try to fix #413

src/Misc/CorePlayer.cs

@@ -71,7 +71,6 @@ namespace mpvnet
         public List<KeyValuePair<string, double>> Chapters { get; set; } = new List<KeyValuePair<string, double>>();
         public List<TimeSpan> BluRayTitles { get; } = new List<TimeSpan>();
         public IntPtr Handle { get; set; }
-        public IntPtr WindowHandle { get; set; }
         
         public Size VideoSize { get; set; }
         public TimeSpan Duration;
@@ -108,7 +107,7 @@ namespace mpvnet
         public float AutofitSmaller { get; set; } = 0.3f;
         public float AutofitLarger { get; set; } = 0.8f;
 
-        public void Init()
+        public void Init(IntPtr handle)
         {
             ApplyShowMenuFix();
 
@@ -117,6 +116,8 @@ namespace mpvnet
             if (Handle == IntPtr.Zero)
                 throw new Exception("error mpv_create");
 
+            SetPropertyLong("wid", handle.ToInt64());
+
             mpv_request_log_messages(Handle, "terminal-default");
 
             App.RunTask(() => EventLoop());
@@ -128,20 +129,19 @@ namespace mpvnet
                 SetPropertyString("msg-level", "osd/libass=fatal");
             }
             
-            SetPropertyString("watch-later-options", "mute");
-            SetPropertyString("screenshot-directory", "~~desktop/");
-            SetPropertyString("osd-playing-msg", "${filename}");
-            SetPropertyString("wid", MainForm.Hwnd.ToString());
-            SetPropertyString("osc", "yes");
-            SetPropertyString("force-window", "yes");
-            SetPropertyString("config-dir", ConfigFolder);
-            SetPropertyString("config", "yes");
-
             SetPropertyInt("osd-duration", 2000);
 
             SetPropertyBool("input-default-bindings", true);
             SetPropertyBool("input-builtin-bindings", false);
 
+            SetPropertyString("watch-later-options", "mute");
+            SetPropertyString("screenshot-directory", "~~desktop/");
+            SetPropertyString("osd-playing-msg", "${filename}");
+            SetPropertyString("osc", "yes");
+            SetPropertyString("force-window", "yes");
+            SetPropertyString("config-dir", ConfigFolder);
+            SetPropertyString("config", "yes");
+
             ProcessCommandLine(true);
             mpv_error err = mpv_initialize(Handle);
 
@@ -388,9 +388,6 @@ namespace mpvnet
                 IntPtr ptr = mpv_wait_event(Handle, -1);
                 mpv_event evt = (mpv_event)Marshal.PtrToStructure(ptr, typeof(mpv_event));
 
-                if (WindowHandle == IntPtr.Zero)
-                    WindowHandle = Native.FindWindowEx(MainForm.Hwnd, IntPtr.Zero, "mpv", null);
-
                 try
                 {
                     switch (evt.event_id)
@@ -761,6 +758,14 @@ namespace mpvnet
                 HandleError(err, throwException, $"error setting property: {name} = {value}");
         }
 
+        public void SetPropertyLong(string name, long value, bool throwException = false)
+        {
+            mpv_error err = mpv_set_property(Handle, GetUtf8Bytes(name), mpv_format.MPV_FORMAT_INT64, ref value);
+
+            if (err < 0)
+                HandleError(err, throwException, $"error setting property: {name} = {value}");
+        }
+
         public long GetPropertyLong(string name, bool throwException = false)
         {
             mpv_error err = mpv_get_property(Handle, GetUtf8Bytes(name),
@@ -772,15 +777,6 @@ namespace mpvnet
             return lpBuffer.ToInt64();
         }
 
-        public void SetPropertyLong(string name, long value, bool throwException = false)
-        {
-            long val = value;
-            mpv_error err = mpv_set_property(Handle, GetUtf8Bytes(name), mpv_format.MPV_FORMAT_INT64, ref val);
-
-            if (err < 0)
-                HandleError(err, throwException, $"error setting property: {name} = {value}");
-        }
-
         public double GetPropertyDouble(string name, bool throwException = false)
         {
             mpv_error err = mpv_get_property(Handle, GetUtf8Bytes(name),

src/Misc/MainForm.cs

@@ -22,8 +22,8 @@ namespace mpvnet
     public partial class MainForm : Form
     {
         public ElementHost CommandPaletteHost { get; set; }
+        public IntPtr mpvWindowHandle { get; set; }
         public static MainForm Instance { get; set; }
-        public static IntPtr Hwnd { get; set; }
 
         new WpfControls.ContextMenu ContextMenu { get; set; }
         AutoResetEvent MenuAutoResetEvent { get; } = new AutoResetEvent(false);
@@ -44,8 +44,7 @@ namespace mpvnet
             try
             {
                 Instance = this;
-                Hwnd = Handle;
+                Core.Init(Handle);
-                Core.Init();
 
                 Core.Shutdown += Core_Shutdown;
                 Core.ShowMenu += Core_ShowMenu;
@@ -812,8 +811,11 @@ namespace mpvnet
                 case 0x20b: // WM_XBUTTONDOWN
                 case 0x20c: // WM_XBUTTONUP
                 case 0x20e: // WM_MOUSEHWHEEL
-                    if (Core.WindowHandle != IntPtr.Zero)
+                    if (mpvWindowHandle == IntPtr.Zero)
-                        m.Result = SendMessage(Core.WindowHandle, m.Msg, m.WParam, m.LParam);
+                        mpvWindowHandle = FindWindowEx(Handle, IntPtr.Zero, "mpv", null);
+
+                    if (mpvWindowHandle != IntPtr.Zero)
+                        m.Result = SendMessage(mpvWindowHandle, m.Msg, m.WParam, m.LParam);
                     break;
                 case 0x051: // WM_INPUTLANGCHANGE
                     ActivateKeyboardLayout(m.LParam, 0x00000100u /*KLF_SETFORPROCESS*/);