support added to force single instance

Changelog.md

@@ -5,6 +5,9 @@
 - the help and layout in the config editor was improved
 - clipboard monitoring for URLs can be disabled in the settings
 - internal refactoring that might break features, scripts or extensions
+- the context menu has a new feature: Open > Add files to playlist,
+  it appends files to the playlist [(Default binding)](https://github.com/stax76/mpv.net/blob/master/mpv.net/Resources/inputConf.txt#L34)
+- a new feature was added to force using a single mpv.net process instance
 
 ### 4.1
 

mpv.net/Misc/Command.cs

@@ -7,6 +7,8 @@ using System.Reflection;
 using System.Windows.Forms;
 using System.Windows.Interop;
 
+using VB = Microsoft.VisualBasic;
+
 namespace mpvnet
 {
     public class Command
@@ -46,7 +48,7 @@ namespace mpvnet
             MainForm.Instance.Invoke(new Action(() => {
                 using (var d = new OpenFileDialog() { Multiselect = true })
                     if (d.ShowDialog() == DialogResult.OK)
-                        mp.LoadFiles(d.FileNames);
+                        mp.Load(d.FileNames);
             }));
         }
 
@@ -181,9 +183,9 @@ namespace mpvnet
         public static void execute_mpv_command(string[] args)
         {
             MainForm.Instance.Invoke(new Action(() => {
-                string command = Microsoft.VisualBasic.Interaction.InputBox("Enter a mpv command to be executed.", "Execute Command", RegistryHelp.GetString("HKCU\\Software\\" + Application.ProductName, "RecentExecutedCommand"));
+                string command = VB.Interaction.InputBox("Enter a mpv command to be executed.", "Execute Command", RegistryHelp.GetString(App.RegPath, "RecentExecutedCommand"));
                 if (string.IsNullOrEmpty(command)) return;
-                RegistryHelp.SetObject("HKCU\\Software\\" + Application.ProductName, "RecentExecutedCommand", command);
+                RegistryHelp.SetObject(App.RegPath, "RecentExecutedCommand", command);
                 mp.command_string(command, false);
             }));
         }
@@ -191,9 +193,9 @@ namespace mpvnet
         public static void open_url(string[] args)
         {
             MainForm.Instance.Invoke(new Action(() => {
-                string command = Microsoft.VisualBasic.Interaction.InputBox("Enter URL to be opened.");
+                string command = VB.Interaction.InputBox("Enter URL to be opened.");
                 if (string.IsNullOrEmpty(command)) return;
-                mp.LoadFiles(command);
+                mp.Load(command);
             }));
         }
 

mpv.net/Misc/Misc.cs

@@ -18,6 +18,7 @@ namespace mpvnet
     public class App
     {
         public static string ConfFilePath { get; } = mp.ConfFolder + "\\mpvnet.conf";
+        public static string RegPath { get; } = "HKCU\\Software\\" + Application.ProductName;
         public static string ClipboardMonitoring { get; set; } = "yes";
 
         public static string[] VideoTypes    { get; } = "mkv mp4 mpg avi mov webm vob wmv flv avs 264 h264 asf webm mpeg mpv y4m avc hevc 265 h265 m2v m2ts vpy mts m4v".Split(' ');
@@ -25,6 +26,7 @@ namespace mpvnet
         public static string[] SubtitleTypes { get; } = "srt ass idx sup ttxt ssa smi".Split(' ');
 
         public static string DarkMode { get; set; } = "always";
+        public static string ProcessInstance { get; set; } = "single";
 
         public static bool IsDarkMode { 
             get => (DarkMode == "system" && Sys.IsDarkTheme) || DarkMode == "always";
@@ -57,12 +59,9 @@ namespace mpvnet
         {
             switch (name)
             {
-                case "dark-mode":
+                case "clipboard-monitoring": ClipboardMonitoring = value; break;
-                    DarkMode = value;
+                case "process-instance": ProcessInstance = value; break;
-                    break;
+                case "dark-mode": DarkMode = value; break;
-                case "clipboard-monitoring":
-                    ClipboardMonitoring = value;
-                    break;
             }
         }
 
