将图像数据转换为流

Question

我正在尝试将图像数据转换为流以获取ExifInfo/元数据

 MediaLibrary library = new MediaLibrary();
 Picture photoFromLibrary = library.GetPictureFromToken(queryStrings["FileId"]);

photoFromLibrary.GetImage();仅返回ImageData

我需要它在我的方法中使用

public static void GetMetaData(Stream photo)
{
    ExifLib.JpegInfo info = ExifLib.ExifReader.ReadJpeg(photo);
    var img = new BitmapImage();
    img.SetSource(photo);
    App.MainViewModel.MetaDate = ReadExif(info);
}

ExifLib.ExifReader.ReadJpeg(photo);需要流

所以我从photoFromLibrary.GetImage();那里得到的是ImageData，但我需要一个stream。那么如何将ImageData转换为stream呢？

Answer 1

       I hope your are looking for this result.            

        var wb = new WriteableBitmap(ContentPanel, new TranslateTransform());
        using (var mediaLibrary = new MediaLibrary())
        {
            using (var stream = new MemoryStream())
            {
                var fileName = string.Format("{0}.jpg", DateTime.Now.ToString("yyyy-MM-dd-hh-mm-ss"));
                wb.SaveJpeg(stream, wb.PixelWidth, wb.PixelHeight, 0, quality);
                stream.Seek(0, SeekOrigin.Begin);
                var picture = mediaLibrary.SavePicture(fileName, stream);
            }
        }

Answer 2

您是否尝试使用WriteableBitmap将Image转换为stream？

位图源到流 Windows Phone