是否可以检测笔记本电脑的盖子何时打开或关闭? 据我所知,这是不可能的,但 SO 帮助我解决了以前不可能的事情。
我发现的唯一可能正确的方向是一篇 MSDN 博客文章,关于报告电源按钮所需的 IOCTL 。 是否可以在操作系统调用它们时“嗅探”它们?
我正在使用 VB.NET,但会接受任何语言的建议。 感谢您的时间和建议。
编辑:我的软件将(最终)覆盖盖子关闭时发生的操作(基于用户偏好),因此监听盖子关闭时通常发生的暂停和其他操作不是一个选项。
WPF 应用程序的完整工作 C# 代码,显示如何侦听盖子打开/关闭事件:
using System;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Windows;
using System.Windows.Interop;
namespace WpfApplication1
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
[DllImport(@"User32", SetLastError = true, EntryPoint = "RegisterPowerSettingNotification",
CallingConvention = CallingConvention.StdCall)]
private static extern IntPtr RegisterPowerSettingNotification(IntPtr hRecipient, ref Guid PowerSettingGuid,
Int32 Flags);
internal struct POWERBROADCAST_SETTING
{
public Guid PowerSetting;
public uint DataLength;
public byte Data;
}
Guid GUID_LIDSWITCH_STATE_CHANGE = new Guid(0xBA3E0F4D, 0xB817, 0x4094, 0xA2, 0xD1, 0xD5, 0x63, 0x79, 0xE6, 0xA0, 0xF3);
const int DEVICE_NOTIFY_WINDOW_HANDLE = 0x00000000;
const int WM_POWERBROADCAST = 0x0218;
const int PBT_POWERSETTINGCHANGE = 0x8013;
private bool? _previousLidState = null;
public MainWindow()
{
InitializeComponent();
this.SourceInitialized += MainWindow_SourceInitialized;
}
void MainWindow_SourceInitialized(object sender, EventArgs e)
{
RegisterForPowerNotifications();
IntPtr hwnd = new WindowInteropHelper(this).Handle;
HwndSource.FromHwnd(hwnd).AddHook(new HwndSourceHook(WndProc));
}
private void RegisterForPowerNotifications()
{
IntPtr handle = new WindowInteropHelper(Application.Current.Windows[0]).Handle;
IntPtr hLIDSWITCHSTATECHANGE = RegisterPowerSettingNotification(handle,
ref GUID_LIDSWITCH_STATE_CHANGE,
DEVICE_NOTIFY_WINDOW_HANDLE);
}
IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
{
switch (msg)
{
case WM_POWERBROADCAST:
OnPowerBroadcast(wParam, lParam);
break;
default:
break;
}
return IntPtr.Zero;
}
private void OnPowerBroadcast(IntPtr wParam, IntPtr lParam)
{
if ((int)wParam == PBT_POWERSETTINGCHANGE)
{
POWERBROADCAST_SETTING ps = (POWERBROADCAST_SETTING)Marshal.PtrToStructure(lParam, typeof(POWERBROADCAST_SETTING));
IntPtr pData = (IntPtr)((int)lParam + Marshal.SizeOf(ps));
Int32 iData = (Int32)Marshal.PtrToStructure(pData, typeof(Int32));
if (ps.PowerSetting == GUID_LIDSWITCH_STATE_CHANGE)
{
bool isLidOpen = ps.Data != 0;
if (!isLidOpen == _previousLidState)
{
LidStatusChanged(isLidOpen);
}
_previousLidState = isLidOpen;
}
}
}
private void LidStatusChanged(bool isLidOpen)
{
if (isLidOpen)
{
//Do some action on lid open event
Debug.WriteLine("{0}: Lid opened!", DateTime.Now);
}
else
{
//Do some action on lid close event
Debug.WriteLine("{0}: Lid closed!", DateTime.Now);
}
}
}
}
使用WM_POWERBROADCAST。以下链接可以为您提供帮助:盖子关闭操作更改通知
请记住,大多数笔记本电脑在合上盖子时都会按下按钮。该按钮通常只是一个睡眠按钮。 WMI 类公开 ACPI,您最好使用 PowerManagement 类。不幸的是,当操作系统设置为“不执行任何操作”时,该类不会引发事件。解决这个问题的唯一方法是使用 DDK(驱动程序开发工具包)创建一个过滤器来拦截 IOCTL_GET_SYS_BUTTON_EVENT 事件。这里有两个链接可以帮助您开始:
和
这是一个解决方案;
https://www.codeproject.com/Tips/480049/Shut-Down-Restart-Log-off-or-Lock-your-computer-in
我做到了;
using System;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Windows;
using System.Windows.Interop;
namespace WpfApplication1
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
[DllImport(@"User32", SetLastError = true, EntryPoint = "RegisterPowerSettingNotification",
CallingConvention = CallingConvention.StdCall)]
