Differences

This shows you the differences between two versions of the page.

--- notes:uwp:examples [2017/03/08]
admin [Master/details view]
+++ notes:uwp:examples [2019/04/20] (current)
leszek [Capture an image from a camera]
@@ Line 66: / Line 66: @@
-=====Capture an image from a camera=====
-Method #1:
-<code xml>
-<Page x:Class="TestApp.MainPage"
-      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
-      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
-    <StackPanel>
-        <Image x:Name="Image1" />
-        <Button Content="Capture Image" Click="CaptureImageButton_Click" />
-    </StackPanel>
-</Page>
-</code>
-<code csharp>
-using System;
-using System.Threading.Tasks;
-using Windows.Media.Capture;
-using Windows.Storage;
-using Windows.Storage.Streams;
-using Windows.UI.Xaml;
-using Windows.UI.Xaml.Controls;
-using Windows.UI.Xaml.Media.Imaging;
-namespace TestApp
-{
-    public sealed partial class MainPage : Page
-    {
-        public MainPage()
-        {
-            this.InitializeComponent();
-        }
-        private async void CaptureImageButton_Click(object sender, RoutedEventArgs e)
-        {
-            await CaptureImage();
-        }
-        private async Task CaptureImage()
-        {
-            CameraCaptureUI cameraUI = new CameraCaptureUI();
-            BitmapImage image = new BitmapImage();
-            Image1.Source = image;
-            cameraUI.PhotoSettings.AllowCropping = true;
-            cameraUI.PhotoSettings.MaxResolution = CameraCaptureUIMaxPhotoResolution.HighestAvailable;
-            cameraUI.PhotoSettings.Format = CameraCaptureUIPhotoFormat.Jpeg;
-            // Wait for a user to capture a photo.
-            StorageFile tempFile = await cameraUI.CaptureFileAsync(CameraCaptureUIMode.Photo);
-            if (tempFile != null)
-            {
-                // Transfer the captured photo to a stream.
-                IRandomAccessStreamWithContentType stream = await tempFile.OpenReadAsync();
-                // Pass the stream to a BitmapImage. The BitmapImage is the source of an Image XAML element.
-                await image.SetSourceAsync(stream);
-                // Store the photo in the local folder.
-                StorageFolder folder = ApplicationData.Current.LocalFolder;
-                var file = await tempFile.CopyAsync(folder, "picture.jpg", NameCollisionOption.ReplaceExisting);
-            }
-        }
-    }
-}
-</code>
-Method #2: This method uses //SoftwareBitmap// which you can use to perform some post-processing on the captured image:
-<code csharp>
-using System;
-using System.Threading.Tasks;
-using Windows.Foundation;
-using Windows.Graphics.Imaging;
-using Windows.Media.Capture;
-using Windows.Storage;
-using Windows.Storage.Streams;
-using Windows.UI.Xaml;
-using Windows.UI.Xaml.Controls;
-using Windows.UI.Xaml.Media.Imaging;
-namespace TestApp
-{
-    public sealed partial class MainPage : Page
-    {
-        public MainPage()
-        {
-            this.InitializeComponent();
-        }
-        private async void CaptureImageButton_Click(object sender, RoutedEventArgs e)
-        {
-            await CaptureImage();
-        }
-        private async Task CaptureImage()
-        {
-            CameraCaptureUI cameraUI = new CameraCaptureUI();
-            cameraUI.PhotoSettings.CroppedSizeInPixels = new Size(200, 200);
-            cameraUI.PhotoSettings.Format = CameraCaptureUIPhotoFormat.Jpeg;
-            // Wait for a user to capture a photo.
-            StorageFile file = await cameraUI.CaptureFileAsync(CameraCaptureUIMode.Photo);
-            if (file != null)
-            {
-                IRandomAccessStream stream = await file.OpenReadAsync();
-                // -or-
-                // using (IRandomAccessStream stream = await file.OpenAsync(FileAccessMode.Read) { ... }
-                // The Image control requires that the image source be in the BGRA8 format
-                // with pre-multiplied alpha or no alpha channel. We need to create a software
-                // bitmap with the desired format.
-                BitmapDecoder decoder = await BitmapDecoder.CreateAsync(stream); // decode the image file stream
-                SoftwareBitmap bitmap = await decoder.GetSoftwareBitmapAsync();
-                SoftwareBitmap bitmapBGR8 = SoftwareBitmap.Convert(bitmap,
-                    BitmapPixelFormat.Bgra8,
-                    BitmapAlphaMode.Premultiplied);
-                SoftwareBitmapSource source = new SoftwareBitmapSource();
-                await source.SetBitmapAsync(bitmapBGR8);
-                Image1.Source = source;
-            }
-        }
-    }
-}
-</code>
-**Win10 update**: In UWP apps, you can use the //SoftwareBitmapSource// type as a XAML image source. This lets you pass un-encoded images to the XAML framework to be immediately displayed on screen, bypassing image decoding by the XAML framework.
-More information can be found [[https://docs.microsoft.com/en-us/windows/uwp/audio-video-camera/capture-photos-and-video-with-cameracaptureui|here]].

Wisenheimer Brainstorm Wiki

User Tools

Site Tools

Differences

Page Tools