I am trying to update the band Me Tile image from a background task and i get the following error at WriteableBitmap:
System.Exception: The application called an interface that was marshalled for a different thread. (Exception from HRESULT: 0x8001010E (RPC_E_WRONG_THREAD))
at Windows.UI.Xaml.Media.Imaging.WriteableBitmap..ctor(Int32 pixelWidth, Int32 pixelHeight)
at BackgroundTaskCS.UpdateBandTask.<LoadImage>d__f.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
It looks like the WriteableBitmap needs to run on the UI Thread but I don't think I have access to UI thread since I need to update the tile without the app being open. Is there an alternative solution to this?
Below is the task I am using. Thanks in advance.
I started this question here and was directed to stackoverflow because of the band.
public async void Run(IBackgroundTaskInstance taskInstance)
{
BackgroundTaskDeferral _deferral = taskInstance.GetDeferral();
await UpdateMeTile();
Debug.WriteLine("CS Task Run");
_deferral.Complete();
}
private static async Task UpdateMeTile()
{
/// <summary>
/// Connect to Microsoft Band and change the wallpaper.
/// </summary>
try
{
// Get the list of Microsoft Bands paired to the phone.
IBandInfo[] pairedBands = await BandClientManager.Instance.GetBandsAsync();
if (pairedBands.Length < 1)
{
return;
}
// Connect to Microsoft Band.
using (IBandClient bandClient = await BandClientManager.Instance.ConnectAsync(pairedBands[0]))
{
// Change the wallpaper.
await bandClient.PersonalizationManager.SetMeTileImageAsync(await LoadImage("ms-appx:///Assets/SampleMeTileImage.jpg"));
}
}
catch (Exception ex)
{
//this.textBlock.Text = ex.ToString();
Debug.WriteLine("!!!!!!!!!!!!!!!!!!Exception. {0}", ex);
}
}
private static async Task<BandImage> LoadImage(string uri)
{
StorageFile imageFile = await StorageFile.GetFileFromApplicationUriAsync(new Uri(uri));
using (IRandomAccessStream fileStream = await imageFile.OpenAsync(FileAccessMode.Read))
{
WriteableBitmap bitmap = new WriteableBitmap(1, 1);
await bitmap.SetSourceAsync(fileStream);
bitmap.ToBandImage();
return bitmap.ToBandImage();
}
}