private static extern IntPtr RegisterPowerSettingNotification(IntPtr hRecipient, ref Guid PowerSettingGuid,
Int32 Flags);
internal struct POWERBROADCAST_SETTING
{
public Guid PowerSetting;
public uint DataLength;
public byte Data;
}
Guid GUID_LIDSWITCH_STATE_CHANGE = new Guid(0xBA3E0F4D, 0xB817, 0x4094, 0xA2, 0xD1, 0xD5, 0x63, 0x79, 0xE6, 0xA0, 0xF3);
const int DEVICE_NOTIFY_WINDOW_HANDLE = 0x00000000;
const int WM_POWERBROADCAST = 0x0218;
const int PBT_POWERSETTINGCHANGE = 0x8013;
private bool? _previousLidState = null;
public MainWindow()
{
InitializeComponent();
this.SourceInitialized += MainWindow_SourceInitialized;
}
void MainWindow_SourceInitialized(object sender, EventArgs e)
{
RegisterForPowerNotifications();
IntPtr hwnd = new WindowInteropHelper(this).Handle;
HwndSource.FromHwnd(hwnd).AddHook(new HwndSourceHook(WndProc));
}
private void RegisterForPowerNotifications()
{
IntPtr handle = new WindowInteropHelper(Application.Current.Windows[0]).Handle;
IntPtr hLIDSWITCHSTATECHANGE = RegisterPowerSettingNotification(handle,
ref GUID_LIDSWITCH_STATE_CHANGE,
DEVICE_NOTIFY_WINDOW_HANDLE);
}
IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
{
switch (msg)
{
case WM_POWERBROADCAST:
OnPowerBroadcast(wParam, lParam);
break;
default:
break;
}
return IntPtr.Zero;
}
private void OnPowerBroadcast(IntPtr wParam, IntPtr lParam)
{
if ((int)wParam == PBT_POWERSETTINGCHANGE)
{
POWERBROADCAST_SETTING ps = (POWERBROADCAST_SETTING)Marshal.PtrToStructure(lParam, typeof(POWERBROADCAST_SETTING));
IntPtr pData = (IntPtr)((int)lParam + Marshal.SizeOf(ps));
Int32 iData = (Int32)Marshal.PtrToStructure(pData, typeof(Int32));
if (ps.PowerSetting == GUID_LIDSWITCH_STATE_CHANGE)
{
bool isLidOpen = ps.Data != 0;
if (!isLidOpen == _previousLidState)
{
LidStatusChanged(isLidOpen);
}
_previousLidState = isLidOpen;
}
}
}
private void LidStatusChanged(bool isLidOpen)
{
if (isLidOpen)
{
//Do some action on lid open event
Debug.WriteLine("{0}: Lid opened!", DateTime.Now);
}
else
{
//Do some action on lid close event
Debug.WriteLine("{0}: Lid closed!", DateTime.Now);
}
}
}
}
合上盖子时就是锁屏。
处理省电事件 到目前为止,重点是在应用程序运行时延长电池寿命。您还应该考虑一个额外的因素:计算机挂起操作时应用程序的行为方式。这里需要考虑两个关键场景:
我希望它能给你一些指导:)
检测便携式盖子何时关闭或打开。
适用于 Windows Framework Net 4.8。
C# 代码
using System;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Windows.Forms;
namespace DetectLid
{
public partial class Form1 : Form
{
[DllImport("User32.dll", SetLastError = true, EntryPoint = "RegisterPowerSettingNotification",
CallingConvention = CallingConvention.StdCall)]
private static extern IntPtr RegisterPowerSettingNotification(IntPtr hRecipient, ref Guid PowerSettingGuid,
int Flags);
internal struct POWERBROADCAST_SETTING
{
public Guid PowerSetting;
public uint DataLength;
public byte Data;
}
Guid GUID_LIDSWITCH_STATE_CHANGE = new Guid(0xBA3E0F4D, 0xB817, 0x4094, 0xA2, 0xD1, 0xD5, 0x63, 0x79, 0xE6, 0xA0, 0xF3);
const int DEVICE_NOTIFY_WINDOW_HANDLE = 0x00000000;
const int WM_POWERBROADCAST = 0x0218;
const int PBT_POWERSETTINGCHANGE = 0x8013;
private bool? _previousLidState = null;
public Form1()
{
InitializeComponent();
this.Load += Form1_Load;
}
private void Form1_Load(object sender, EventArgs e)
{
RegisterForPowerNotifications();
}
private void RegisterForPowerNotifications()
{
IntPtr handle = this.Handle;
IntPtr hLIDSWITCHSTATECHANGE = RegisterPowerSettingNotification(handle,
