form1.frm

vb 时钟,供初学者参考,如有欠缺,请及时予以批评指正,谢谢!

VERSION 5.00
Begin VB.Form Form1 
   BorderStyle     =   0  'None
   Caption         =   "Form1"
   ClientHeight    =   360
   ClientLeft      =   11715
   ClientTop       =   3825
   ClientWidth     =   3375
   BeginProperty Font 
      Name            =   "宋体"
      Size            =   10.5
      Charset         =   134
      Weight          =   400
      Underline       =   0   'False
      Italic          =   0   'False
      Strikethrough   =   0   'False
   EndProperty
   Icon            =   "Form1.frx":0000
   LinkTopic       =   "Form1"
   Picture         =   "Form1.frx":0742
   ScaleHeight     =   360
   ScaleWidth      =   3375
   ShowInTaskbar   =   0   'False
   WhatsThisHelp   =   -1  'True
   Begin VB.CommandButton Command3 
      Caption         =   "注销"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   9
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   375
      Left            =   0
      Picture         =   "Form1.frx":F0D4
      Style           =   1  'Graphical
      TabIndex        =   5
      Top             =   0
      Width           =   495
   End
   Begin VB.CommandButton Command2 
      Caption         =   "确定"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   9
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   375
      Left            =   2040
      TabIndex        =   4
      Top             =   0
      Visible         =   0   'False
      Width           =   495
   End
   Begin VB.TextBox Text1 
      BeginProperty DataFormat 
         Type            =   1
         Format          =   "H:mm:ss"
         HaveTrueFalseNull=   0
         FirstDayOfWeek  =   0
         FirstWeekOfYear =   0
         LCID            =   2052
         SubFormatType   =   4
      EndProperty
      Height          =   375
      Left            =   600
      TabIndex        =   3
      Text            =   "设置关机时间"
      Top             =   0
      Visible         =   0   'False
      Width           =   1455
   End
   Begin VB.Timer Timer1 
      Interval        =   100
      Left            =   2520
      Top             =   0
   End
   Begin VB.CommandButton Command1 
      Caption         =   "关机"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   9
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   375
      Left            =   2880
      Picture         =   "Form1.frx":1DA66
      Style           =   1  'Graphical
      TabIndex        =   1
      Top             =   0
      Width           =   495
   End
   Begin VB.Label Label2 
      BackStyle       =   0  'Transparent
      DragMode        =   1  'Automatic
      Height          =   375
      Left            =   120
      TabIndex        =   2
      Top             =   0
      Visible         =   0   'False
      Width           =   1215
   End
   Begin VB.Label Label1 
      Alignment       =   2  'Center
      Appearance      =   0  'Flat
      BackColor       =   &H80000005&
      BackStyle       =   0  'Transparent
      BorderStyle     =   1  'Fixed Single
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   12
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      ForeColor       =   &H80000008&
      Height          =   360
      Left            =   480
      TabIndex        =   0
      ToolTipText     =   "点击设置关机时间"
      Top             =   0
      Width           =   2415
   End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Option Explicit

Private Const EWX_LogOff As Long = 0
Private Const EWX_SHUTDOWN As Long = 1
Private Const EWX_REBOOT As Long = 2
Private Const EWX_FORCE As Long = 4
Private Const EWX_POWEROFF As Long = 8

'The ExitWindowsEx function either logs off, shuts down, or shuts
'down and restarts the system.
Private Declare Function ExitWindowsEx Lib "user32" _
                (ByVal dwOptions As Long, _
                ByVal dwReserved As Long) As Long

'The GetLastError function returns the calling thread's last-error
'code value. The last-error code is maintained on a per-thread basis.
'Multiple threads do not overwrite each other's last-error code.
Private Declare Function GetLastError Lib "kernel32" () As Long

Private Type LUID
   UsedPart As Long
   IgnoredForNowHigh32BitPart As Long
End Type

Private Type LUID_AND_ATTRIBUTES
   TheLuid As LUID
   Attributes As Long
End Type

Private Type TOKEN_PRIVILEGES
   PrivilegeCount As Long
   TheLuid As LUID
   Attributes As Long
End Type