@@ -363,4 +362,15 @@ namespace mpvnet
                 Math.Abs(screenPos.Y - Control.MousePosition.Y) > 10;
         }
     }
+
+    public class SingleProcess
+    {
+        public static int Message { get; } = RegisterWindowMessage("mpvnet_IPC");
+
+        [DllImport("user32.dll", CharSet = CharSet.Unicode)]
+        static extern int RegisterWindowMessage(string id);
+
+        [DllImport("user32.dll")]
+        public static extern bool AllowSetForegroundWindow(int dwProcessId);
+    }
 }

mpv.net/Misc/Program.cs

@@ -1,5 +1,10 @@
 using System;
 using System.Windows.Forms;
+using System.Linq;
+using System.Collections.Generic;
+using System.IO;
+using System.Threading;
+using System.Diagnostics;
 
 namespace mpvnet
 {
@@ -8,15 +13,43 @@ namespace mpvnet
         [STAThread]
         static void Main()
         {
+            Mutex mutex = new Mutex(true, "mpvnetProcessInstance", out bool isFirst);
+
             try
             {
-                string[] args = Environment.GetCommandLineArgs();
+                string[] args = Environment.GetCommandLineArgs().Skip(1).ToArray();
 
-                if (args.Length == 3 && args[1] == "--reg-file-assoc")
+                if (args.Length == 2 && args[0] == "--reg-file-assoc")
                 {
-                    if (args[2] == "audio") FileAssociation.Register(App.AudioTypes);
+                    if (args[1] == "audio") FileAssociation.Register(App.AudioTypes);
-                    if (args[2] == "video") FileAssociation.Register(App.VideoTypes);
+                    if (args[1] == "video") FileAssociation.Register(App.VideoTypes);
-                    if (args[2] == "unreg") FileAssociation.Unregister();
+                    if (args[1] == "unreg") FileAssociation.Unregister();
+                    return;
+                }
+
+                App.Init();
+
+                if ((App.ProcessInstance == "single" || App.ProcessInstance == "queue") && !isFirst)
+                {
+                    List<string> files = new List<string>();
+
+                    foreach (string arg in args)
+                        if (!arg.StartsWith("--") && (File.Exists(arg) || arg == "-" || arg.StartsWith("http")))
+                            files.Add(arg);
+
+                    if (files.Count > 0)
+                        RegistryHelp.SetObject(App.RegPath, "ShellFiles", files.ToArray());
+
+                    RegistryHelp.SetObject(App.RegPath, "ProcessInstanceMode", App.ProcessInstance);
+
+                    foreach(Process process in Process.GetProcessesByName("mpvnet"))
+                    {
+                        try {
+                            SingleProcess.AllowSetForegroundWindow(process.Id);
+                            Native.SendMessage(process.MainWindowHandle, SingleProcess.Message, IntPtr.Zero, IntPtr.Zero);
+                        } catch {}
+                    }
+
                     return;
                 }
 
@@ -28,6 +61,10 @@ namespace mpvnet
             {
                 Msg.ShowException(ex);
             }
+            finally
+            {
+                mutex.Dispose();
+            }
         }
     }
 }

mpv.net/Resources/inputConf.txt

@@ -26,12 +26,13 @@
 
  o           script-message mpv.net open-files #menu: Open > Open Files...
  u           script-message mpv.net open-url   #menu: Open > Open URL...
- Ctrl+S      script-message mpv.net show-media-search #menu: Open > Show media search...
  _           ignore                            #menu: Open > -
  Alt+a       script-message mpv.net load-audio #menu: Open > Load external audio files...
  Alt+s       script-message mpv.net load-sub   #menu: Open > Load external subtitle files...
  _           ignore                            #menu: Open > -
  _           script-message mpv.net add-files-to-playlist #menu: Open > Add files to playlist...
+ Ctrl+S      script-message mpv.net show-media-search #menu: Open > Show media search...
+ _           ignore                            #menu: Open > -
  _           ignore                            #menu: Open > Recent
 
