Функция для блокировки системы и смены пользователя

Imports System
Imports System.Text
Imports System.Diagnostics
Imports System.Runtime.InteropServices
 
Public Class Form1
    Dim ExitWindows As New ExitWindwos
 
    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
        ExitWindows.PowerOff() 'Выключение
    End Sub
 
    Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
        ExitWindows.Reboot() 'Перезагрузка
    End Sub
 
    Private Sub Button3_Click(sender As Object, e As EventArgs) Handles Button3.Click
        ExitWindows.Suspend() ' Сон
    End Sub
 
    Private Sub Button4_Click(sender As Object, e As EventArgs) Handles Button4.Click
        ExitWindows.Hibernate() 'Гибернация
    End Sub
 
    Private Sub Button5_Click(sender As Object, e As EventArgs) Handles Button5.Click
        ExitWindows.OutUser() 'Выйти из системы
    End Sub
End Class

Public Class ExitWindwos
    Public Enum RestartOptions
 
        PowerOff = 8 ' Выключает комп
        Reboot = 2 ' Перезагружает комп
        Suspend = -1 'Сон
        Hibernate = -2 'Гибернация
        OutUser = 4 'Выйти из системы
 
    End Enum
    Public Structure LUID
        Dim LowPart As Integer
        Dim HighPart As Integer
    End Structure
    Public Structure LUID_AND_ATTRIBUTES
        Dim pLuid As LUID
        Dim Attributes As Integer
    End Structure
    Public Structure TOKEN_PRIVILEGES
        Dim PrivilegeCount As Integer
        Dim Privileges As LUID_AND_ATTRIBUTES
    End Structure
    Private Const TOKEN_ADJUST_PRIVILEGES = &H20
    Private Const TOKEN_QUERY = &H8
    Private Const SE_PRIVILEGE_ENABLED = &H2
    Private Const FORMAT_MESSAGE_FROM_SYSTEM = &H1000
    Private Const EWX_FORCE = 4
    Private Declare Function LoadLibrary Lib "kernel32" Alias "LoadLibraryA" (ByVal lpLibFileName As String) As IntPtr
    Private Declare Function FreeLibrary Lib "kernel32" (ByVal hLibModule As IntPtr) As Integer
    Private Declare Function GetProcAddress Lib "kernel32" (ByVal hModule As IntPtr, ByVal lpProcName As String) As IntPtr
    Private Declare Function SetSuspendState Lib "Powrprof" (ByVal Hibernate As Integer, ByVal ForceCritical As Integer, ByVal DisableWakeEvent As Integer) As Integer
    Private Declare Function OpenProcessToken Lib "advapi32.dll" (ByVal ProcessHandle As IntPtr, ByVal DesiredAccess As Integer, ByRef TokenHandle As IntPtr) As Integer
    Private Declare Function LookupPrivilegeValue Lib "advapi32.dll" Alias "LookupPrivilegeValueA" (ByVal lpSystemName As String, ByVal lpName As String, ByRef lpLuid As LUID) As Integer
    Private Declare Function AdjustTokenPrivileges Lib "advapi32.dll" (ByVal TokenHandle As IntPtr, ByVal DisableAllPrivileges As Integer, ByRef NewState As TOKEN_PRIVILEGES, ByVal BufferLength As Integer, ByRef PreviousState As TOKEN_PRIVILEGES, ByRef ReturnLength As Integer) As Integer
    Private Declare Function ExitWindowsEx Lib "user32" (ByVal uFlags As Integer, ByVal dwReserved As Integer) As Integer
    Private Declare Function FormatMessage Lib "kernel32" Alias "FormatMessageA" (ByVal dwFlags As Integer, ByVal lpSource As IntPtr, ByVal dwMessageId As Integer, ByVal dwLanguageId As Integer, ByVal lpBuffer As StringBuilder, ByVal nSize As Integer, ByVal Arguments As Integer) As Integer
    Private Sub ExitWindows(ByVal how As RestartOptions, ByVal force As Boolean)
        Select Case how
