Switching off computer using C#

Switching off computer using C#

• Ron Park

  Thank you very much. It was very helpful.
  
  

• Ayman Shoukry - MSFT

  The .NET framework must by definition call Win32 functions, but it does not expose all the functions that exist. pInvoke fills this gap. The following is a C# class that deals with all the traps involved in shuting down the PC.

  using System;

  using System.Runtime.InteropServices;

  namespace Shutdown

  {

  /// <summary>

  /// Summary description for Shutdown.

  /// </summary>

  public class Shutdown

  {

  [StructLayout(LayoutKind.Sequential, Pack=1)]

  internal struct TokPriv1Luid

  {

  public int Count;

  public long Luid;

  public int Attr;

  }

  [DllImport("kernel32.dll", ExactSpelling=true) ]

  internal static extern IntPtr GetCurrentProcess();

  [DllImport("advapi32.dll", ExactSpelling=true, SetLastError=true) ]

  internal static extern bool OpenProcessToken( IntPtr h, int acc, ref IntPtr phtok );

  [DllImport("advapi32.dll", SetLastError=true) ]

  internal static extern bool LookupPrivilegeValue( string host, string name, ref long pluid );

  [DllImport("advapi32.dll", ExactSpelling=true, SetLastError=true) ]

  internal static extern bool AdjustTokenPrivileges( IntPtr htok, bool disall,

  ref TokPriv1Luid newst, int len, IntPtr prev, IntPtr relen );

  [DllImport("user32.dll", ExactSpelling=true, SetLastError=true) ]

  internal static extern bool ExitWindowsEx( int flg, int rea );

  internal const int SE_PRIVILEGE_ENABLED = 0x00000002;

  internal const int TOKEN_QUERY = 0x00000008;

  internal const int TOKEN_ADJUST_PRIVILEGES = 0x00000020;

  internal const string SE_SHUTDOWN_NAME = "SeShutdownPrivilege";

  internal const int EWX_LOGOFF = 0x00000000;

  internal const int EWX_SHUTDOWN = 0x00000001;

  internal const int EWX_REBOOT = 0x00000002;

  internal const int EWX_FORCE = 0x00000004;

  internal const int EWX_POWEROFF = 0x00000008;

  internal const int EWX_FORCEIFHUNG = 0x00000010;

  private static void DoExitWin( int flg )

  {

  bool ok;

  TokPriv1Luid tp;

  IntPtr hproc = GetCurrentProcess();

  IntPtr htok = IntPtr.Zero;

  ok = OpenProcessToken( hproc, TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY, ref htok );

  tp.Count = 1;

  tp.Luid = 0;

  tp.Attr = SE_PRIVILEGE_ENABLED;

  ok = LookupPrivilegeValue( null, SE_SHUTDOWN_NAME, ref tp.Luid );

  ok = AdjustTokenPrivileges( htok, false, ref tp, 0, IntPtr.Zero, IntPtr.Zero );

  ok = ExitWindowsEx( flg, 0 );

  }

  public static void ShutDown()

  {

  DoExitWin( EWX_POWEROFF | EWX_FORCE );

  }

  }

  }

  
  
  
• Switching off computer using C#