作者chinoyan (chino)
看板Visual_Basic
标题Re: [VB6 ] 强制关机
时间Sun Mar 11 15:07:49 2007
※ 引述《kucal (乖小孩)》之铭言：
: 有一个很基本的问题想请教一下板上的大大们
: 有没有任何指令可以强制关机而不显示任何讯息呢
: 心得笔记中教的是显示出关机对话窗 可是小弟想直接将整台电脑关掉
: 不知有何方法
如何让 Windows(95 及 NT) 重新开机？
原始来源:王国荣
Windows 95 重新开机十分简单，只要呼叫 ExitWindowsEx API 函数就可以了， 例如：
API 宣告式:
Private Declare Function ExitWindowsEx Lib "user32" (ByVal uFlags As Long , _
ByVal dwReserved As Long) As Long
Private Enum HowExitConst
EWX_LOGOFF = 0 ' 登出
EWX_REBOOT = 2 ' 重开机
EWX_SHUTDOWN = 1 ' 关机
EWX_FORCE = 4 ' 强制关机
End Enum
呼叫叙述：
Call ExitWindowsEx(how, 0)
' how 等於 EWX_LOGOFF 、 EWX_REBOOT 、EWX_SHUTDOWN 、 或EWX_FORCE
但是这个方法并不能对 NT 关机或重新开机， 原因是 NT 比较着重安全性(Security)，
而为了让 NT 关机或重新开机， 则必须在呼叫 ExitWindowsEx 之前， 呼叫
AdjustToken 副程式就对了。
AdjustToken 副程式的细节如下：
1. API 的宣告：
Enum HowExitConst
EWX_FORCE = 4 ' 强制关机
EWX_LOGOFF = 0 ' 登出
EWX_REBOOT = 2 ' 重开机
EWX_SHUTDOWN = 1 ' 关机
End Enum
Const TOKEN_ADJUST_PRIVILEGES = &H20
Const TOKEN_QUERY = &H8
Const SE_PRIVILEGE_ENABLED = &H2
Const ANYSIZE_ARRAY = 1
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(ANYSIZE_ARRAY) As LUID_AND_ATTRIBUTES
End Type
Private Declare Function ExitWindowsEx Lib "user32" (ByVal uFlags As Long, _
ByVal dwReserved As Long) As Long
Private Declare Function GetCurrentProcess Lib "kernel32" () 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 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 OpenProcessToken Lib "advapi32.dll" _
(ByVal ProcessHandle As Long, ByVal DesiredAccess As Long, _
TokenHandle As Long) As Long
2. AdjustToken 副程式：
Private Sub AdjustToken()
Dim hdlProcessHandle As Long
Dim hdlTokenHandle As Long
Dim tmpLuid As LUID
Dim tkp As TOKEN_PRIVILEGES
Dim tkpNewButIgnored As TOKEN_PRIVILEGES
Dim lBufferNeeded As Long
hdlProcessHandle = GetCurrentProcess()
OpenProcessToken hdlProcessHandle,(TOKEN_ADJUST_PRIVILEGES Or TOKEN_QUERY), _
hdlTokenHandle
'Get the LUID for shutdown privilege.
LookupPrivilegeValue "","SeShutdownPrivilege", tmpLuid
tkp.PrivilegeCount = 1 ' One privilege to set
tkp.Privileges(0).pLuid = tmpLuid
tkp.Privileges(0).Attributes = SE_PRIVILEGE_ENABLED
'Enable the shutdown privilege in the access token of this process.
AdjustTokenPrivileges hdlTokenHandle, False, tkp, Len(tkpNewButIgnored), _
tkpNewButIgnored, lBufferNeeded
End Sub
3. 呼叫的范例：
AdjustToken
Call ExitWindowsEx(how, 0)
'how 等於 EWX_LOGOFF 、 EWX_REBOOT 、 EWX_SHUTDOWN、 或EWX_FORCE
在 Windows 95 底下呼叫了 AdjustToken 也没关系，因为 Windows 95 并不会
理会安全性的设定。
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