Error when convert byte array to BitmapImage in UWP

Question

I want to get a BitmapImage when capture view's screenshot. So I start to get byte array data first, then convert to BitmapImage.

RenderTargetBitmap renderTarget = new RenderTargetBitmap();
await renderTarget.RenderAsync(swapChainPanel);    
IBuffer pixelBuffer = await renderTarget.GetPixelsAsync();

await GetBitmapAsync(pixelBuffer.ToArray());
...
public static async Task<BitmapImage> GetBitmapAsync(byte[] data)
        {
            var bitmapImage = new BitmapImage();

            try
            {
                using (var stream = new InMemoryRandomAccessStream())
                {
                    using (var writer = new DataWriter(stream))
                    {
                        writer.WriteBytes(data);
                        await writer.StoreAsync();
                        await writer.FlushAsync();
                        writer.DetachStream();
                    }

                    stream.Seek(0);
                    await bitmapImage.SetSourceAsync(stream); // throw Exception
                }

                return bitmapImage;
            }
            catch (Exception e)
            {
                return null;
            }
        }

But it give error :

The component cannot be found. (Exception from HRESULT: 0x88982F50)

Please help me to find the problem.

@NicoZhu-MSFT That's await bitmapImage.SetSourceAsync(stream); — quangkid
– quangkid, Commented Dec 15, 2020 at 9:48

Nico Zhu · Accepted Answer · 2020-12-15 12:29:35Z

1

Error when convert byte array to BitmapImage in UWP

The problem is you have not specific BitmapEncoder for BitmapImage when convertering. In general, we often use the following code to get BitmapImage from bytes.

_backAction = new Action<byte[]>(async (bytes) =>
{
    InMemoryRandomAccessStream stream = new InMemoryRandomAccessStream();     
    BitmapImage img = new BitmapImage();
    var encoder = await BitmapEncoder.CreateAsync(BitmapEncoder.PngEncoderId, stream);
    encoder.SetPixelData(
        BitmapPixelFormat.Bgra8,
        BitmapAlphaMode.Straight,
        (uint)48,
        (uint)32,
        DisplayInformation.GetForCurrentView().LogicalDpi,
        DisplayInformation.GetForCurrentView().LogicalDpi,
        bytes);
    await encoder.FlushAsync();
    await img.SetSourceAsync(stream);
});

edited Dec 15, 2020 at 12:29

answered Dec 15, 2020 at 12:04

Nico Zhu

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