Feature: Display prompt when user doesn't have permission to access a folder (#10174)

Author: puppetsw

src/Files.App/Strings/en-US/Resources.resw

@@ -2841,6 +2841,9 @@
   <data name="DeleteShortcutDescription" xml:space="preserve">
     <value>The target destination cannot be found {0}. Do you want to delete this shortcut?</value>
   </data>
+  <data name="AccessDeniedToFolder" xml:space="preserve">
+    <value>You don't have permission to access this folder.</value>
+  </data>
   <data name="LoadingThemes" xml:space="preserve">
     <value>Loading Themes</value>
   </data>

src/Files.App/ViewModels/ItemViewModel.cs

@@ -34,6 +34,7 @@
 using System.Linq;
 using System.Net;
 using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
 using System.Text;
 using System.Text.Json;
 using System.Threading;
@@ -1478,10 +1479,9 @@ public async Task<int> EnumerateItemsFromStandardFolderAsync(string path, Cancel
 				}
 				else if (res == FileSystemStatusCode.Unauthorized)
 				{
-					//TODO: proper dialog
 					await DialogDisplayHelper.ShowDialogAsync(
 						"AccessDenied".GetLocalizedResource(),
-						"SubDirectoryAccessDenied".GetLocalizedResource());
+						"AccessDeniedToFolder".GetLocalizedResource());
 					return -1;
 				}
 				else if (res == FileSystemStatusCode.NotFound)
@@ -1531,13 +1531,13 @@ await DialogDisplayHelper.ShowDialogAsync(
 			}
 			else
 			{
-				(IntPtr hFile, WIN32_FIND_DATA findData) = await Task.Run(() =>
+				(IntPtr hFile, WIN32_FIND_DATA findData, int errorCode) = await Task.Run(() =>
 				{
 					FINDEX_INFO_LEVELS findInfoLevel = FINDEX_INFO_LEVELS.FindExInfoBasic;
 					int additionalFlags = FIND_FIRST_EX_LARGE_FETCH;
 					IntPtr hFileTsk = FindFirstFileExFromApp(path + "\\*.*", findInfoLevel, out WIN32_FIND_DATA findDataTsk, FINDEX_SEARCH_OPS.FindExSearchNameMatch, IntPtr.Zero,
 						additionalFlags);
-					return (hFileTsk, findDataTsk);
+					return (hFileTsk, findDataTsk, hFileTsk.ToInt64() == -1 ? Marshal.GetLastWin32Error() : 0);
 				}).WithTimeoutAsync(TimeSpan.FromSeconds(5));
 
 				var itemModifiedDate = DateTime.Now;
@@ -1584,6 +1584,17 @@ await DialogDisplayHelper.ShowDialogAsync(
 				else if (hFile.ToInt64() == -1)
 				{
 					await EnumFromStorageFolderAsync(path, currentFolder, rootFolder, currentStorageFolder, cancellationToken);
+					if (!filesAndFolders.Any())
+					{
+						// https://learn.microsoft.com/en-us/windows/win32/debug/system-error-codes--0-499-
+						if (errorCode == 0x5) // ERROR_ACCESS_DENIED
+						{
+							await DialogDisplayHelper.ShowDialogAsync(
+								"AccessDenied".GetLocalizedResource(),
+								"AccessDeniedToFolder".GetLocalizedResource());
+							return -1;
+						}
+					}
 					return 1;
 				}
 				else