转换的ImageSource在Metro Windows中WriteableBitmap的8

问题描述

我想知道如何将一个 ImageSource 对象（在我的情况下，图像元素的源属性）转换为 WriteableBitmap 。 WriteableBitmap（BitmapSource）构造函数在Windows 8 Metro中不起作用，因此我不能这样做。

我试图将 ImageSource 对象加载到流中，然后使用 WriteableBitmap .SetSource（stream），但我不知道如何加载流中的图像。

  InMemoryRandomAccessStream ras = new InMemoryRandomAccessStream 
 BitmapEncoder enc = await BitmapEncoder.CreateAsync（BitmapEncoder.PngEncoderId，ras）; 
 
 byte [] pixelArray = new byte [（uint）photoBox.Height *（uint）photoBox.Width * 4]; 
 
 enc.SetPixelData（BitmapPixelFormat.Rgba8，BitmapAlphaMode.Straight，
（uint）photoBox.Width，（uint）photoBox.Height，96，96，pixelArray）; 
  

我还添加了我在网上找到的帮助方法：

  public Byte [] BufferFromImage（BitmapImage imageSource）
 {
 Stream stream = imageSource.StreamSource; 
 Byte [] buffer = null; 
 if（stream！= null&& stream.Length> 0）
 {
 using（BinaryReader br = new BinaryReader（stream））
 {
 buffer = br.ReadBytes（（Int32）stream.Length）; 
} 
} 
 
返回缓冲区; 
} 
  

问题是 BitmapImage 不再具有 StreamSource 方法。

解决方案

我在MSDN论坛上得到了答案。

I was wondering how I could go about converting an ImageSource object (in my case the source property of an image element) to a WriteableBitmap. The WriteableBitmap(BitmapSource) constructor doesn't work in Windows 8 Metro, so I can't do that.

I've tried to load the ImageSource object into a stream and then use WriteableBitmap.SetSource(stream), but I can't figure out how do load the image in a stream either.

InMemoryRandomAccessStream ras = new InMemoryRandomAccessStream();
BitmapEncoder enc = await BitmapEncoder.CreateAsync(BitmapEncoder.PngEncoderId, ras);

byte[] pixelArray = new byte[(uint)photoBox.Height * (uint)photoBox.Width * 4];

enc.SetPixelData(BitmapPixelFormat.Rgba8, BitmapAlphaMode.Straight,
                 (uint)photoBox.Width, (uint)photoBox.Height, 96, 96, pixelArray);

I've also added this helper method I found online:

public Byte[] BufferFromImage(BitmapImage imageSource)
{
    Stream stream = imageSource.StreamSource;
    Byte[] buffer = null;
    if (stream != null && stream.Length > 0)
    {
        using (BinaryReader br = new BinaryReader(stream))
        {
            buffer = br.ReadBytes((Int32)stream.Length);
        }
    }

    return buffer;
}

The problem is that BitmapImage no longer has the StreamSource method.

解决方案

I got an answer on the MSDN forums.

Source

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