            Case RestartOptions.Suspend
                SuspendSystem(False, force)
            Case RestartOptions.Hibernate
                SuspendSystem(True, force)
            Case Else
                ExitWindows(Convert.ToInt32(how), force)
        End Select
    End Sub
    Private Sub ExitWindows(ByVal how As Integer, ByVal force As Boolean)
        EnableToken("SeShutdownPrivilege")
        If force Then how = how Or EWX_FORCE
        If (ExitWindowsEx(how, 0) = 0) Then Throw New PrivilegeException(FormatError(Marshal.GetLastWin32Error()))
    End Sub
    Private Sub EnableToken(ByVal privilege As String)
        If Not CheckEntryPoint("advapi32.dll", "AdjustTokenPrivileges") Then Return
        Dim tokenHandle As IntPtr = IntPtr.Zero
        Dim privilegeLUID = New LUID
        Dim newPrivileges = New TOKEN_PRIVILEGES
        Dim tokenPrivileges As TOKEN_PRIVILEGES
        If (OpenProcessToken(Process.GetCurrentProcess().Handle, TOKEN_ADJUST_PRIVILEGES Or TOKEN_QUERY, tokenHandle)) = 0 Then Throw New PrivilegeException(FormatError(Marshal.GetLastWin32Error()))
        If (LookupPrivilegeValue("", privilege, privilegeLUID)) = 0 Then Throw New PrivilegeException(FormatError(Marshal.GetLastWin32Error()))
        tokenPrivileges.PrivilegeCount = 1
        tokenPrivileges.Privileges.Attributes = SE_PRIVILEGE_ENABLED
        tokenPrivileges.Privileges.pLuid = privilegeLUID
        Dim Size As Integer = 4
        If (AdjustTokenPrivileges(tokenHandle, 0, tokenPrivileges, 4 + (12 * tokenPrivileges.PrivilegeCount), newPrivileges, Size)) = 0 Then Throw New PrivilegeException(FormatError(Marshal.GetLastWin32Error()))
    End Sub
    Private Sub SuspendSystem(ByVal hibernate As Boolean, ByVal force As Boolean)
        If Not CheckEntryPoint("powrprof.dll", "SetSuspendState") Then Throw New PlatformNotSupportedException("The SetSuspendState method is not supported on this system!")
        SetSuspendState(Convert.ToInt32(IIf(hibernate, 1, 0)), Convert.ToInt32(IIf(force, 1, 0)), 0)
    End Sub
    Private Function CheckEntryPoint(ByVal library As String, ByVal method As String) As Boolean
        Dim libPtr As IntPtr = LoadLibrary(library)
        If Not libPtr.Equals(IntPtr.Zero) Then
            If Not GetProcAddress(libPtr, method).Equals(IntPtr.Zero) Then
                FreeLibrary(libPtr)
                Return True
            End If
            FreeLibrary(libPtr)
        End If
        Return False
    End Function
    Private Function FormatError(ByVal number As Integer) As String
        Dim Buffer = New StringBuilder(255)
        FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, IntPtr.Zero, number, 0, Buffer, Buffer.Capacity, 0)
        Return Buffer.ToString()
    End Function
    Public Sub PowerOff()
        ExitWindows(RestartOptions.PowerOff, False)
    End Sub
    Public Sub Reboot()
        ExitWindows(RestartOptions.Reboot, False)
    End Sub
    Public Sub Suspend()
        ExitWindows(RestartOptions.Suspend, False)
    End Sub
    Public Sub Hibernate()
        ExitWindows(RestartOptions.Hibernate, False)
    End Sub
    Public Sub OutUser()
        ExitWindows(RestartOptions.OutUser, False)
    End Sub
End Class
Public Class PrivilegeException
    Inherits Exception
    Public Sub New()
        MyBase.New()
    End Sub
    Public Sub New(ByVal message As String)
        MyBase.New(message)
    End Sub
End Class