
　Dim tTP As TOKEN_PRIVILEGES, tTPOld As TOKEN_PRIVILEGES
　Dim lTpOld As Long
　Dim lR As Long

　　'在NT下，我們必須給試圖關(guān)閉系統(tǒng)的進(jìn)程SE_SHUTDOWN_NAME特權(quán)
　　'否則，所有企圖關(guān)閉系統(tǒng)的調(diào)用都會無效！

　　'尋找Shoudown特權(quán)令牌的LUID：
　　lR = LookupPrivilegeValue(vbNullString, SE_SHUTDOWN_NAME, tLUID)
　　
　　'如果我們找到了  
　　If (lR <> 0) Then
　　　　　　　　
　　'取得當(dāng)前進(jìn)程的句柄：
　　hProcess = GetCurrentProcess()
　　If (hProcess <> 0) Then
　　　　'打開令牌來Adjust和Query（用戶可能沒有權(quán)限）
　　　　lR = OpenProcessToken(hProcess, TOKEN_ADJUST_PRIVILEGES Or TOKEN_QUERY, hToken)
　　　　If (lR <> 0) Then
　　　　　　　　　　
　　　　　　'好，我們現(xiàn)在可以調(diào)整Shutdown特權(quán)了：
　　　　　　With tTP
　　　　　　　　.PrivilegeCount = 1
　　　　　　　　With .Privileges(0)
　　　　　　　　.Attributes = SE_PRIVILEGE_ENABLED
　　　　　　　　.pLuid.HighPart = tLUID.HighPart
　　　　　　　　.pLuid.LowPart = tLUID.LowPart
　　　　　　　　End With
　　　　　　End With
　　　　　　
　　　　　　'現(xiàn)在允許這個進(jìn)程關(guān)閉系統(tǒng)：
　　　　　　lR = AdjustTokenPrivileges(hToken, 0, tTP, Len(tTP), tTPOld, lTpOld)
　　　　　　
　　　　　　If (lR <> 0) Then
　　　　　　　　NTEnableShutDown = True
　　　　　　Else
　　　　　　　　Err.Raise eeSSDErrorBase + 6, App.EXEName & ".mShutDown", "不能shutdown：你沒有關(guān)閉本系統(tǒng)的權(quán)限。[" & WinError(Err.LastDllError) & "]"
　　　　　　End If
　　　　　　
　　　　　　'記得用完后關(guān)閉這個句柄：
　　　　　　CloseHandle hToken
　　　　Else
　　　　　　Err.Raise eeSSDErrorBase + 6, App.EXEName & ".mShutDown", "不能shutdown：你沒有關(guān)閉本系統(tǒng)的權(quán)限。[" & WinError(Err.LastDllError) & "]"
　　　　End If
　　Else
　　　　Err.Raise eeSSDErrorBase + 5, App.EXEName & ".mShutDown", "不能shutdown：不能終止當(dāng)前進(jìn)程。[" & WinError(Err.LastDllError) & "]"
　　End If
　　Else
　　Err.Raise eeSSDErrorBase + 4, App.EXEName & ".mShutDown", "不能shutdown：找不到SE_SHUTDOWN_NAME特權(quán)值。[" & WinError(Err.LastDllError) & "]"
　　End If

End Function


Public Function NTForceTimedShutdown( _
　　Optional ByVal lTimeOut As Long = -1, _
　　Optional ByVal sMsg As String = "", _
　　Optional ByVal sMachineNetworkName As String = vbNullString, _
　　Optional ByVal bForceAppsToClose As Boolean = False, _
　　Optional ByVal bReboot As Boolean = False _
　　) As Boolean
　Dim lR As Long
　　
　　If IsNT Then
　　'如果我們在NT下，確信我們已經(jīng)給了這個進(jìn)程關(guān)閉系統(tǒng)的特權(quán)：
　　If Not (NTEnableShutDown(sMsg)) Then
　　　　Exit Function
　　End If
　　
　　'這是定時關(guān)閉系統(tǒng)的代碼：
　　lR = InitiateSystemShutdown(sMachineNetworkName, sMsg, lTimeOut, bForceAppsToClose, bReboot)
　　If (lR = 0) Then
　　　　Err.Raise eeSSDErrorBase + 2, App.EXEName & ".mShutDown", "InitiateSystemShutdown failed: " & WinError(Err.LastDllError)
　　End If

　　Else
　　Err.Raise eeSSDErrorBase + 1, App.EXEName & ".mShutDown", "函數(shù)僅在Windows NT下有效。"
　　End If
End Function


Public Function NTAbortTimedShutdown(Optional ByVal sMachineNetworkName As String = vbNullString)  
　AbortSystemShutdown sMachineNetworkName  
End Function  


　　為了試驗一次shutdown，在窗體上放兩個Command按鈕和一個Text，然后粘貼一下代碼。注意，你必須在運行前保存你的工作，因為Shutdown也將關(guān)閉VB且不會給你任何有關(guān)保存的詢問！
　　點擊Command1，它根據(jù)Text里的值開始一次定時關(guān)機。要終止Shutdown，點Command2。

Private Sub Command1_Click()
　　If (MsgBox("你確定要強制定時關(guān)機嗎？", vbYesNo Or vbQuestion) = vbYes) Then
　　NTForceTimedShutdown CLng(Text1.Text), "系統(tǒng)將在" & Text1.Text & "秒后關(guān)閉..."
End If
End Sub

Private Sub Command2_Click()
NTAbortTimedShutdown
End Sub

Private Sub Form_Load()
Text1.Text = 60
End Sub