以上界面工作基本完成現在需要輸入代碼了
雙擊窗體進入常規-聲明Public Class Form1 事件中
CODE:
Imports System.Runtime.InteropServices
Imports Microsoft.VisualBasic
Public Class Form1
<DllImport("kernel32.dll", ExactSpelling:=True)> _'調用系統參數
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 '注銷計算機
Friend Const EWX_SHUTDOWN As Integer = &H1'關閉計算機
Friend Const EWX_REBOOT As Integer = &H2'重新啟動計算機
Friend Const EWX_FORCE As Integer = &H4'關閉所有進程，注銷計算機
Friend Const EWX_POWEROFF As Integer = &H8
Friend Const EWX_FORCEIFHUNG As Integer = &H10
<StructLayout(LayoutKind.Sequential, Pack:=1)> _
'引用參數
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 '判斷語句
Dim tp As TokPriv1Luid
Dim hproc As IntPtr = GetCurrentProcess()
'調用進程值
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)) '重新啟動計算機
End Sub
Public Shared Sub PowerOff()
DoExitWin((EWX_FORCE Or EWX_POWEROFF)) '關閉計算機
End Sub
Public Shared Sub LogoOff()
DoExitWin((EWX_FORCE Or EWX_LogoFF)) '注銷計算機
End Sub
Dim entTime As Object '保存輸入時間
Dim xianzaiTime As Object '保存實時時間
Dim startTime As Object '保存開始定時時間
雙擊注銷button2按鈕輸入code:
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
LogoOff()'注銷計算機
End Sub
雙擊重新啟動按鈕button3，輸入code:
Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
Reboot()
End Sub
雙擊關閉計算機按鈕button1,輸入code:
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函數判斷輸入的時間格式
MsgBox("你所輸入的不是時間格式,!", , "錯誤")
Else
entTime = TimeValue(TextBox1.Text)
End If
Timer1.Enabled = True
'啟動定時器
Me.WindowState = System.Windows.Forms.FormWindowState.Minimized
'最小化窗體
End Sub
如圖3
雙擊timer1控件如圖4
輸入代碼：
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函數判斷是否到時間了
End If
End If
PowerOff() '關閉計算機
End Sub
好了基本上一個定時關機程序就完成了，接下來加一個超級鏈接吧！當然對於高手來說可是廢話，但是對於新手來說這也是必備的。這個超級鏈接當然是我們最喜歡的天極網開發頻道了。
先創建一個Label控件吧，把它托到窗體上，將text屬性設置為天極網開發頻道如圖5
接下來需要輸入代碼了，雙擊窗體Form1
進入Public Class Form1事件
代碼：
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
如圖6
雙擊剛才添加的label屬性text:（天極網開發頻道）中輸入以下代碼：
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
OK全部搞定，按F5鍵運行如圖7所示，選擇相應選項後點擊（關閉計算機啟動定時器按鈕）就可以了，現在程序將按照你所設定的時間而啟動關閉計算機選項。
圖7
