Use sleep mode listener to fix modern standby sleep mode issue

Author: Jack251970

Flow.Launcher.Infrastructure/NativeMethods.txt

@@ -85,5 +85,10 @@ QueryFullProcessImageName
 EVENT_OBJECT_HIDE
 EVENT_SYSTEM_DIALOGEND
 
+DEVICE_NOTIFY_SUBSCRIBE_PARAMETERS
 WM_POWERBROADCAST
-PBT_APMRESUMEAUTOMATIC
+PBT_APMRESUMEAUTOMATIC
+PBT_APMRESUMESUSPEND
+PowerRegisterSuspendResumeNotification
+PowerUnregisterSuspendResumeNotification
+DeviceNotifyCallbackRoutine

Flow.Launcher.Infrastructure/Win32Helper.cs

@@ -19,6 +19,7 @@
 using Windows.Win32;
 using Windows.Win32.Foundation;
 using Windows.Win32.Graphics.Dwm;
+using Windows.Win32.System.Power;
 using Windows.Win32.System.Threading;
 using Windows.Win32.UI.Input.KeyboardAndMouse;
 using Windows.Win32.UI.Shell.Common;
@@ -338,9 +339,6 @@ public static Point TransformPixelsToDIP(Visual visual, double unitX, double uni
         public const int SC_MAXIMIZE = (int)PInvoke.SC_MAXIMIZE;
         public const int SC_MINIMIZE = (int)PInvoke.SC_MINIMIZE;
 
-        public const int WM_POWERBROADCAST = (int)PInvoke.WM_POWERBROADCAST;
-        public const int PBT_APMRESUMEAUTOMATIC = (int)PInvoke.PBT_APMRESUMEAUTOMATIC;
-
         #endregion
 
         #region Window Handle
@@ -918,5 +916,105 @@ public static string SelectFile()
         }
 
         #endregion
+
+        #region Sleep Mode Listener
+
+        private static Action _func;
+        private static PDEVICE_NOTIFY_CALLBACK_ROUTINE _callback = null;
+        private static DEVICE_NOTIFY_SUBSCRIBE_PARAMETERS _recipient;
+        private static SafeHandle _recipientHandle;
+        private static HPOWERNOTIFY _handle = HPOWERNOTIFY.Null;
+
+        /// <summary>
+        /// Registers a listener for sleep mode events.
+        /// Inspired from: https://github.com/XKaguya/LenovoLegionToolkit
+        /// https://blog.csdn.net/mochounv/article/details/114668594
+        /// </summary>
+        /// <param name="func"></param>
+        /// <exception cref="Win32Exception"></exception>
+        public static unsafe void RegisterSleepModeListener(Action func)
+        {
+            if (_callback != null)
+            {
+                // Only register if not already registered
+                return;
+            }
+
+            _func = func;
+            _callback = new PDEVICE_NOTIFY_CALLBACK_ROUTINE(DeviceNotifyCallback);
+            _recipient = new DEVICE_NOTIFY_SUBSCRIBE_PARAMETERS()
+            {
+                Callback = _callback,
+                Context = null
+            };
+
+            _recipientHandle = new StructSafeHandle<DEVICE_NOTIFY_SUBSCRIBE_PARAMETERS>(_recipient);
+            _handle = PInvoke.PowerRegisterSuspendResumeNotification(
+                REGISTER_NOTIFICATION_FLAGS.DEVICE_NOTIFY_CALLBACK,
+                _recipientHandle,
+                out var handle) == WIN32_ERROR.ERROR_SUCCESS ?
+                new HPOWERNOTIFY(new IntPtr(handle)) :
+                HPOWERNOTIFY.Null;
+            if (_handle.IsNull)
+            {
+                throw new Win32Exception("Error registering for power notifications: " + Marshal.GetLastWin32Error());
+            }
+        }
+
+        /// <summary>
+        /// Unregisters the sleep mode listener.
+        /// </summary>
+        public static void UnregisterSleepModeListener()
+        {
+            if (!_handle.IsNull)
+            {
+                PInvoke.PowerUnregisterSuspendResumeNotification(_handle);
+                _handle = HPOWERNOTIFY.Null;
+                _func = null;
+                _callback = null;
+                _recipientHandle = null;
+            }
+        }
+
+        private static unsafe uint DeviceNotifyCallback(void* context, uint type, void* setting)
+        {
+            switch (type)
+            {
+                case PInvoke.PBT_APMRESUMEAUTOMATIC:
+                    // Operation is resuming automatically from a low-power state.This message is sent every time the system resumes
+                    _func();
+                    break;
+
+                case PInvoke.PBT_APMRESUMESUSPEND:
+                    // Operation is resuming from a low-power state.This message is sent after PBT_APMRESUMEAUTOMATIC if the resume is triggered by user input, such as pressing a key
+                    _func();
+                    break;
+            }
+
+            return 0;
+        }
+
+        private sealed class StructSafeHandle<T> : SafeHandle where T : struct
+        {
+            private readonly nint _ptr = nint.Zero;
+
+            public StructSafeHandle(T recipient) : base(nint.Zero, true)
+            {
+                var pRecipient = Marshal.AllocHGlobal(Marshal.SizeOf<T>());
+                Marshal.StructureToPtr(recipient, pRecipient, false);
+                SetHandle(pRecipient);
+                _ptr = pRecipient;
+            }
+
+            public override bool IsInvalid => handle == nint.Zero;
+
+            protected override bool ReleaseHandle()
+            {
+                Marshal.FreeHGlobal(_ptr);
+                return true;
+            }
+        }
+
+        #endregion
     }
 }