ref GUID_LIDSWITCH_STATE_CHANGE,
DEVICE_NOTIFY_WINDOW_HANDLE);
}
protected override void WndProc(ref Message m)
{
switch (m.Msg)
{
case WM_POWERBROADCAST:
OnPowerBroadcast(m.WParam, m.LParam);
break;
default:
base.WndProc(ref m);
break;
}
}
private void OnPowerBroadcast(IntPtr wParam, IntPtr lParam)
{
if ((int)wParam == PBT_POWERSETTINGCHANGE)
{
POWERBROADCAST_SETTING ps = (POWERBROADCAST_SETTING)Marshal.PtrToStructure(lParam, typeof(POWERBROADCAST_SETTING));
IntPtr pData = (IntPtr)((long)lParam + Marshal.SizeOf(ps));
Int32 iData = (Int32)Marshal.PtrToStructure(pData, typeof(Int32));
if (ps.PowerSetting == GUID_LIDSWITCH_STATE_CHANGE)
{
bool isLidOpen = ps.Data != 0;
if (!isLidOpen == _previousLidState)
{
LidStatusChanged(isLidOpen);
}
_previousLidState = isLidOpen;
}
}
}
private void LidStatusChanged(bool isLidOpen)
{
if (isLidOpen)
{
//Do some action on lid open event
Debug.WriteLine("{0}: Lid opened!", DateTime.Now);
}
else
{
//Do some action on lid close event
Debug.WriteLine("{0}: Lid closed!", DateTime.Now);
}
}
}
}
VB.Net 中的代码:
Imports System.Runtime.InteropServices
Public Class Form2
<DllImport("User32.dll", SetLastError:=True, EntryPoint:="RegisterPowerSettingNotification", CallingConvention:=CallingConvention.StdCall)>
Private Shared Function RegisterPowerSettingNotification(hRecipient As IntPtr, ByRef PowerSettingGuid As Guid, Flags As Integer) As IntPtr
End Function
<StructLayout(LayoutKind.Sequential)>
Public Structure POWERBROADCAST_SETTING
Public PowerSetting As Guid
Public DataLength As UInteger
Public Data As Byte
End Structure
Private GUID_LIDSWITCH_STATE_CHANGE As New Guid("BA3E0F4D-B817-4094-A2D1-D56379E6A0F3")
Private Const DEVICE_NOTIFY_WINDOW_HANDLE As Integer = &H0
Private Const WM_POWERBROADCAST As Integer = &H218
Private Const PBT_POWERSETTINGCHANGE As Integer = &H8013
Private _previousLidState As Nullable(Of Boolean) = Nothing
Public Sub New()
InitializeComponent()
AddHandler Me.Load, AddressOf Form2_Load
End Sub
Private Sub Form2_Load(sender As Object, e As EventArgs) Handles MyBase.Load
RegisterForPowerNotifications()
End Sub
Private Sub RegisterForPowerNotifications()
Dim handle As IntPtr = Me.Handle
Dim hLIDSWITCHSTATECHANGE As IntPtr = RegisterPowerSettingNotification(handle, GUID_LIDSWITCH_STATE_CHANGE, DEVICE_NOTIFY_WINDOW_HANDLE)
End Sub
Protected Overrides Sub WndProc(ByRef m As Message)
Select Case m.Msg
Case WM_POWERBROADCAST
OnPowerBroadcast(m.WParam, m.LParam)
Case Else
MyBase.WndProc(m)
End Select
End Sub
Private Sub OnPowerBroadcast(wParam As IntPtr, lParam As IntPtr)
If CInt(wParam) = PBT_POWERSETTINGCHANGE Then
Dim ps As POWERBROADCAST_SETTING = CType(Marshal.PtrToStructure(lParam, GetType(POWERBROADCAST_SETTING)), POWERBROADCAST_SETTING)
Dim pData As IntPtr = CType(CLng(lParam) + Marshal.SizeOf(ps), IntPtr)
Dim iData As Int32 = CInt(Marshal.PtrToStructure(pData, GetType(Int32)))
If ps.PowerSetting = GUID_LIDSWITCH_STATE_CHANGE Then
Dim isLidOpen As Boolean = ps.Data <> 0
If Not isLidOpen = _previousLidState Then
LidStatusChanged(isLidOpen)
End If
_previousLidState = isLidOpen
End If
End If
End Sub
Private Sub LidStatusChanged(isLidOpen As Boolean)
If isLidOpen Then
'Do some action on lid open event
Debug.WriteLine("{0}: Lid opened!", DateTime.Now)
Else
'Do some action on lid close event
Debug.WriteLine("{0}: Lid closed!", DateTime.Now)
End If
End Sub
End Class