VB 如何寫程式控制電腦關機
VB 如何寫程式控制電腦關機
方法 1 :
' Call API ExitWindowsEx
' 宣告型態
Private Type LUID
LowPart As Long
HighPart As Long
End Type
Private Type LUID_AND_ATTRIBUTES
pLuid As LUID
Attributes As Long
End Type
Private Type TOKEN_PRIVILEGES
PrivilegeCount As Long
Privileges(1) As LUID_AND_ATTRIBUTES
End Type
' 宣告 API
Private Declare Function GetCurrentProcess Lib "kernel32" () As Long
Private Declare Function OpenProcessToken Lib "advapi32" _
(ByVal ProcessHandle As Long, ByVal DesiredAccess As Long, TokenHandle As Long) As Long
Private Declare Function LookupPrivilegeValue Lib "advapi32" Alias "LookupPrivilegeValueA" _
(ByVal lpSystemName As String, ByVal lpName As String, lpLuid As LUID) As Long
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 Function ExitWindowsEx Lib "user32" _
(ByVal uFlags As Long, ByVal dwReserved As Long) As Long
Private Sub Form_Load()
If Len(Environ("OS")) > 0 Then EnableShutDown
ExitWindowsEx 5, 0 ' 呼叫 API 進行關機
End Sub
Private Sub EnableShutDown()
Dim hProc As Long, hToken As Long
Dim mLUID As LUID
Dim mPriv As TOKEN_PRIVILEGES
Dim mNewPriv As TOKEN_PRIVILEGES
hProc = GetCurrentProcess()
OpenProcessToken hProc, 40, hToken
LookupPrivilegeValue "", "SeShutdownPrivilege", mLUID
mPriv.PrivilegeCount = 1
mPriv.Privileges(0).Attributes = 2
mPriv.Privileges(0).pLuid = mLUID
AdjustTokenPrivileges hToken, False, mPriv, 4 + (12 * mPriv.PrivilegeCount), _
mNewPriv, 4 + (12 * mNewPriv.PrivilegeCount)
End Sub
PS : 以上為 VB6 的 Code , 若在 VB.Net 使用需調整
================================================================
方法 2 :
' 使用 WMI 物件 進行關機
Dim objOS As Object
For Each objOS In GetObject("winmgmts:{(Shutdown)}").InstancesOf("Win32_OperatingSystem")
objOS.Win32Shutdown 5
Next
PS : objOS.Win32Shutdown 5 ' 5 可以替換成如下的參數
0 -> Log Off
4 -> Forced Log Off
1 -> Shutdown
5 -> Forced Shutdown
2 -> Reboot
6 -> Forced Reboot
8 -> Power Off
12 -> Forced Power Off
================================================================
方法 3 :
' 用Shell 函數來呼叫 WinXP ShutDown 指令
Shell "shutdown -s -f -t 0"
Syntax
shutdown [{-l|-s|-r|-a}] [-f] [-m [\\ComputerName]] [-t xx] [-c "message"] [-d[u][p]:xx:yy]
Parameters
-l : Logs off the current user, this is also the defualt. -m ComputerName takes precedence.
-s : Shuts down the local computer.
-r : Reboots after shutdown.
-a : Aborts shutdown. Ignores other parameters, except -l and ComputerName.
You can only use -a during the time-out period.
-f : Forces running applications to close.
-m [\\ComputerName] : Specifies the computer that you want to shut down.
-t xx : Sets the timer for system shutdown in xx seconds. The default is 20 seconds.
-c "message" : Specifies a message to be displayed in the Message area of the System Shutdown window.
You can use a maximum of 127 characters. You must enclose the message in quotation marks.
-d [u][p]:xx:yy : Lists the reason code for the shutdown. The following table lists the different values.
PS : Win2K 不提供 ShutDown 囉
================================================================
<< VB.Net 寫法 >>
請先加入參考 System.Management
Imports System.Management
Public Class Form1
Private Sub Button1_Click(ByVal s As Object, ByVal e As EventArgs) Handles Button1.Click
Dim mc As New ManagementClass("Win32_OperatingSystem")
mc.Scope.Options.EnablePrivileges = True
For Each mo As ManagementObject In mc.GetInstances()
mo.InvokeMethod("Win32Shutdown", New Object() {12})
Next
mc.Dispose()
End Sub
End Class
