将 BitmapImage 转换为 byte[]

Question

我在将 BitmapImage 转换为 byte[] 时遇到问题。每次我遇到不同的错误时，我尝试了很多解决方案，但没有任何效果。

例如，我找到了很好的解决方案，但它也不起作用。怎么了？

我正在使用 Windows Phone 8.1.

public static byte[] ImageToBytes(BitmapImage img)
{
    using (MemoryStream ms = new MemoryStream())
    {
        WriteableBitmap btmMap = new WriteableBitmap(img);
        System.Windows.Media.Imaging.Extensions.SaveJpeg(btmMap, ms, img.PixelWidth, img.PixelHeight, 0, 100);
        img = null;
        return ms.ToArray();
    }
}

这是从这里截取的：Convert Bitmap Image to byte array (Windows phone 8)

There is no argument given that corresponds to the required formal parameter 'pixelHeight' of 'WriteableBitmap.WriteableBitmap(int, int)'

The type or namespace name 'Extensions' does not exist in the namespace 'System.Windows.Media.Imaging' (are you missing an assembly reference?)

或者如果有人对如何转换它有其他想法，请post。非常感谢您的帮助！

我也试过这个：BitmapImage to byte[]

但是使用有问题

'BitmapImage' is an ambiguous reference between 'System.Windows.Media.Imaging.BitmapImage' and 'Windows.UI.Xaml.Media.Imaging.BitmapImage'

所以我使用了"BitmapEncoder"，但它没有像保存和帧这样的方法。

Answer 1

看下面link可能会有帮助

https://social.msdn.microsoft.com/Forums/en-US/713c0ed1-d979-43ef-8857-bbe0b35576a9/windows-8-how-to-convert-bitmapimage-into-byte?forum=winappswithcsharp

Answer 2

你试过了吗

      MemoryStream ms = new MemoryStream();
      WriteableBitmap wb = new WriteableBitmap(myImage);
      wb.SaveJpeg(ms, myImage.PixelWidth, myImage.PixelHeight, 0, 100);
      byte[] imageBytes = ms.ToArray();

这里也可以使用扩展方法

      public static class MyExtensions
      {
          public static Byte[] ByteFromImage(this System.Windows.Media.Imaging.BitmapImage imageSource)
          {
            Stream stream = imageSource.StreamSource;
            Byte[] imagebyte = null;
            if (stream != null && stream.Length > 0)
            {
               using (BinaryReader br = new BinaryReader(stream))
               {
                 imagebyte = br.ReadBytes((Int32)stream.Length);
               }
            }

              return imagebyte;
          }
       }

然后调用

        System.Windows.Media.Imaging.BitmapImage myImage = new System.Windows.Media.Imaging.BitmapImage();
        byte[] imageBytes = myImage.ByteFromImage();

Answer 3

我认为在这个平台上做不到。我将我的项目更改为 Windows Phone Silverlight/8.0 一切正常。

 public static BitmapImage BytesToImage(byte[] bytes)
    {
        BitmapImage bitmapImage = new BitmapImage();
        try
        {
            using (MemoryStream ms = new MemoryStream(bytes))
            {
                bitmapImage.SetSource(ms);
                return bitmapImage;
            }
        }
        finally { bitmapImage = null; }
    }

    public static byte[] ImageToBytes(BitmapImage img)
    {
        using (MemoryStream ms = new MemoryStream())
        {
            WriteableBitmap btmMap = new WriteableBitmap(img);
            System.Windows.Media.Imaging.Extensions.SaveJpeg(btmMap, ms, img.PixelWidth, img.PixelHeight, 0, 100);
            img = null;
            return ms.ToArray();
        }
    }

Answer 4

如果您要对图像进行任何转换，您需要使用适当的图像编码器，然后执行如下操作。如果您使用的是多帧图像（例如 TIF），则需要一次将一个帧添加到编码器，否则您只会获得图像的第一帧。

MemoryStream ms = null;
TiffBitmapEncoder enc = null

enc = new TiffBitmapEncoder();
enc.Compression = TiffCompressOption.Ccitt4;
enc.Frames.Add(BitmapFrame.Create(bmpImg));
using (ms = new MemoryStream())
{
  enc.Save(ms);
}
return ms.ToArray();

将 BitmapImage 转换为 byte[]

Convert BitmapImage to byte[]

c#

bytearray

windows-phone-8.1