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c# - 打开/关闭显示电源时触发的事件

转载 作者:行者123 更新时间:2023-11-30 21:27:58 57 4
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我搜索一个事件,如果不存在,则搜索一种方法来了解屏幕是否关闭(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。
所以要么我在某个地方错了,要么就是不合适。

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

我期待一些轨道或解决方案。
问题是我不知道自己在做什么,如果你能帮我多一点就太好了。

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);
}

最佳答案

声明大部分是正确的,您只需要在收到通知时处理消息即可。

覆盖 OnHandleCreated , 以确保将窗口句柄传递给函数时有效。
覆盖 WndProc , 接收和处理 WM_POWERBROADCAST事件。请注意,Windows 8+ 中使用的 Guid 与 Window 7 中使用的不同。不多,在 Windows 8+ 中也可用 POWERBROADCAST_SETTING.Data 0x02 的值,包括 Monitor Dimmed 状态;无论如何,建议您改用此 Guid。
您可以查看 OSVersion在打电话之前 RegisterPowerSettingNotification .
此函数返回一个句柄 (IntPtr),用于调用 UnregisterPowerSettingNotification之后。

一旦您的应用程序开始处理消息,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,当系统打开/关闭或调暗显示器电源时会通知这些事件,如果您打开/关闭显示器的电源按钮则不会。

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://learn.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");
}
}

关于c# - 打开/关闭显示电源时触发的事件,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/56920822/

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