empty byte array c# winrt

Question

I have WriteableBitmap. I know that in variable wp1 exists image, because I saved this picture, and it was all fine. I need to encode the image into a byte[] array.

WriteableBitmap wp1 = new WriteableBitmap(1, 1); ;
wp1.SetSourceAsync(memStream);

using (Stream stream = wp1.PixelBuffer.AsStream())
{
    if (stream.CanWrite)
    {
        byte[] pixelArray = new byte[stream.Length];
        await stream.ReadAsync(pixelArray, 0, pixelArray.Length);
    }
}

After all the pixelArray is empty. Length of the array pixelArray equals to the length of stream, but all bytes are zero. What should I do?

Why are you checking for the ability to write to the stream before reading from it? It's not really clear what you're trying to do here. I strongly suspect that SetSourceAsync isn't what you want - and I notice you're not awaiting it, either. — Jon Skeet
– Jon Skeet, Commented Apr 7, 2013 at 8:47

K Mehta · Accepted Answer · 2013-04-07 08:48:45Z

2

I think your problem is this line of code:

wp1.SetSourceAsync(memStream);

That's an asynchronous method, so you'll have to wait until it's done before proceeding. Try changing it to:

await wp1.SetSourceAsync(memStream);

answered Apr 7, 2013 at 8:48

K Mehta

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VasileF · Accepted Answer · 2013-04-07 13:20:58Z

0

If you're using WriteableBitmap Extensions, there's an easier method that does that for you, something like :var pixelDataArray = wp1.ToByteArray();

answered Apr 7, 2013 at 13:20

VasileF

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