递归下降语法分析器.txt

用VB实现windows关机 用VB实现windows关机

Option Explicit
Public Declare Function ExitWindowsEx Lib "user32" (ByVal uFlags As Long, ByVal dwReserved As Long) As Long
Public Const EWX_FORCE = 4      '强迫中止没有响应的进程
Public Const EWX_LOGOFF = 0     '中止进程，然后注销
Public Const EWX_REBOOT = 2     '重新引导系统
Public Const EWX_SHUTDOWN = 1   '关掉系统电源
Public Const TOKEN_ADJUST_PRIVILEGES = &H20
Public Const TOKEN_QUERY = &H8
Public Const SE_PRIVILEGE_ENABLED = &H2
Public Const ANYSIZE_ARRAY = 1
Public Const WM_CLOSE = &H10
Public retValue
Type LUID
lowpart As Long
highpart As Long
End Type

Type LUID_AND_ATTRIBUTES
pLuid As LUID
Attributes As Long
End Type

Type TOKEN_PRIVILEGES
PrivilegeCount As Long
Privileges(ANYSIZE_ARRAY) As LUID_AND_ATTRIBUTES
End Type

Public Declare Function GetCurrentProcess Lib "kernel32" () As Long
Public Declare Function LookupPrivilegeValue Lib "advapi32.dll" Alias "LookupPrivilegeValueA" (ByVal lpSystemName As String, ByVal lpName As String, lpLuid As LUID) As Long
Public 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
Public Declare Function OpenProcessToken Lib "advapi32.dll" (ByVal ProcessHandle As Long, ByVal DesiredAccess As Long, TokenHandle As Long) As Long

'这个函数就是用于NT关机中使用的
Sub AdjustTokenPrivilegesForNT()

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

LookupPrivilegeValue "", "SeShutdownPrivilege", tmpLuid
tkp.PrivilegeCount = 1
tkp.Privileges(0).pLuid = tmpLuid
tkp.Privileges(0).Attributes = SE_PRIVILEGE_ENABLED

AdjustTokenPrivileges hdlTokenHandle, False, tkp, Len(tkpNewButIgnored), tkpNewButIgnored, lBufferNeeded
End Sub


'Call AdjustTokenPrivilegesForNT
'retValue = ExitWindowsEx(EWX_SHUTDOWN, 0&)