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C#：如何唤醒已经关闭的系统？

发布于 2024-09-29 22:58:57 字数 80 浏览 3 评论 0原文

是否有任何 Win32 API 用于在特定时间唤醒已关闭的系统？我见过一个名为 Autopower On 的程序，它能够在指定的时间打开系统电源。

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究竟谁懂我的在乎 2024-10-06 22:58:57

得到以下帖子来自某个网站。有人尝试过这个吗？

框架中没有任何内容，因此您必须“PInvoke”一下。
您需要调用的 API 是 CreateWaitableTimer 和 SetWaitableTimer。
以下是一个完整的（Q&D）示例，说明了如何设置
使用上述 Win32 API 将系统从睡眠/休眠状态唤醒。
请注意，这里我将相对唤醒时间设置为 300000000 纳秒。
这意味着计算机将被唤醒（假设他睡着了或者
设置定时器后 30 秒内休眠）。
有关 SetWaitableTimer 及其参数的详细信息，请参阅 MSDN 文档。

using System;
using System.Runtime.InteropServices;
using System.Windows.Forms;

namespace Willys
{
    class Program
    {
        [DllImport("kernel32.dll")]
        public static extern IntPtr CreateWaitableTimer(IntPtr lpTimerAttributes,
        bool bManualReset, string lpTimerName);

        [DllImport("kernel32.dll")]
        public static extern bool SetWaitableTimer(IntPtr hTimer, [In] ref long
        pDueTime, int lPeriod, IntPtr pfnCompletionRoutine, IntPtr
        lpArgToCompletionRoutine, bool fResume);

        [DllImport("kernel32", SetLastError = true, ExactSpelling = true)]
        public static extern Int32 WaitForSingleObject(IntPtr handle, uint
        milliseconds);

        static void Main()
        {
            SetWaitForWakeUpTime();
        }

        static IntPtr handle;
        static void SetWaitForWakeUpTime()
        {
            long duetime = -300000000; // negative value, so a RELATIVE due time
            Console.WriteLine("{0:x}", duetime);
            handle = CreateWaitableTimer(IntPtr.Zero, true, "MyWaitabletimer");
            SetWaitableTimer(handle, ref duetime, 0, IntPtr.Zero, IntPtr.Zero, true);
            uint INFINITE = 0xFFFFFFFF;
            int ret = WaitForSingleObject(handle, INFINITE);
            MessageBox.Show("Wake up call");
        }
    }
}

Got the below post from a site. Any body tried this?

Nothing in the framework, so you'll have to "PInvoke" a bit.
The API's you need to call are CreateWaitableTimer and SetWaitableTimer.
Following is a complete (Q&D) sample that illustrates how you can set a
system to be awoken from sleep/hibernate using above Win32 API's.
Note that here I'm setting a relative wakeup time of 300000000 nSecs.
That means that the computer will wake-up (supposing he's asleep or
hibernating) within 30 seconds after setting the timer.
Consult the MSDN docs for details on SetWaitableTimer and it's arguments.

using System;
using System.Runtime.InteropServices;
using System.Windows.Forms;

namespace Willys
{
    class Program
    {
        [DllImport("kernel32.dll")]
        public static extern IntPtr CreateWaitableTimer(IntPtr lpTimerAttributes,
        bool bManualReset, string lpTimerName);

        [DllImport("kernel32.dll")]
        public static extern bool SetWaitableTimer(IntPtr hTimer, [In] ref long
        pDueTime, int lPeriod, IntPtr pfnCompletionRoutine, IntPtr
        lpArgToCompletionRoutine, bool fResume);

        [DllImport("kernel32", SetLastError = true, ExactSpelling = true)]
        public static extern Int32 WaitForSingleObject(IntPtr handle, uint
        milliseconds);

        static void Main()
        {
            SetWaitForWakeUpTime();
        }

        static IntPtr handle;
        static void SetWaitForWakeUpTime()
        {
            long duetime = -300000000; // negative value, so a RELATIVE due time
            Console.WriteLine("{0:x}", duetime);
            handle = CreateWaitableTimer(IntPtr.Zero, true, "MyWaitabletimer");
            SetWaitableTimer(handle, ref duetime, 0, IntPtr.Zero, IntPtr.Zero, true);
            uint INFINITE = 0xFFFFFFFF;
            int ret = WaitForSingleObject(handle, INFINITE);
            MessageBox.Show("Wake up call");
        }
    }
}

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