我通过URI(网络或文件系统)获取到一张图片,想要将其编码为PNG格式并保存到临时文件:
var bin = new MemoryStream(raw).AsRandomAccessStream(); //raw is byte[]
var dec = await BitmapDecoder.CreateAsync(bin);
var pix = (await dec.GetPixelDataAsync()).DetachPixelData();
var res = new FileStream(Path.Combine(ApplicationData.Current.LocalFolder.Path, "tmp.png"), FileMode.Create);
var enc = await BitmapEncoder.CreateAsync(BitmapEncoder.PngEncoderId, res.AsRandomAccessStream());
enc.SetPixelData(BitmapPixelFormat.Bgra8, BitmapAlphaMode.Ignore, dec.PixelWidth, dec.PixelHeight, 96, 96, pix);
await enc.FlushAsync(); //hangs here
res.Dispose();
问题是,这段代码在
await enc.FlushAsync()
行上挂起了。请帮忙!谢谢。