CODEWITHSUNDEEP
c#windows-phone-7
Tim Windsor
Tim Windsor

Reputation: 329

BitmapSource into a stream Windows Phone

I have a class which requires a Stream to rotate an image from the phone camera. The problem I have is that when loading the picture from isolated storage (ie after the user has saved the picture previously) it is loaded into a BitmapSource.

I would like to 'extract' the bitmap source back into a stream if possible? does anyone know if it is using silverlight for WP7?

Thanks

Upvotes: 3

Views: 6149

Answers (3)

zbw911
zbw911

Reputation: 98

        var background = Brushes.Transparent;

        var bmp = Viewport3DHelper.RenderBitmap(viewport, 500, 500, background);

        BitmapEncoder encoder;
        string ext = Path.GetExtension(FileName);
        switch (ext.ToLower())
        {

            case ".png":
                var png = new PngBitmapEncoder();
                png.Frames.Add(BitmapFrame.Create(bmp));
                encoder = png;
                break;
            default:
                throw new InvalidOperationException("Not supported file format.");
        }

        //using (Stream stm = File.Create(FileName))
        //{
        //    encoder.Save(stm);
        //}

        using (MemoryStream stream = new MemoryStream())
        {
            encoder.Save(stream);

            this.pictureBox1.Image = System.Drawing.Image.FromStream(stream);
        }

Upvotes: 1

Amulya Khare
Amulya Khare

Reputation: 7698

Give this a try:

WriteableBitmap bmp = new WriteableBitmap((BitmapSource)img);

using (MemoryStream stream = new MemoryStream()) {

    bmp.SaveJpeg(stream, bmp.PixelWidth, bmp.PixelHeight, 0, 100);
    return stream;
}

Upvotes: 5

Chris Koenig
Chris Koenig

Reputation: 2748

You don't have to pull it back into a BitMap source directly, but you can get there through the IsolatedStorageFileStream class.

Here's my version of your class whose method accepts a stream (your code obviously does more than mine, but this should be enough for our purposes).

public class MyPhotoClass
{
    public BitmapSource ConvertToBitmapSource(Stream stream)
    {
        BitmapImage img = new BitmapImage();
        img.SetSource(stream);
        return img;
    }
}

Then calling that class with data from the file we pulled from Isolated Storage:

private void LoadFromIsostore_Click(object sender, RoutedEventArgs e)
{
    using (IsolatedStorageFile file = IsolatedStorageFile.GetUserStoreForApplication())
    {
        using (IsolatedStorageFileStream fs = file.OpenFile("saved.image", FileMode.Open))
        {
            MyPhotoClass c = new MyPhotoClass();
            BitmapSource picture = c.ConvertToBitmapSource(fs);
            MyPicture.Source = picture;
        }
    }
}

Note that we're using the IsolatedStorageFileStream object returned from the OpenFile method directly. It's a stream, which is what ConvertToBitmapSource expects.

Let me know if that's not what you're looking for or if I misunderstood your question...

Upvotes: 2

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