How to convert BitmapImage's source to a byteArray

Question

I'm working on a Windows Store App that uses SQLite3 to save database. I finished building and testing my Database and its working fine. Everything is working well but I'm currently stuck in saving BitmapImage that I obtained from Image->Source.

I understand that to initialize the BitmapImage I need to do BitmapImage->SetSource(Stream), But I cannot find a getSource method in Documentation of Bitmap Image. If such thing exist I would've expected it to return a Stream that I could've easily converted to a byte Array but since that is not the case, I'm currently on halt with my project. Any help would be appreciated.

Answer 1

Use a WriteableBitmap instead of a BitmapImage if you need access to the pixels.

Answer 2

Hi

You can use WriteableBitmap

    

WriteableBitmap writeableBitmap = new WriteableBitmap(bitmapImage);
            Stream stream = writeableBitmap.PixelBuffer.AsStream();

            byte[] pixels = new byte[stream.Length];

            await stream.ReadAsync(pixels, 0, pixels.Length);

Regards

---

Varun Ravindranath

Answer 3

Varun, this is a C++ forum. The Visual C++ compiler won't understand your example :-)

Answer 4

Hi Varun,

Your sample code appears to be for WPF. It is not valid for Windows Store apps (even if, as Michael notes, it were converted to C++).

There is no good way to recover the pixels from a BitmapImage. Instead the app will need to either reacquire from the original source or render into a RenderTargetBitmap. If you know you will need access to the pixels then you can load it into a WriteableBitmap instead of a BitmapImage.

--Rob