Код на BCB, думаю, поймешь

Для выключения компьютера под управлением Windows XP (и вообще любой ОС из линейки NT) можно воспользоваться следующим кодом:

HANDLE hToken;

TOKEN_PRIVILEGES* NewState;

OpenProcessToken (GetCurrentProcess (), TOKEN_ADJUST_PRIVILEGES, &hToken);

NewState = (TOKEN_PRIVILEGES*) malloc (sizeof (TOKEN_PRIVILEGES) + sizeof (LUID_AND_ATTRIBUTES));

NewState->PrivilegeCount = 1;

LookupPrivilegeValue (NULL, SE_SHUTDOWN_NAME, &NewState->Privileges[0].Luid);

NewState->Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;

AdjustTokenPrivileges (hToken, FALSE, NewState, NULL, NULL, NULL);

free (NewState);

CloseHandle (hToken);

ExitWindowsEx (EWX_REBOOT, 0);

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Вот, через тот же WindowsEX:

'In a module

Private Const EWX_LOGOFF = 0

Private Const EWX_SHUTDOWN = 1

Private Const EWX_REBOOT = 2

Private Const EWX_FORCE = 4

Private Const TOKEN_ADJUST_PRIVILEGES = &H20

Private Const TOKEN_QUERY = &H8

Private Const SE_PRIVILEGE_ENABLED = &H2

Private Const ANYSIZE_ARRAY = 1

Private Const VER_PLATFORM_WIN32_NT = 2

Type OSVERSIONINFO

dwOSVersionInfoSize As Long

dwMajorVersion As Long

dwMinorVersion As Long

dwBuildNumber As Long

dwPlatformId As Long

szCSDVersion As String * 128

End Type

Type LUID

LowPart As Long

HighPart As Long

End Type

Type LUID_AND_ATTRIBUTES

pLuid As LUID

Attributes As Long

End Type

Type TOKEN_PRIVILEGES

PrivilegeCount As Long

Privileges(ANYSIZE_ARRAY) As LUID_AND_ATTRIBUTES

End Type

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 Declare Function GetVersionEx Lib "kernel32" Alias "GetVersionExA" (ByRef lpVersionInformation As OSVERSIONINFO) As Long

'Detect if the program is running under Windows NT

Public Function IsWinNT() As Boolean

Dim myOS As OSVERSIONINFO

myOS.dwOSVersionInfoSize = Len(myOS)

GetVersionEx myOS

IsWinNT = (myOS.dwPlatformId = VER_PLATFORM_WIN32_NT)

End Function

'set the shut down privilege for the current application

Private Sub EnableShutDown()

Dim hProc As Long

Dim hToken As Long

Dim mLUID As LUID

Dim mPriv As TOKEN_PRIVILEGES

Dim mNewPriv As TOKEN_PRIVILEGES

hProc = GetCurrentProcess()

OpenProcessToken hProc, TOKEN_ADJUST_PRIVILEGES + TOKEN_QUERY, hToken

LookupPrivilegeValue "", "SeShutdownPrivilege", mLUID

mPriv.PrivilegeCount = 1

mPriv.Privileges(0).Attributes = SE_PRIVILEGE_ENABLED

mPriv.Privileges(0).pLuid = mLUID

' enable shutdown privilege for the current application

AdjustTokenPrivileges hToken, False, mPriv, 4 + (12 * mPriv.PrivilegeCount), mNewPriv, 4 + (12 * mNewPriv.PrivilegeCount)

End Sub

' Shut Down NT

Public Sub ShutDownNT(Force As Boolean)

Dim ret As Long

Dim Flags As Long

Flags = EWX_SHUTDOWN

If Force Then Flags = Flags + EWX_FORCE

If IsWinNT Then EnableShutDown

ExitWindowsEx Flags, 0

End Sub

'Restart NT

Public Sub RebootNT(Force As Boolean)

Dim ret As Long

Dim Flags As Long

Flags = EWX_REBOOT

If Force Then Flags = Flags + EWX_FORCE

If IsWinNT Then EnableShutDown

ExitWindowsEx Flags, 0

End Sub

'Log off the current user

Public Sub LogOffNT(Force As Boolean)

Dim ret As Long

Dim Flags As Long

Flags = EWX_LOGOFF

If Force Then Flags = Flags + EWX_FORCE

ExitWindowsEx Flags, 0

End Sub

'In a form

'This project needs a form with three command buttons

Private Sub Command1_Click()

LogOffNT True

End Sub

Private Sub Command2_Click()

RebootNT True

End Sub

Private Sub Command3_Click()

ShutDownNT True

End Sub

Private Sub Form_Load()

'KPD-Team 2000

'URL: http://www.allapi.net/

'E-Mail: KPDTeam@Allapi.net

Command1.Caption = "Log Off NT"

Command2.Caption = "Reboot NT"

Command3.Caption = "Shutdown NT"

End Sub

И понимать ничего не надо...

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