Flow.Launcher/MainWindow.xaml.cs

@@ -95,6 +95,7 @@ public MainWindow()
             UpdatePosition();
 
             InitSoundEffects();
+            RegisterSoundEffectsEvent();
             DataObject.AddPastingHandler(QueryTextBox, QueryTextBox_OnPaste);
             _viewModel.ActualApplicationThemeChanged += ViewModel_ActualApplicationThemeChanged;
         }
@@ -668,16 +669,6 @@ private IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref b
                         handled = true;
                     }
                     break;
-                case Win32Helper.WM_POWERBROADCAST: // Handle power broadcast messages
-                    // https://learn.microsoft.com/en-us/windows/win32/power/wm-powerbroadcast
-                    if (wParam.ToInt32() == Win32Helper.PBT_APMRESUMEAUTOMATIC)
-                    {
-                        // Fix for sound not playing after sleep / hibernate
-                        // https://stackoverflow.com/questions/64805186/mediaplayer-doesnt-play-after-computer-sleeps
-                        InitSoundEffects();
-                    }
-                    handled = true;
-                    break;
             }
 
             return IntPtr.Zero;
@@ -723,6 +714,47 @@ private void SoundPlay()
             }
         }
 
+        private void RegisterSoundEffectsEvent()
+        {
+            // Fix for sound not playing after sleep / hibernate for both modern standby and legacy standby
+            // https://stackoverflow.com/questions/64805186/mediaplayer-doesnt-play-after-computer-sleeps
+            try
+            {
+                Win32Helper.RegisterSleepModeListener(() =>
+                {
+                    if (Application.Current == null)
+                    {
+                        return;
+                    }
+
+                    // We must run InitSoundEffects on UI thread because MediaPlayer is a DispatcherObject
+                    if (!Application.Current.Dispatcher.CheckAccess())
+                    {
+                        Application.Current.Dispatcher.Invoke(InitSoundEffects);
+                        return;
+                    }
+
+                    InitSoundEffects();
+                });
+            }
+            catch (Exception e)
+            {
+                App.API.LogException(ClassName, "Failed to register sound effect event", e);
+            }
+        }
+
+        private static void UnregisterSoundEffectsEvent()
+        {
+            try
+            {
+                Win32Helper.UnregisterSleepModeListener();
+            }
+            catch (Exception e)
+            {
+                App.API.LogException(ClassName, "Failed to unregister sound effect event", e);
+            }
+        }
+
         #endregion
 
         #region Window Notify Icon
@@ -1447,6 +1479,7 @@ protected virtual void Dispose(bool disposing)
                     _animationSoundWMP?.Close();
                     _animationSoundWPF?.Dispose();
                     _viewModel.ActualApplicationThemeChanged -= ViewModel_ActualApplicationThemeChanged;
+                    UnregisterSoundEffectsEvent();
                 }
 
                 _disposed = true;