我希望在Windows Phone 8.1上分享我的画布作为图像。为此,我先将画布转换为图像,然后分享它。我尝试了我的Windows 8.1代码,没有出现错误,但在共享源应用程序中没有图像,只有标题和描述。
以下是代码:
private async void DataTransferManager_DataRequested(DataTransferManager sender, DataRequestedEventArgs e)
{
e.Request.Data.Properties.Title = "My app";
e.Request.Data.Properties.Description = "app description";
DataRequest request = e.Request;
// Request deferral to wait for async calls
DataRequestDeferral deferral = request.GetDeferral();
// XAML objects can only be accessed on the UI thread, and the call may come in on a background thread
await Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, async () =>
{
try
{
RenderTargetBitmap renderTargetBitmap = new RenderTargetBitmap();
InMemoryRandomAccessStream stream = new InMemoryRandomAccessStream();
// Render to an image at the current system scale and retrieve pixel contents
await renderTargetBitmap.RenderAsync(SavedCanvas);
var pixelBuffer = await renderTargetBitmap.GetPixelsAsync();
// Encode image to an in-memory stream
var encoder = await BitmapEncoder.CreateAsync(BitmapEncoder.PngEncoderId, stream);
encoder.SetPixelData(
BitmapPixelFormat.Bgra8,
BitmapAlphaMode.Ignore,
(uint)renderTargetBitmap.PixelWidth,
(uint)renderTargetBitmap.PixelHeight,
DisplayInformation.GetForCurrentView().LogicalDpi,
DisplayInformation.GetForCurrentView().LogicalDpi,
pixelBuffer.ToArray());
await encoder.FlushAsync();
request.Data.Properties.Thumbnail = RandomAccessStreamReference.CreateFromStream(stream);
// e.Request.Data.Properties.Thumbnail=(RandomAccessStreamReference.CreateFromStream(stream));
// Set content of the DataProviderRequest to the encoded image in memory
request.Data.SetBitmap(RandomAccessStreamReference.CreateFromStream(stream));
}
finally
{
deferral.Complete();
}
});
}
这在 Windows 8.1 中可以正常工作,我认为在这里也应该可以。但是在分享应用程序中(如消息、OneNote 等)无法显示图像。需要帮助。谢谢。