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windows 關機代碼

編輯：C#入門知識

摘要：很多windows軟件涉及到自動關機功能，本文介紹2中實現windows關機功能的方法。

1. shutdown.exe
原理就是調用shutdown關機命令命令。

優點：

實現簡單。

缺點：

命令執行後會彈出一個對話框。（目前我還沒有找到取消它的方法）

C#實現代碼：

[csharp]
System.Diagnostics.Process boot_process = new System.Diagnostics.Process();
boot_process.StartInfo.FileName = "shutdown";
boot_process.StartInfo.Arguments = "/s /t 3";
boot_process.StartInfo.CreateNoWindow = true;
boot_process.StartInfo.UseShellExecute = false;
boot_process.Start();

    System.Diagnostics.Process boot_process = new System.Diagnostics.Process();
    boot_process.StartInfo.FileName = "shutdown";
    boot_process.StartInfo.Arguments = "/s /t 3";
    boot_process.StartInfo.CreateNoWindow = true;
    boot_process.StartInfo.UseShellExecute = false;
    boot_process.Start();

2. 調用windows底層函數ExitWindowsEx實現關機

BOOL ExitWindowsEx(
UINT uFlags, // 關閉參數
DWORD dwReserved // 系統保留，一般取0
);

下面會介紹一段C#的關機代碼
其中主要的函數就是ExitWindowsEx，而其他的主要是為了獲取win7系統的關機權限。

C#實現代碼：
[csharp]
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 DoFlag, 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;

    public static void DoExitWin(int DoFlag)
    {
        bool res;
        TokPriv1Luid tp;
        IntPtr hproc = GetCurrentProcess();
        IntPtr htok = IntPtr.Zero;
        res = OpenProcessToken(hproc, TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY, ref htok);
        tp.Count = 1;
        tp.Luid = 0;
        tp.Attr = SE_PRIVILEGE_ENABLED;
        res = LookupPrivilegeValue(null, SE_SHUTDOWN_NAME, ref tp.Luid);
        res = AdjustTokenPrivileges(htok, false, ref tp, 0, IntPtr.Zero, IntPtr.Zero);
        res = ExitWindowsEx(DoFlag, 0);
    }

    public static void Reboot()
    {
        DoExitWin(EWX_FORCE | EWX_REBOOT);
    }

    public static void PowerOff()
    {
        DoExitWin(EWX_FORCE | EWX_POWEROFF);
    }

    public static void LogOff()
    {
        DoExitWin(EWX_FORCE | EWX_LOGOFF);
    }
}

    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 DoFlag, 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;

        public static void DoExitWin(int DoFlag)
        {
            bool res;
            TokPriv1Luid tp;
            IntPtr hproc = GetCurrentProcess();
            IntPtr htok = IntPtr.Zero;
            res = OpenProcessToken(hproc, TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY, ref htok);
            tp.Count = 1;
            tp.Luid = 0;
            tp.Attr = SE_PRIVILEGE_ENABLED;
            res = LookupPrivilegeValue(null, SE_SHUTDOWN_NAME, ref tp.Luid);
            res = AdjustTokenPrivileges(htok, false, ref tp, 0, IntPtr.Zero, IntPtr.Zero);
            res = ExitWindowsEx(DoFlag, 0);
        }

        public static void Reboot()
        {
            DoExitWin(EWX_FORCE | EWX_REBOOT);
        }

        public static void PowerOff()
        {
            DoExitWin(EWX_FORCE | EWX_POWEROFF);
        }

        public static void LogOff()
        {
            DoExitWin(EWX_FORCE | EWX_LOGOFF);
        }
    }