Update iOS to an easier way to retrieve a stream for the image

microsoft-cognitive-services/iOS.md

@@ -46,20 +46,13 @@ void OnTakePhotoPressed (object sender, EventArgs eventArgs)
 	picker.SourceType = UIImagePickerControllerSourceType.Camera;
 
 	picker.FinishedPickingMedia += async (o, e) => {
-		// Create a moderate quality version of the image
-		byte [] dataBytes;
-		using (NSData data = e.OriginalImage.AsJPEG (.5f)) {
-			dataBytes = new byte [data.Length];
-			System.Runtime.InteropServices.Marshal.Copy (data.Bytes, dataBytes, 0, Convert.ToInt32 (data.Length));
-		}
-
 		ThePhoto.Image = e.OriginalImage;
 		DetailsText.Text = "Processing...";
 
 		((UIImagePickerController)o).DismissViewController (true, null);
 
 		// Create a stream, send it to MCS, and get back 
-		using (MemoryStream stream = new MemoryStream (dataBytes)) {
+		using (var stream = e.OriginalImage.AsJPEG(.5f).AsStream()) {
 			try {
 				float happyValue = await SharedProject.Core.GetAverageHappinessScore (stream);
 				DetailsText.Text = SharedProject.Core.GetHappinessMessage (happyValue);