Convert 'Xamarin.Form.Image' type 'byte[]'

Question

I am supposed to get an Image from a url and convert it into byte[]. The following is what I achieved

var webImage = new Image { Aspect = Aspect.AspectFit };
webImage.Source = ImageSource.FromUri(new    Uri("http://xamarin.com/content/images/pages/forms/example-app.png"));

but now I am unable to convert the Image type to byte[].

Is this the correct way to approach? Any kind of help would be appreciated.

possible duplicate of [Converting UIImage to Byte Array](http://stackoverflow.com/questions/17112314/converting-uiimage-to-byte-array) — Krumelur, Mar 18 '15 at 13:32
Its not a duplicate, the question you pointed out as duplicate is iOS only — Rohit Vipin Mathews, Mar 18 '15 at 13:34
@Rohit Correct, but you will have to do it on a per platform basis. — Krumelur, Mar 19 '15 at 19:15
So then a good way should be creating an interface in the forms project and implementing it in each platform. — Rohit Vipin Mathews, Mar 19 '15 at 19:20

score 0 · Answer 1 · answered Mar 18 '15 at 13:30

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I haven't tried this but from my initial thought you will need a Stream. For that you could use StreamImageSource

From there you can use the code from this.

answered Mar 18 '15 at 13:30

Rohit Vipin Mathews

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public static byte[] ReadStreamIntoByte (Stream input) { using (MemoryStream ms = new MemoryStream()) { input.CopyTo(ms); return ms.ToArray(); } } does not work with StreamImageSource as input parameter. – Aug 08 '16 at 14:16

score 0 · Answer 2 · answered Mar 20 '15 at 11:38

Xamarin.Forms inside it uses IImageSourceHandler which has realizations like

ImageLoaderSourceHandler - for UriImageSource
StreamImagesourceHandler - for StreamImageSource
and so on

For reading data from UriImageSource You should use ImageLoaderSourceHandler which is platform class. So under each platform use code like

var handler = new ImageLoaderSourceHandler();
var uiimage = await handler.LoadImageAsync(source, new CancellationToken(), UIScreen.MainScreenScale);

Then you can reach any data from UIImage under iOS or from Bitmap under Android. There are a lot of tutorials how to get byte[] from them.

score 0 · Answer 3 · answered Dec 16 '15 at 02:01

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FFImageLoading (https://github.com/molinch/FFImageLoading/) CachedImage has GetImageAsJPG and GetImageAsPNG methods. It's a direct Xamarin.Forms Image class replacement with a lot of additional features.

Here's the code used for image retrieving (it can be used in a Image class custom renderers):

answered Dec 16 '15 at 02:01

Daniel Luberda

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Is your provided solution a solution to the question? I also wonder if it is still in development, because I cant build the solution. "FFImageLoading.Transformations.Windows" is not compatible with uap10.0" or "wpa81" and so on. – Aug 09 '16 at 10:17

score 0 · Answer 4 · answered Jan 17 '16 at 23:27

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It's posible to use WebClient to obtain byte array from a URL.

var webClient = new WebClient ();
byte[] byteImage = webClient.DownloadData (imageURL);

answered Jan 17 '16 at 23:27

Jovel Barrera

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Convert 'Xamarin.Form.Image' type 'byte[]'

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