Imports System.Runtime.InteropServices
Imports Microsoft.VisualBasic
Public Class Form1 
 _'调用系统参数
Friend Shared Function GetCurrentProcess() As IntPtr
End Function
_
Friend Shared Function OpenProcessToken(ByVal h As IntPtr,
ByVal acc As Integer, ByRef phtok As IntPtr) As Boolean
End Function
_
Friend Shared Function LookupPrivilegeValue(ByVal host As String,
ByVal name As String, ByRef pluid As Long) As Boolean
End Function
_
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
_
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
_
　 '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

Private Sub Button2_Click(ByVal sender As System.Object, 
 
 ByVal e As System.EventArgs) Handles Button2.Click
LogoOff()'注销计算机
End Sub
 

Private Sub Button3_Click(ByVal sender As System.Object,
ByVal e As System.EventArgs) Handles Button3.Click
Reboot()
End Sub

Private Sub Button1_Click(ByVal sender As System.Object,
ByVal e As System.EventArgs) Handles Button1.Click
　startTime = TimeOfDay
　If Not IsDate(TextBox1.Text) Then
'用IsData函数判断输入的时间格式
MsgBox("你所输入的不是时间格式,!", , "错误")
　Else
entTime = TimeValue(TextBox1.Text)
　End If
　Timer1.Enabled = True
　'启动定时器
　Me.WindowState = System.Windows.Forms.FormWindowState.Minimized
　'最小化窗体
End Sub

Private Sub Timer1_Tick(ByVal sender As System.Object,
ByVal e As System.EventArgs) Handles Timer1.Tick
　xianzaiTime = TimeOfDay
　If RadioButton1.Checked Then
　If DateDiff(Microsoft.VisualBasic.DateInterval.Second,
xianzaiTime, entTime) < 0 Then '用DateDiff函数判断是否到时间了
　End If
End If
PowerOff() '关闭计算机
End Sub

Private Declare Function ShellExecute Lib "shell32.dll" 
 
 Alias "ShellExecuteA"(ByVal hwngnd As Integer, 
 
 ByVal lpOperation As String, ByVal lpFile As String, 
 
 ByVal lpParameters As String, ByVal lpDirectory As String, 
 
 ByVal nShowCmd As Integer) As Integer
 

Private Sub Label3_Click(ByVal sender As System.Object,
ByVal e As System.EventArgs) Handles Label3.Click
ShellExecute(0, "open", "http://dev.yesky.com ", CStr(0), CStr(0), 1)
End Sub
End Class