  _           ignore                 #menu: -
@@ -138,7 +139,7 @@
  F8     show-text ${playlist}   5000              #menu: View > Show Playlist
  F9     show-text ${track-list} 5000              #menu: View > Show Audio/Video/Subtitle List
 
- Ctrl+c script-message mpv.net show-conf-editor   #menu: Settings > Show Config Editor
+ c      script-message mpv.net show-conf-editor   #menu: Settings > Show Config Editor
  Ctrl+i script-message mpv.net show-input-editor  #menu: Settings > Show Input Editor
  Ctrl+f script-message mpv.net open-conf-folder   #menu: Settings > Open Config Folder
 

mpv.net/Resources/mpvNetConfToml.txt

@@ -13,4 +13,13 @@ default = "yes"
 filter = "mpv.net"
 help = "Monitors the clipboard for URLs to play."
 options = [{ name = "yes" },
-           { name = "no" }]
+           { name = "no" }]
+
+[[settings]]
+name = "process-instance"
+default = "single"
+filter = "mpv.net"
+help = "Defines if more then one mpv.net process is allowed."
+options = [{ name = "multi",  help = "Create a new process everytime the shell starts mpv.net" },
+           { name = "single", help = "Force a single process everytime the shell starts mpv.net" },
+		   { name = "queue",  help = "Force a single process and add files to playlist" }]

mpv.net/WPF/EverythingWindow.xaml.cs

@@ -113,7 +113,7 @@ namespace mpvnet
         void Execute()
         {
             if (ListView.SelectedItem != null)
-                mp.LoadFiles(ListView.SelectedItem as string);
+                mp.Load(ListView.SelectedItem as string);
             Keyboard.Focus(FilterTextBox);
         }
 

mpv.net/WinForms/MainForm.cs

@@ -35,13 +35,12 @@ namespace mpvnet
                 Msg.SupportURL = "https://github.com/stax76/mpv.net#support";
                 Instance = this;
                 WPF.WPF.Init();
-                App.Init();
                 System.Windows.Application.Current.ShutdownMode = System.Windows.ShutdownMode.OnExplicitShutdown;
                 Hwnd = Handle;
                 MinimumSize = new Size(FontHeight * 16, FontHeight * 9);
                 Text += " " + Application.ProductVersion;
 
-                object recent = RegistryHelp.GetObject("HKCU\\Software\\" + Application.ProductName, "Recent");
+                object recent = RegistryHelp.GetObject(App.RegPath, "Recent");
 
                 if (recent is string[] r)
                     RecentFiles = new List<string>(r);
@@ -153,7 +152,7 @@ namespace mpvnet
                 recent.DropDownItems.Clear();
 
                 foreach (string path in RecentFiles)
-                    MenuItem.Add(recent.DropDownItems, path, () => mp.LoadFiles(path));
+                    MenuItem.Add(recent.DropDownItems, path, () => mp.Load(path));
 
                 recent.DropDownItems.Add(new ToolStripSeparator());
                 MenuItem mi = new MenuItem("Clear List");
@@ -376,6 +375,31 @@ namespace mpvnet
                     m.Result = new IntPtr(1);
                     return;
             }
+
+            if (m.Msg == SingleProcess.Message)
+            {
+                object filesObject = RegistryHelp.GetObject(App.RegPath, "ShellFiles");
+
+                if (filesObject is string[] files)
+                {
+                    switch (RegistryHelp.GetString(App.RegPath, "ProcessInstanceMode"))
+                    {
+                        case "single":
+                            mp.Load(files);
+                            break;
+                        case "queue":
+                            foreach (string file in files)
+                                if (File.Exists(file))
+                                    mp.commandv("loadfile", file, "append");
+                            break;
+                    }
+                }
+
+                RegistryHelp.RemoveValue(App.RegPath, "ShellFiles");
+                Activate();
+                return;
+            }
+
             base.WndProc(ref m);
         }
 
