用VB.NET 2005编写定时关机程序
http://tech.ddvip.com 2007年08月16日 社区交流
内容摘要：笔者最近在网上搜索了一些关于VB.net实现关机、重启、注销的文章，发现大多介绍的是VB.NET2003用API实现这些功能，且在XPsp2环境下无法正常的关机与注销。而对于VB.NET2005的介绍几乎没有。
图2
以上界面工作基本完成现在需要输入代码了
双击窗体进入常规-声明Public Class Form1 事件中
CODE:
Imports System.Runtime.InteropServices
Imports Microsoft.VisualBasic
Public Class Form1
<DllImport("kernel32.dll", ExactSpelling:=True)> _'调用系统参数
Friend Shared Function GetCurrentProcess() As IntPtr
End Function
<DllImport("advapi32.dll", ExactSpelling:=True, SetLastError:=True)> _
Friend Shared Function OpenProcessToken(ByVal h As IntPtr, ByVal acc As Integer, ByRef phtok As IntPtr) As Boolean
End Function
<DllImport("advapi32.dll", SetLastError:=True)> _
Friend Shared Function LookupPrivilegeValue(ByVal host As String, ByVal name As String, ByRef pluid As Long) As Boolean
End Function
<DllImport("advapi32.dll", ExactSpelling:=True, SetLastError:=True)> _
Friend Shared Function AdjustTokenPrivileges(ByVal htok As IntPtr, ByVal disall As Boolean, ByRef newst As TokPriv1Luid, ByVal len As Integer, ByVal prev As IntPtr, ByVal relen As IntPtr) As Boolean
End Function
<DllImport("user32.dll", ExactSpelling:=True, SetLastError:=True)> _
Friend Shared Function ExitWindowsEx(ByVal flg As Integer, ByVal rea As Integer) As Boolean
End Function
Friend Const SE_PRIVILEGE_ENABLED As Integer = &H2
Friend Const TOKEN_QUERY As Integer = &H8
Friend Const TOKEN_ADJUST_PRIVILEGES As Integer = &H20
Friend Const SE_SHUTDOWN_NAME As String = "SeShutdownPrivilege"
Friend Const EWX_LOGOFF As Integer = &H0 '注销计算机
Friend Const EWX_SHUTDOWN As Integer = &H1'关闭计算机
Friend Const EWX_REBOOT As Integer = &H2'重新启动计算机
Friend Const EWX_FORCE As Integer = &H4'关闭所有进程，注销计算机
Friend Const EWX_POWEROFF As Integer = &H8
Friend Const EWX_FORCEIFHUNG As Integer = &H10
<StructLayout(LayoutKind.Sequential, Pack:=1)> _
'引用参数
Friend Structure TokPriv1Luid
Public Count As Integer
Public Luid As Long
Public Attr As Integer
End Structure
Private Shared Sub DoExitWin(ByVal flg As Integer)
Dim xc As Boolean '判断语句
Dim tp As TokPriv1Luid
Dim hproc As IntPtr = GetCurrentProcess()
'调用进程值
Dim htok As IntPtr = IntPtr.Zero
xc = OpenProcessToken(hproc, TOKEN_ADJUST_PRIVILEGES Or TOKEN_QUERY, htok)
tp.Count = 1
tp.Luid = 0
tp.Attr = SE_PRIVILEGE_ENABLED
xc = LookupPrivilegeValue(Nothing, SE_SHUTDOWN_NAME, tp.Luid)
xc = AdjustTokenPrivileges(htok, False, tp, 0, IntPtr.Zero, IntPtr.Zero)
xc = ExitWindowsEx(flg, 0)
End Sub
Public Shared Sub Reboot()
DoExitWin((EWX_FORCE Or EWX_REBOOT)) '重新启动计算机
End Sub
Public Shared Sub PowerOff()
DoExitWin((EWX_FORCE Or EWX_POWEROFF)) '关闭计算机
End Sub
Public Shared Sub LogoOff()
DoExitWin((EWX_FORCE Or EWX_LOGOFF)) '注销计算机
End Sub
Dim entTime As Object '保存输入时间
Dim xianzaiTime As Object '保存实时时间
Dim startTime As Object '保存开始定时时间
来源：天极 作者：许城 责编：豆豆技术应用
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