打开/关闭显示器电源时触发的事件

问题描述

我搜索事件，如果不存在，则搜索一种了解屏幕是否关闭的方法(电源选项-控制面板-关闭显示设置)。

这些解决方案都不适合我。
所以要么是我搞错了，要么就是不合适。

How to get the events when the screen/display goes to power OFF or ON?

我希望有一些跟踪或解决方案。
问题是，我不知道我在做什么，如果你能再帮我一点忙，那就太好了。

我做了这个，但它不起作用：

internal static class NativeMethods
{
    public static Guid GUID_MONITOR_POWER_ON = new Guid(0x02731015, 0x4510, 0x4526, 0x99, 0xE6, 0xE5, 0xA1, 0x7E, 0xBD, 0x1A, 0xEA);
    public const int DEVICE_NOTIFY_WINDOW_HANDLE = 0x00000000;
    public const int WM_POWERBROADCAST = 0x0218;
    public const int PBT_POWERSETTINGCHANGE = 0x8013;

    [StructLayout(LayoutKind.Sequential, Pack = 4)]
    public struct POWERBROADCAST_SETTING
    {
        public Guid PowerSetting;
        public uint DataLength;
        public byte Data;
    }

    [DllImport(@"User32", SetLastError = true, EntryPoint = "RegisterPowerSettingNotification", CallingConvention = CallingConvention.StdCall)]
    public static extern IntPtr RegisterPowerSettingNotification(IntPtr hRecipient, ref Guid PowerSettingGuid, Int32 Flags);

    [DllImport(@"User32", SetLastError = true, EntryPoint = "UnregisterPowerSettingNotification", CallingConvention = CallingConvention.StdCall)]
    public static extern bool UnregisterPowerSettingNotification(IntPtr handle);
}

private void WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
{
    Debug.WriteLine("EVENT", "DEBUG");
}

public form1()
{
    NativeMethods.RegisterPowerSettingNotification(this.Handle, ref NativeMethods.GUID_MONITOR_POWER_ON, NativeMethods.DEVICE_NOTIFY_WINDOW_HANDLE);
}

推荐答案

声明大部分正确，您只需在收到通知时处理消息。

重写OnHandleCreated，以确保将窗口句柄传递给函数时窗口句柄有效。
重写WndProc，以接收和处理WM_POWERBROADCAST事件。请注意，Windows 8+中使用的GUID与Windows 7中使用的不同。不多，在Windows 8+中还提供POWERBROADCAST_SETTING.Data值0x02，包括Monitor Dimmed状态；但无论如何，建议您改用此指南。
您可以在调用RegisterPowerSettingNotification之前查看OSVersion。
此函数返回一个句柄(IntPtr)，用于在UnregisterPowerSettingNotification之后调用。

应用程序一开始处理消息，就会发送第一个通知(您应该会收到一条消息，通知您监视器已打开：)。
请注意，这些事件在系统打开/关闭或调暗显示电源时通知，而不是在您打开/关闭监视器的电源按钮时通知。

public partial class Form1 : Form
{
    private IntPtr unRegPowerNotify = IntPtr.Zero;

    protected override void OnHandleCreated(EventArgs e)
    {
        base.OnHandleCreated(e);
        var settingGuid = new NativeMethods.PowerSettingGuid();
        Guid powerGuid = IsWindows8Plus()
                       ? settingGuid.ConsoleDisplayState 
                       : settingGuid.MonitorPowerGuid;

        unRegPowerNotify = NativeMethods.RegisterPowerSettingNotification(
            this.Handle, powerGuid, NativeMethods.DEVICE_NOTIFY_WINDOW_HANDLE);
    }

    private bool IsWindows8Plus()
    {
        var version = Environment.OSVersion.Version;
        if (version.Major > 6) return true; // Windows 10+
        if (version.Major == 6 && version.Minor > 1) return true; // Windows 8+
        return false;  // Windows 7 or less
    }

    protected override void WndProc(ref Message m)
    {
        switch (m.Msg) {
            case NativeMethods.WM_POWERBROADCAST:
                if (m.WParam == (IntPtr)NativeMethods.PBT_POWERSETTINGCHANGE)
                {
                    var settings = (NativeMethods.POWERBROADCAST_SETTING)m.GetLParam(
                        typeof(NativeMethods.POWERBROADCAST_SETTING));
                    switch (settings.Data) {
                        case 0:
                            Console.WriteLine("Monitor Power Off");
                            break;
                        case 1:
                            Console.WriteLine("Monitor Power On");
                            break;
                        case 2:
                            Console.WriteLine("Monitor Dimmed");
                            break;
                    }
                }
                m.Result = (IntPtr)1;
                break;
        }
        base.WndProc(ref m);
    }

    protected override void OnFormClosing(FormClosingEventArgs e)
    {
        NativeMethods.UnregisterPowerSettingNotification(unRegPowerNotify);
        base.OnFormClosing(e);
    }
}