@@ -390,9 +414,9 @@ namespace mpvnet
         {
             base.OnDragDrop(e);
             if (e.Data.GetDataPresent(DataFormats.FileDrop))
-                mp.LoadFiles(e.Data.GetData(DataFormats.FileDrop) as String[]);
+                mp.Load(e.Data.GetData(DataFormats.FileDrop) as String[]);
             if (e.Data.GetDataPresent(DataFormats.Text))
-                mp.LoadFiles(e.Data.GetData(DataFormats.Text).ToString());
+                mp.Load(e.Data.GetData(DataFormats.Text).ToString());
         }
 
         protected override void OnMouseDown(MouseEventArgs e)
@@ -474,7 +498,7 @@ namespace mpvnet
             BuildMenu();
             ContextMenuStrip = ContextMenu;
             IgnoreDpiChanged = false;
-            CheckURL();
+            CheckURLinClipboard();
         }
 
         protected override void OnResize(EventArgs e)
@@ -486,7 +510,7 @@ namespace mpvnet
         protected override void OnFormClosed(FormClosedEventArgs e)
         {
             base.OnFormClosed(e);
-            RegistryHelp.SetObject("HKCU\\Software\\" + Application.ProductName, "Recent", RecentFiles.ToArray());
+            RegistryHelp.SetObject(App.RegPath, "Recent", RecentFiles.ToArray());
             mp.commandv("quit");
             mp.AutoResetEvent.WaitOne(3000);
         }
@@ -500,20 +524,20 @@ namespace mpvnet
         protected override void OnActivated(EventArgs e)
         {
             base.OnActivated(e);
-            CheckURL();
+            CheckURLinClipboard();
         }
 
-        void CheckURL()
+        void CheckURLinClipboard()
         {
             if (App.ClipboardMonitoring != "yes") return;
             string clipboard = Clipboard.GetText();
 
-            if (clipboard.StartsWith("http") && RegistryHelp.GetString("HKCU\\Software\\" + Application.ProductName, "LastURL") != clipboard && Visible)
+            if (clipboard.StartsWith("http") && RegistryHelp.GetString(App.RegPath, "LastURL") != clipboard && Visible)
             {
-                RegistryHelp.SetObject("HKCU\\Software\\" + Application.ProductName, "LastURL", clipboard);
+                RegistryHelp.SetObject(App.RegPath, "LastURL", clipboard);
 
                 if (Msg.ShowQuestion("Play URL?", clipboard) == MsgResult.OK)
-                    mp.LoadFiles(clipboard);
+                    mp.Load(clipboard);
             }
         }
     }

mpv.net/mpv/mp.cs

@@ -531,15 +531,15 @@ namespace mpvnet
 
             foreach (string i in args)
             {
-                if (!i.StartsWith("--") && File.Exists(i) || i == "-" || i.StartsWith("http"))
+                if (!i.StartsWith("--") && (File.Exists(i) || i == "-" || i.StartsWith("http")))
                 {
                     files.Add(i);
                     if (i.StartsWith("http"))
-                        RegistryHelp.SetObject("HKCU\\Software\\" + Application.ProductName, "LastURL", i);
+                        RegistryHelp.SetObject(App.RegPath, "LastURL", i);
                 }
             }
 
-            mp.LoadFiles(files.ToArray());
+            mp.Load(files.ToArray());
 
             foreach (string i in args)
             {
@@ -557,7 +557,7 @@ namespace mpvnet
             }
         }
 
-        public static void LoadFiles(params string[] files)
+        public static void Load(params string[] files)
         {
             if (files is null || files.Length == 0) return;
             HideLogo();