LowLagPhotoCapture.FinishAsync Metode

Definisi

Ruang nama:

Windows.Media.Capture

Secara asinkron merilis objek dan sumber daya LowLagPhotoCapture yang digunakan oleh operasi pengambilan foto.

public:
 virtual IAsyncAction ^ FinishAsync() = FinishAsync;

/// [Windows.Foundation.Metadata.RemoteAsync]
IAsyncAction FinishAsync();

[Windows.Foundation.Metadata.RemoteAsync]
public IAsyncAction FinishAsync();

function finishAsync()

Public Function FinishAsync () As IAsyncAction

Mengembalikan

IAsyncAction

Objek yang digunakan untuk mengontrol operasi asinkron.

Atribut

RemoteAsyncAttribute

Contoh

Berikut adalah contoh yang menunjukkan cara mengatur dan mengambil foto jeda rendah. Ini menampilkan foto dan gambar mini yang diambil dalam objek Gambar . XAML membuat UI sederhana dengan dua objek Gambar dan beberapa objek Tombol untuk berinteraksi dengan elemen MediaCapture . Dalam kode, ada metode untuk menginisialisasi objek MediaCapture , metode untuk menginisialisasi objek LowLagPhotoCapture , metode untuk mengambil foto dan menampilkannya, dan metode untuk mematikan LowLagPhotoCapture.

<StackPanel Orientation="Horizontal">
    <Image x:Name="imageLowLagPhoto" Stretch="None" 
           Width="320" Height="240" />
    <Image x:Name="imageLowLagThumbnail" Stretch="None" 
           Width="320" Height="240" />
</StackPanel>

<StackPanel Orientation="Horizontal">
    <Button Click="InitMediaCapture_Click" Content="Initialize Camera" />
    <Button Click="InitLowLagPhotoCapture_Click" Content="Initialize Low Lag Photo Capture"/>
    <Button Click="CaptureLagPhotoCapture_Click" Content="Capture Low Lag Photo"/>
    <Button Click="CloseLagPhotoCapture_Click" Content="Finish low Lag Capture"/>
</StackPanel>

LowLagPhotoCapture lowLagCaptureMgr = null;
MediaCapture mediaCaptureManager;

async private void InitMediaCapture_Click(object sender, RoutedEventArgs e)
{
    mediaCaptureManager = new MediaCapture();
    await mediaCaptureManager.InitializeAsync();
}

async private void InitLowLagPhotoCapture_Click(object sender, RoutedEventArgs e)
{
    // Enable thumbnail images
    mediaCaptureManager.VideoDeviceController.LowLagPhoto.ThumbnailEnabled = true;
    mediaCaptureManager.VideoDeviceController.LowLagPhoto.ThumbnailFormat = MediaThumbnailFormat.Bmp;
    mediaCaptureManager.VideoDeviceController.LowLagPhoto.DesiredThumbnailSize = 25;

    // Image properties
    ImageEncodingProperties imgFormat = ImageEncodingProperties.CreateJpeg();

    // Create LowLagPhotoCapture object
    lowLagCaptureMgr = await mediaCaptureManager.PrepareLowLagPhotoCaptureAsync(imgFormat);
}

async private void CaptureLagPhotoCapture_Click(object sender, RoutedEventArgs e)
{
    // Take photo
    CapturedPhoto photo = await lowLagCaptureMgr.CaptureAsync();

    // Get photo as a BitmapImage
    BitmapImage bitmap = new BitmapImage();
    await bitmap.SetSourceAsync(photo.Frame);

    // Get thumbnail as a BitmapImage
    BitmapImage bitmapThumbnail = new BitmapImage();    
    await bitmapThumbnail.SetSourceAsync(photo.Thumbnail);

    // imageLowLagPhoto is a <Image> object defined in XAML
    imageLowLagPhoto.Source = bitmap;

    // imageLowLagThumbnail is a <Image> object defined in XAML
    imageLowLagThumbnail.Source = bitmapThumbnail;
}

async private void CloseLagPhotoCapture_Click(object sender, RoutedEventArgs e)
{
    // Release the LowLagPhotoCapture object and resources
    await lowLagCaptureMgr.FinishAsync();
}