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Cannot access HoloLens' Camera Roll from Unity App


I am trying to access and display JPGs from the HoloLens' Camera Roll in my Unity app.

I am using this code:
imageRootDir = Windows.Storage.KnownFolders.CameraRoll.Path.ToString();
string[] filePaths = System.IO.Directory.GetFiles(imageRootDir);

imageRootDir resolves to this directory:
C:\Data\Users\sally\Pictures\Camera Roll

filePaths returns an array of length zero.

System.IO.Directory.Exists(imageRootDir) returns true.

I can see there are several images in the Camera Roll via the HoloLens file explorer. Any hint what I might be doing wrong in the Unity app?

Thank you for your support.

Best Answer


  • dbarrettdbarrett ✭✭✭
    edited December 2017

    Have you enabled the Pictures Library permission under the Player Settings?

    I have made an app the can save the photos but, I haven't tried to display them from memory as I display them as soon as I take the picture. The file path you are using is correct.

    Make sure when you are saving/calling from memory it is best to use string filePath = Path.Combine(imageRootPath, filename);

    AR Developer

  • Hey dbarrett, thank you for the reply: I do have Pictures Library enabled.

    The following are currently enabled:

    Thank you for the ideas.

  • sallysally
    edited December 2017

    Thank you dbarrett, that solved my problem! I will include some notes below which may help the next user:

    • I had to update Unity's Scripting Runtime Version to "Experimental (.NET 4.6 Equivalent)" in order to get the async/await functionality working.

    • I set up the following using statements:
      using System.Collections.Generic;
      using System;
      using Windows.Storage;
      using Windows.Storage.Search;

    • I created a function like this:
      public async void DoTest()
      StorageFolder CameraFolder = Windows.Storage.KnownFolders.CameraRoll;
      IReadOnlyList filesInFolder = await CameraFolder.GetFilesAsync();

    filesInFolder then correctly populated to a List of four items.

    Thank you for your support!

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