How to get thumbnails from PNG files?

Hong 1,211

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StorageItemThumbnail sit = await storageFileImage.GetThumbnailAsync(ThumbnailMode.PicturesView);

The above code works fine with JPG files but throws the following error for PNG files:

System.Exception: Exception from HRESULT: 0x80270301
Stack Trace:
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() + 0x21
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task) + 0x70
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task) + 0x38
at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task) + 0x17

Could anyone offer a tip on how to get thumbnails of PNG files?

Nico Zhu (Shanghai Wicresoft Co,.Ltd.) 12,866 Reputation points

2022-02-21T02:55:01.803+00:00

I tried to get image thumbnail with png file, but I can't reproduce your problem, can you share your image or reproduce sample?

Hong 1,211

    FileOpenPicker fop = new FileOpenPicker();
    fop.ViewMode = PickerViewMode.List;
    fop.SuggestedStartLocation = PickerLocationId.ComputerFolder;
    fop.FileTypeFilter.Add(".jpg");
    fop.FileTypeFilter.Add(".jpeg");
    fop.FileTypeFilter.Add(".png");
    fop.FileTypeFilter.Add(".bmp");
    fop.FileTypeFilter.Add(".gif");
    var file = await fop.PickSingleFileAsync();
    StorageItemThumbnail sit = await file.GetThumbnailAsync(ThumbnailMode.PicturesView);

Thank you for trying to lend a hand here. Could you try the above code with the file Butterfly.png provided by Castroix31?

Nico Zhu (Shanghai Wicresoft Co,.Ltd.) 12,866 Reputation points

2022-02-21T03:45:16.403+00:00

Ok, I will test it then comment below, please wait a moment.
Nico Zhu (Shanghai Wicresoft Co,.Ltd.) 12,866 Reputation points

2022-02-21T07:05:05.17+00:00

I run above code, it could return correct thumbnail
Hong 1,211 Reputation points

2022-02-21T14:06:32.273+00:00

Thank you. I reran the code again and got the same exception:

What could be the cause for the difference between your environment and mine?
Nico Zhu (Shanghai Wicresoft Co,.Ltd.) 12,866 Reputation points

2022-02-22T01:22:50.867+00:00

it may related with your operating system, can you reproduce this problem in other machine?
Hong 1,211 Reputation points

2022-02-22T02:04:27.477+00:00

I tried on another PC and it worked. That PC has exactly the same version of Windows 10 (Build 19042,526)

What could be the difference between these two PCs that explains this?
Nico Zhu (Shanghai Wicresoft Co,.Ltd.) 12,866 Reputation points

2022-02-22T02:11:25.773+00:00

It's hard to say, you may changed some regedit cause this problem, it will out of UWP scope.
Hong 1,211 Reputation points

2022-02-22T02:24:38.93+00:00

According to app analytics, this error is fairly common (NOT most users experience this, but it is reported from users frequently).
Nico Zhu (Shanghai Wicresoft Co,.Ltd.) 12,866 Reputation points

2022-02-22T02:34:37.38+00:00

ok, I got it, can you tried to call this api in ui-thread manually ?
Hong 1,211 Reputation points

2022-02-22T02:51:08.407+00:00

Do you want me to make sure this API is called from a UI thread? It is called in a button click listener. Does the listener use a UI thread?

1 answer

Castorix31 84,281 Reputation points

2022-02-20T19:59:58.093+00:00
Like in the other thread, it works fine for me, with this .PNG for testing : Butterfly.png
(Windows 10 21H1, VS 2022)

Test

// Path = "E:\\Sources\\UWP_Test2\\UWP_Test2\\bin\\x86\\Debug\\AppX" Windows.Storage.StorageFolder storageFolder = Windows.ApplicationModel.Package.Current.InstalledLocation; // Windows.Storage.ApplicationData.Current.LocalFolder; Windows.Storage.StorageFile storageFileImage = await storageFolder.GetFileAsync("Butterfly.png"); Windows.Storage.FileProperties.StorageItemThumbnail siThumbnail = await storageFileImage.GetThumbnailAsync(Windows.Storage.FileProperties.ThumbnailMode.PicturesView, 300, Windows.Storage.FileProperties.ThumbnailOptions.UseCurrentScale);

When I debug :
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1 person found this answer helpful.
Hong 1,211 Reputation points

2022-02-20T20:21:57.583+00:00

@Castorix31
Thanks a lot for lending a hand here. I tried your file but still got the same error:

Here is the complete code:

Every JPG files works and every PNG file fails for thumbnail, however, every PNG file obtained with the above code works perfectly otherwise (it has all of its other properties valid and it can be read and displayed).

Castorix31 84,281 Reputation points

2022-02-20T20:59:51.317+00:00

Or if you can test in C++ with one of the Shell interfaces (cannot work in UWP, just to check if a .PNG can be converted to Thumbnail)

Test PNG Thumbnail

Hong 1,211 Reputation points

2022-02-20T21:07:02.47+00:00

I have just tested your file by using FileOpenPicker followed by the following code immediately after picking the file:

StorageItemThumbnail sit = await file.GetThumbnailAsync(ThumbnailMode.PicturesView);

I got the same exception.

Castorix31 84,281 Reputation points

2022-02-21T07:29:57.243+00:00

Is the butterfly displayed with the C++ code ?

Hong 1,211 Reputation points

2022-02-21T14:09:05.403+00:00

No, it is in C#. I do not know how to do it with C++.
The worst scenario for me is reading the PNG file when this exception occurs, then resizing the image to thumbnail size for use.

Nico Zhu (Shanghai Wicresoft Co,.Ltd.) 12,866 Reputation points

2022-02-23T02:15:21.87+00:00

hi @Hong Above looks not answer for this question, please refer to document to convert it as comment for this thread.

Hong 1,211 Reputation points

2022-02-23T02:50:12.127+00:00

@Nico Zhu (Shanghai Wicresoft Co,.Ltd.) I have tried to convert it to comment three times but it still remains an answer.

Nico Zhu (Shanghai Wicresoft Co,.Ltd.) 12,866 Reputation points

2022-02-23T02:55:46.617+00:00

it may exceed the comment size limit, please simplify your comments next time thanks in advance.
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How to get thumbnails from PNG files?

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