im developing an Live Tile APP to show the current Network State on the Live Tile.
I already have a working XamlRenderingBackgroundTask, i can load Custom Tile Templates from XML files and i Render it with a RenderTargetBitmap to a PNG file.
But if i start the APP and Register the Background Task, i have to wait until the BackgroundTask starts to see an updated Live Tile.
As far as i know it is not possible to use this code from the Main APP. RendertargetBitmap needs an Element from the XAML Tree or a XamlRenderingBackgroundTask.
So, how can i update the Live Tile direclty after registering the Task?
var small_folder = await Windows.ApplicationModel.Package.Current.InstalledLocation.GetFolderAsync("Assets");
var small_file = await small_folder.GetFileAsync("WWAN_Tile_small.xml");
string small_szCustomTileXML = await Windows.Storage.FileIO.ReadTextAsync(small_file);
Border small_tile = XamlReader.Load(small_szCustomTileXML) as Border;
if (null != small_tile)
{
Grid grid = small_tile.Child as Grid;
Image logo = grid.FindName("img_Center") as Image;
var logo_img = new BitmapImage() { CreateOptions = BitmapCreateOptions.None };
logo_img.UriSource = new Uri("ms-appx:///Assets/Signal/WWAN/big/3.png");
logo.Source = logo_img;
RenderTargetBitmap rtb = new RenderTargetBitmap();
await rtb.RenderAsync(small_tile, 71, 71);
IBuffer pixels = await rtb.GetPixelsAsync();
DataReader dReader = Windows.Storage.Streams.DataReader.FromBuffer(pixels);
byte[] data = new byte[pixels.Length];
dReader.ReadBytes(data);
var outputFile = await Windows.Storage.ApplicationData.Current.LocalFolder.CreateFileAsync("Square71x71Logo.scale-100.png", Windows.Storage.CreationCollisionOption.ReplaceExisting);
var outputStream = await outputFile.OpenAsync(Windows.Storage.FileAccessMode.ReadWrite);
BitmapEncoder enc = await BitmapEncoder.CreateAsync(BitmapEncoder.PngEncoderId, outputStream);
enc.SetPixelData(BitmapPixelFormat.Bgra8, BitmapAlphaMode.Premultiplied, (uint)rtb.PixelWidth, (uint)rtb.PixelHeight, 96, 96, data);
await enc.FlushAsync();
}