NativeMethods声明：

using System.Runtime.InteropServices;

public class NativeMethods
{
    internal const uint DEVICE_NOTIFY_WINDOW_HANDLE = 0x0;
    internal const uint DEVICE_NOTIFY_SERVICE_HANDLE = 0x1;
    internal const int WM_POWERBROADCAST = 0x0218;
    internal const int PBT_POWERSETTINGCHANGE = 0x8013;

    [DllImport("User32.dll", SetLastError = true)]
    internal static extern IntPtr RegisterPowerSettingNotification(IntPtr hWnd, [In] Guid PowerSettingGuid, uint Flags);

    [DllImport("User32.dll", SetLastError = true)]
    internal static extern bool UnregisterPowerSettingNotification(IntPtr hWnd);

    [StructLayout(LayoutKind.Sequential, Pack = 4)]
    internal struct POWERBROADCAST_SETTING
    {
        public Guid PowerSetting;
        public uint DataLength;
        public byte Data;
    }

    // https://docs.microsoft.com/en-us/windows/win32/power/power-setting-guids
    public class PowerSettingGuid
    {
        // 0=Powered by AC, 1=Powered by Battery, 2=Powered by short-term source (UPC)
        public Guid AcdcPowerSource { get; } = new Guid("5d3e9a59-e9D5-4b00-a6bd-ff34ff516548");
        // POWERBROADCAST_SETTING.Data = 1-100
        public Guid BatteryPercentageRemaining { get; } = new Guid("a7ad8041-b45a-4cae-87a3-eecbb468a9e1");
        // Windows 8+: 0=Monitor Off, 1=Monitor On, 2=Monitor Dimmed
        public Guid ConsoleDisplayState { get; } = new Guid("6fe69556-704a-47a0-8f24-c28d936fda47");
        // Windows 8+, Session 0 enabled: 0=User providing Input, 2=User Idle
        public Guid GlobalUserPresence { get; } = new Guid("786E8A1D-B427-4344-9207-09E70BDCBEA9");
        // 0=Monitor Off, 1=Monitor On.
        public Guid MonitorPowerGuid { get; } = new Guid("02731015-4510-4526-99e6-e5a17ebd1aea");
        // 0=Battery Saver Off, 1=Battery Saver On.
        public Guid PowerSavingStatus { get; } = new Guid("E00958C0-C213-4ACE-AC77-FECCED2EEEA5");

        // Windows 8+: 0=Off, 1=On, 2=Dimmed
        public Guid SessionDisplayStatus { get; } = new Guid("2B84C20E-AD23-4ddf-93DB-05FFBD7EFCA5");

        // Windows 8+, no Session 0: 0=User providing Input, 2=User Idle
        public Guid SessionUserPresence { get; } = new Guid("3C0F4548-C03F-4c4d-B9F2-237EDE686376");
        // 0=Exiting away mode 1=Entering away mode
        public Guid SystemAwaymode { get; } = new Guid("98a7f580-01f7-48aa-9c0f-44352c29e5C0");

        /* Windows 8+ */
        // POWERBROADCAST_SETTING.Data not used
        public Guid IdleBackgroundTask { get; } = new Guid(0x515C31D8, 0xF734, 0x163D, 0xA0, 0xFD, 0x11, 0xA0, 0x8C, 0x91, 0xE8, 0xF1);

        public Guid PowerSchemePersonality { get; } = new Guid(0x245D8541, 0x3943, 0x4422, 0xB0, 0x25, 0x13, 0xA7, 0x84, 0xF6, 0x79, 0xB7);

        // The Following 3 Guids are the POWERBROADCAST_SETTING.Data result of PowerSchemePersonality
        public Guid MinPowerSavings { get; } = new Guid("8c5e7fda-e8bf-4a96-9a85-a6e23a8c635c");
        public Guid MaxPowerSavings { get; } = new Guid("a1841308-3541-4fab-bc81-f71556f20b4a");
        public Guid TypicalPowerSavings { get; } = new Guid("381b4222-f694-41f0-9685-ff5bb260df2e");
    }
}

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