问使用中兴库解码条形码可以在1台平板上工作，但不能在另一台平板上工作。

EN

string barcodeData = string.Empty;
            using (var imageStream = new InMemoryRandomAccessStream())
            {
                processingImage = true;
                var encodingProperties = new ImageEncodingProperties();
                encodingProperties.Subtype = "Jpeg";
                encodingProperties.Width = 400;
                encodingProperties.Height = 400;

                await captureMgr.CapturePhotoToStreamAsync(encodingProperties, imageStream);
                await imageStream.FlushAsync();
                imageStream.Seek(0);

                var bitmap = new WriteableBitmap(400, 400);
                bitmap.SetSource(imageStream);
                preview1.Source = bitmap; //preview1 is an Image control to display the captured image

                BitmapImage bitmapImage = new BitmapImage();
                bitmapImage.SetSource(imageStream);

                imageStream.Seek(0);

                var bitmapDecoder = await BitmapDecoder.CreateAsync(BitmapDecoder.JpegDecoderId, imageStream);

                var data = await bitmapDecoder.GetPixelDataAsync(
                    BitmapPixelFormat.Bgra8,
                    BitmapAlphaMode.Straight,
                    new BitmapTransform(),
                    ExifOrientationMode.IgnoreExifOrientation,
                    ColorManagementMode.DoNotColorManage
                    );
                if (data != null)
                {
                    BarcodeReader barcodeReader = new BarcodeReader();

                    var result = barcodeReader.Decode(
                        data.DetachPixelData(),
                        (int)bitmapDecoder.PixelWidth,
                        (int)bitmapDecoder.PixelHeight,
                        ZXing.RGBLuminanceSource.BitmapFormat.BGR32
                        );
                    if (result != null)
                    {
                        //Barcode found
                    }
                    else
                       //No data found.
                }
            }