'The GetCurrentProcess function returns a pseudohandle for the
'current process.
Private Declare Function GetCurrentProcess Lib "kernel32" () As Long

'The OpenProcessToken function opens the access token associated with
'a process.
Private Declare Function OpenProcessToken Lib "advapi32" _
   (ByVal ProcessHandle As Long, _
    ByVal DesiredAccess As Long, _
    TokenHandle As Long) As Long

'The LookupPrivilegeValue function retrieves the locally unique
'identifier (LUID) used on a specified system to locally represent
'the specified privilege name.
Private Declare Function LookupPrivilegeValue Lib "advapi32" _
   Alias "LookupPrivilegeValueA" _
   (ByVal lpSystemName As String, _
    ByVal lpName As String, _
    lpLuid As LUID) As Long

'The AdjustTokenPrivileges function enables or disables privileges
'in the specified access token. Enabling or disabling privileges
'in an access token requires TOKEN_ADJUST_PRIVILEGES access.
Private Declare Function AdjustTokenPrivileges Lib "advapi32" _
   (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 Sub SetLastError Lib "kernel32" _
   (ByVal dwErrCode As Long)

Private Const mlngWindows95 = 0
Private Const mlngWindowsNT = 1

Public glngWhichWindows32 As Long

'The GetVersion function returns the operating system in use.
Private Declare Function GetVersion Lib "kernel32" () As Long

Private Sub AdjustToken()
'********************************************************************
'* This procedure sets the proper privileges to allow a log off or a
'* shut down to occur under Windows NT.
'********************************************************************

   Const TOKEN_ADJUST_PRIVILEGES = &H20
   Const TOKEN_QUERY = &H8
   Const SE_PRIVILEGE_ENABLED = &H2

   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

   'Set the error code of the last thread to zero using the
   'SetLast Error function. Do this so that the GetLastError
   'function does not return a value other than zero for no
   'apparent reason.
   SetLastError 0

   'Use the GetCurrentProcess function to set the hdlProcessHandle
   'variable.
   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.TheLuid = tmpLuid
   tkp.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

Private Sub Command1_Click()
   Dim msg As Integer
   msg = MsgBox("应用程序准备关闭计算机！", vbOKCancel + vbExclamation, "警告")
If msg = vbCancel Then Exit Sub
 If glngWhichWindows32 = mlngWindowsNT Then
        AdjustToken
   End If
  ExitWindowsEx (EWX_SHUTDOWN Or EWX_FORCE Or EWX_POWEROFF), 0
End Sub

Private Sub Command2_Click()
Label2.Caption = Text1.Text
Command2.Visible = False
Text1.Visible = False
End Sub

Private Sub Command3_Click()
Dim msg As Integer
   msg = MsgBox("确定要注销吗", vbOKCancel + vbExclamation, "警告")
If msg = vbCancel Then Exit Sub
If glngWhichWindows32 = mlngWindowsNT Then
        AdjustToken
   End If
  ExitWindowsEx EWX_LogOff, 0
End Sub

Private Sub Form_Load()
Dim lngVersion As Long

    lngVersion = GetVersion()

    If ((lngVersion And &H80000000) = 0) Then
        glngWhichWindows32 = mlngWindowsNT
    Else
        glngWhichWindows32 = mlngWindows95
    End If
End Sub
Private Sub Label1_Click()
Text1.Visible = True
Command2.Visible = True
End Sub



Private Sub Text1_Click()
Text1.Text = ""
End Sub

Private Sub Timer1_Timer()
Label1.Caption = Time + Date
Label2.Caption = Time
If Label2.Caption = Text1.Text Then
   Dim msg As Integer
   msg = MsgBox("应用程序准备关闭计算机！", vbOKCancel + vbExclamation, "警告")
   If msg = vbCancel Then Exit Sub
   If glngWhichWindows32 = mlngWindowsNT Then
        AdjustToken
   End If
  ExitWindowsEx (EWX_SHUTDOWN Or EWX_FORCE Or EWX_POWEROFF), 0
End If
End Sub