创建从图像字节数组(Creating a Byte array from an Image)

什么是创建从图像的字节数组的最佳方式？ 我见过很多的方法，但在WinRT中没有一次成功。

Answer 1:

static class ByteArrayConverter
    {
        public static async Task<byte[]> ToByteArrayAsync(StorageFile file)
        {
            using (IRandomAccessStream stream = await file.OpenReadAsync())
            {
                using (DataReader reader = new DataReader(stream.GetInputStreamAt(0)))
                {
                    await reader.LoadAsync((uint)stream.Size);
                    byte[] Bytes = new byte[stream.Size];
                    reader.ReadBytes(Bytes);
                    return Bytes;
                }
            }
        }
    }

Answer 2:

这里是一个办法http://msdn.microsoft.com/en-us/library/windows/apps/windows.ui.xaml.media.imaging.writeablebitmap.aspx

或者，如果你的图片保存在FS，只需创建一个StorageFile并使用流得到的byte []

Answer 3:

神奇的是在DataReader的类 。 例如 ...

var file = await Windows.Storage.StorageFile.GetFileFromApplicationUriAsync(new Uri("ms-appx:///Assets/Logo.png"));
var buf = await FileIO.ReadBufferAsync(file);
var bytes = new byte[buf.Length];
var dr = DataReader.FromBuffer(buf);
dr.ReadBytes(bytes);

Answer 4:

我用的方法从查尔斯Petzold的 ：

        byte[] srcPixels;
        Uri uri = new Uri("http://www.skrenta.com/images/stackoverflow.jpg");
        RandomAccessStreamReference streamRef = RandomAccessStreamReference.CreateFromUri(uri);

        using (IRandomAccessStreamWithContentType fileStream = await streamRef.OpenReadAsync())
        {
            BitmapDecoder decoder = await BitmapDecoder.CreateAsync(fileStream);
            BitmapFrame frame = await decoder.GetFrameAsync(0);

            PixelDataProvider pixelProvider = await frame.GetPixelDataAsync();
            srcPixels = pixelProvider.DetachPixelData();

        }

文章来源: Creating a Byte array from an Image