WPF WriteableBitmap to byte array

Question

Is there anyway to convert a WriteableBitmap to byte array? I assign the writeablebitmap to an System.Windows.Controls.Image source too if there's a way to get it from that. I tried this but got a general GDI exception on FromHBitmap.

System.Drawing.Image img = System.Drawing.Image.FromHbitmap(wb.BackBuffer);
MemoryStream ms = new MemoryStream();
img.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
myarray = ms.ToArray();

Declared in the class scope, but I edited it to make more sense. — shady
– shady, Commented Oct 23, 2014 at 14:31

Mike Strobel · Accepted Answer · 2014-10-23 14:12:09Z

6

Your code encodes the image data in PNG format, but FromHBitmap expects raw, unencoded bitmap data.

Try this:

var width = bitmapSource.PixelWidth;
var height = bitmapSource.PixelHeight;
var stride = width * ((bitmapSource.Format.BitsPerPixel + 7) / 8);

var bitmapData = new byte[height * stride];

bitmapSource.CopyPixels(bitmapData, stride, 0);

...where bitmapSource is your WriteableBitmap (or any other BitmapSource).

answered Oct 23, 2014 at 14:12

Mike Strobel

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1 Comment

Cosmin Ioniță Over a year ago

There is no .Format.BitsPerPixel on an WriteableBitmap object in UWP. Also, CopyPixels doesn't exist. Why there are so big differences between the same data types in WPF and UWP?

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