[C#]如何獲取 S3 及 modern standby suspend resume event－翁丸的育兒筆記

最近的案子需要程式去偵測suspend resume

那這樣就要搞清楚測試機台的預設sleep模式是 S3 還是modern standby

因為偵測的方法不同

S3的方法我用的是 ↓

SystemEvents.PowerModeChanged += OnPowerChange;

private void OnPowerChange(object s, PowerModeChangedEventArgs e)
{
switch (e.Mode)
{
case PowerModes.Resume:
break;
case PowerModes.Suspend:
break;
}
}

*此法在modern standby機台無效

也就是sleep模式採用modern standby的機台

PowerChange的Event不會被Trigger

-----------------------------------------------------------------------

測試機台的sleep模式是採用modern standby

Modern Standby的方法我用的是 ↓

public MainWindow()
{ ...
this.SourceInitialized += MainWindow_SourceInitialized;

...
}

void MainWindow_SourceInitialized(object sender, EventArgs e)
{
RegisterSuspendResumeNotification();
IntPtr hwnd = new WindowInteropHelper(this).Handle;
HwndSource.FromHwnd(hwnd).AddHook(new HwndSourceHook(WndProc));
}

IntPtr hSLEEPRESUME

[DllImport(@"User32", SetLastError = true, EntryPoint = "RegisterSuspendResumeNotification", CallingConvention = CallingConvention.StdCall)]
private static extern IntPtr RegisterSuspendResumeNotification(IntPtr hRecipient, Int32 Flags);

private void RegisterSuspendResumeNotification()
{
IntPtr handle = new WindowInteropHelper(System.Windows.Application.Current.Windows[0]).Handle;
hSLEEPRESUME=RegisterSuspendResumeNotification(handle, 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_APMSUSPEND)//系統暫停執行
;
else if ((int)wParam == PBT_APMRESUMEAUTOMATIC) //喚醒
;
else if ((int)wParam == PBT_APMRESUMESUSPEND)//喚醒
;
}

* 以下文字截自Windows休眠与唤醒事件

如果系统自动起来（非人为点击操作），会发送PBT_APMRESUMEAUTOMATIC事件

如果系统因人为唤醒（鼠标、键盘、电源键），会先发送PBT_APMRESUMEAUTOMATIC事件，再发送PBT_APMRESUMESUSPEND事件（休眠唤醒事件），同时系统点亮屏幕。这时你的程序需要重新打开因为系统睡眠时关闭的文件。

-----------------------------------------------------------------------

補充：節電模式開始與關閉的提醒

Windows桌面應用現在可以在節電模式開始與關閉時進行提醒。

通過改變節能模式，應用也可以在續航方面做出一定貢獻。

GUID_POWER_SAVING_STATUS:此全新GUID與RegisterPowerSettingNotification即可實現通知功能。

原文網址：Win10桌面/手機版最深層次開發功能挖掘 https://kknews.cc/tech/n36z5o5.html

程式實作：

public MainWindow()
{ ...
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));
}

Guid GUID_POWER_SAVING_STATUS = new Guid(0xE00958C0, 0xC213, 0x4ACE, 0xAC, 0x77, 0xFE, 0xCC, 0xED, 0x2E, 0xEE, 0xA5);

const int DEVICE_NOTIFY_WINDOW_HANDLE = 0x00000000;

IntPtr hBATTERYSAVERCHANGE

private void RegisterForPowerNotifications()
{
IntPtr handle = new WindowInteropHelper(System.Windows.Application.Current.Windows[0]).Handle;
hBATTERYSAVERCHANGE = RegisterPowerSettingNotification(handle, ref GUID_POWER_SAVING_STATUS, DEVICE_NOTIFY_WINDOW_HANDLE);
}

internal struct POWERBROADCAST_SETTING
{
public Guid PowerSetting;
public uint DataLength;
public byte Data;
}

const int PBT_POWERSETTINGCHANGE = 0x8013;

private void OnPowerBroadcast(IntPtr wParam, IntPtr lParam)
{
if ((int)wParam == PBT_POWERSETTINGCHANGE)
{
POWERBROADCAST_SETTING ps = (POWERBROADCAST_SETTING)Marshal.PtrToStructure(lParam, typeof(POWERBROADCAST_SETTING));
if (ps.PowerSetting == GUID_POWER_SAVING_STATUS)
{
if (ps.Data == 0)
{
Console.WriteLine("Disable Battery Saver Mode");
IsBatSaver = false;
}
else if (ps.Data == 1)
{
Console.WriteLine("Enable Battery Saver Mode");
IsBatSaver = true;
}
}