Folder Picker Unauthorized access for Sub Directories and files in them UWP

0

I am working on a UWP application. I use the FolderPicker to select a folder on the disk. Now what I want to do is search through the entire folder and pick video files and image files and show them in a slideshow.

Below is how I use the FolderPicker to select a single folder.

FolderPicker openPicker = new FolderPicker()
{
    ViewMode = PickerViewMode.Thumbnail,
    SuggestedStartLocation = PickerLocationId.ComputerFolder
};
openPicker.FileTypeFilter.Add("*");

var SelectedFolder = await openPicker.PickSingleFolderAsync();

The problem I face is that event though I've picked the folder using the FolderPicker when I select a single file as StorageFile or a sub directory using a GetFolderFromPath() it throws an UnAuthorizedAccessException

System.UnauthorizedAccessException: 'Access is denied. (Exception from HRESULT: 0x80070005 (E_ACCESSDENIED))'

Below is how I access both of them:

StorageFolder accessFolder = StorageFolder.GetFolderFromPathAsync(SelectedFolder.Path + "\\subDir1\\subDir2").AsTask().GetAwaiter().GetResult(); // throws the exception

StorageFile file = accessFolder.GetFileAsync("DummyMediaFile.mp4").AsTask().GetAwaiter().GetResult(); // also throws the exception
c#
uwp
asked on Stack Overflow Feb 11, 2020 by iam.Carrot

1 Answer

1

There are two ways to achieve your purpose:

1. Use broadFileSystemAccess capability.

Please refer to the end of this document to add the broadFileSystemAccess capability to the package.appxmanifest file.

Looks like this:

<Package
  ...
  xmlns:rescap="http://schemas.microsoft.com/appx/manifest/foundation/windows10/restrictedcapabilities"
  IgnorableNamespaces="uap mp uap5 rescap">
...
<Capabilities>
    <rescap:Capability Name="broadFileSystemAccess" />
</Capabilities>

Then find your application in Settings -> Application, click and select Advanced Settings, open the File system.

After that your code can be executed smoothly.

2. Don't use paths to access folders

Although the path is a relatively simple way, in UWP, it is not allowed to directly access files or folders by path. You need to use the following method:

StorageFolder accessFolder = await (await SelectedFolder.GetFolderAsync("subDir1")).GetFolderAsync("subDir2");
StorageFile file = await accessFolder.GetFileAsync("DummyMediaFile.mp4");

Note, please use this method when confirming the above file or folder name is valid, otherwise please use CreateFolderAsync("name", CreationCollisionOption.OpenIfExists)

Best regards.


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