[Settings] [VCM] Allow selecting a picture for VCM camera mute when running elevated (#24247)

* Fix the issue of not being able to select an image for VCM
Camera mute while PowerToys is running elevated.

* change the buffer size for Path and filename

* move DLL import to native methods file

* Adding comment to rember to move back to WinUI3
when it is fixed

* making Dll Import methods internal

* changes from comments

* fix new c# errors

* Remove async

src/settings-ui/Settings.UI/Helpers/NativeMethods.cs

@@ -44,6 +44,9 @@ namespace Microsoft.PowerToys.Settings.UI.Helpers
         [DllImport("shell32.dll")]
         internal static extern int SHGetPathFromIDListW(IntPtr pidl, IntPtr pszPath);
 
+        [DllImport("Comdlg32.dll", CharSet = CharSet.Unicode)]
+        internal static extern bool GetOpenFileName([In, Out] OpenFileName openFileName);
+
 #pragma warning disable CA1401 // P/Invokes should not be visible
         [DllImport("user32.dll")]
         public static extern bool ShowWindow(System.IntPtr hWnd, int nCmdShow);

src/settings-ui/Settings.UI/Helpers/OpenFileName.cs

@@ -0,0 +1,36 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using System.Diagnostics.CodeAnalysis;
+using System.Runtime.InteropServices;
+
+namespace Microsoft.PowerToys.Settings.UI.Helpers
+{
+    [SuppressMessage("StyleCop.CSharp.MaintainabilityRules", "SA1401:FieldsMustBePrivate", Justification = "Reviewed.")]
+    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
+    public class OpenFileName
+    {
+        public int StructSize;
+        public IntPtr Hwnd = IntPtr.Zero;
+        public IntPtr Hinst = IntPtr.Zero;
+        public string Filter;
+        public string CustFilter;
+        public int CustFilterMax;
+        public int FilterIndex;
+        public string File;
+        public int MaxFile;
+        public string FileTitle;
+        public int MaxFileTitle;
+        public string InitialDir;
+        public string Title;
+        public int Flags;
+        public short FileOffset;
+        public short FileExtMax;
+        public string DefExt;
+        public int CustData;
+        public IntPtr Hook = IntPtr.Zero;
+        public string Template;
+    }
+}

src/settings-ui/Settings.UI/ViewModels/VideoConferenceViewModel.cs

@@ -30,7 +30,7 @@ namespace Microsoft.PowerToys.Settings.UI.ViewModels
 
         private Func<string, int> SendConfigMSG { get; }
 
-        private Func<Task<string>> PickFileDialog { get; }
+        private Func<string> PickFileDialog { get; }
 
         private string _settingsConfigFileFolder = string.Empty;
 
@@ -39,7 +39,7 @@ namespace Microsoft.PowerToys.Settings.UI.ViewModels
             ISettingsRepository<GeneralSettings> settingsRepository,
             ISettingsRepository<VideoConferenceSettings> videoConferenceSettingsRepository,
             Func<string, int> ipcMSGCallBackFunc,
-            Func<Task<string>> pickFileDialog,
+            Func<string> pickFileDialog,
             string configFileSubfolder = "")
         {
             PickFileDialog = pickFileDialog;
@@ -197,11 +197,11 @@ namespace Microsoft.PowerToys.Settings.UI.ViewModels
             RaisePropertyChanged(nameof(CameraImageOverlayPath));
         }
 
-        private async void SelectOverlayImageAction()
+        private void SelectOverlayImageAction()
         {
             try
             {
-                string pickedImage = await PickFileDialog().ConfigureAwait(true);
+                string pickedImage = PickFileDialog();
                 if (pickedImage != null)
                 {
                     CameraImageOverlayPath = pickedImage;

src/settings-ui/Settings.UI/Views/VideoConference.xaml.cs

@@ -3,13 +3,12 @@
 // See the LICENSE file in the project root for more information.
 
 using System;
+using System.Runtime.InteropServices;
 using System.Threading.Tasks;
 using Microsoft.PowerToys.Settings.UI.Helpers;
 using Microsoft.PowerToys.Settings.UI.Library;
 using Microsoft.PowerToys.Settings.UI.ViewModels;
 using Microsoft.UI.Xaml.Controls;
-using Windows.Storage;
-using Windows.Storage.Pickers;
 
 namespace Microsoft.PowerToys.Settings.UI.Views
 {
@@ -17,19 +16,31 @@ namespace Microsoft.PowerToys.Settings.UI.Views
     {
         private VideoConferenceViewModel ViewModel { get; set; }
 
-        private static async Task<string> PickFileDialog()
+        private static string PickFileDialog()
         {
-            FileOpenPicker openPicker = new FileOpenPicker();
+            // this code was changed to solve the problem with WinUI3 that prevents to select a file
-            openPicker.ViewMode = PickerViewMode.Thumbnail;
+            // while running elevated, when the issue is solved in WinUI3 it should be changed back
-            openPicker.SuggestedStartLocation = PickerLocationId.PicturesLibrary;
+            OpenFileName openFileName = new OpenFileName();
-            openPicker.FileTypeFilter.Add(".jpg");
+            openFileName.StructSize = Marshal.SizeOf(openFileName);
-            openPicker.FileTypeFilter.Add(".jpeg");
+            openFileName.Filter = "Images(*.jpg,*.jpeg,*.png)\0*.jpg;*.jpeg;*.png\0";
-            openPicker.FileTypeFilter.Add(".png");
-            var hwnd = WinRT.Interop.WindowNative.GetWindowHandle(App.GetSettingsWindow());
-            WinRT.Interop.InitializeWithWindow.Initialize(openPicker, hwnd);
 
-            StorageFile file = await openPicker.PickSingleFileAsync();
+            // make buffer 65k bytes big as the MAX_PATH can be ~32k chars if long path is enable
-            return file?.Path;
+            // and unicode uses 2 bytes per character
+            openFileName.File = new string(new char[65000]);
+            openFileName.MaxFile = openFileName.File.Length;
+            openFileName.FileTitle = new string(new char[65000]);
+            openFileName.MaxFileTitle = openFileName.FileTitle.Length;
+            openFileName.InitialDir = null;
+            openFileName.Title = string.Empty;
+            openFileName.DefExt = null;
+
+            bool result = NativeMethods.GetOpenFileName(openFileName);
+            if (result)
+            {
+                return openFileName.File;
+            }
+
+            return null;
         }
 
         public VideoConferencePage()