从照片捕获设备捕获照片

我正在创建一个图像编辑应用程序。 我想为用户提供一个选项，即他也可以在运行时捕获图像并对捕获的图像应用编辑效果。 目前，我正在按照Windows Phone 8的高级照片捕获的说明进行操作。

有2个问题首先，我面临的是，当我点击捕获按钮时，捕获的图像将是反转图像。如果我将手机置于横向模式，那么它会拍摄正确的照片。

当应用程序启动时，屏幕上没有任何内容，换句话说，它完全是黑色的。我希望屏幕显示相机视图，以便用户知道他将要捕获的内容。

下面是我的 Mainpage.xaml.cs 文件和 MainPage.xaml 文件的代码。

namespace CapturingPhoto {
public partial class MainPage : PhoneApplicationPage {
    private MemoryStream imageStream;
    private PhotoCaptureDevice captureDevice;
    private CameraCaptureSequence seq;
   // Constructor
    public MainPage() {
        InitializeComponent();
        imageStream = new MemoryStream();
        // Sample code to localize the ApplicationBar
        //BuildLocalizedApplicationBar();
        prepareResouceToCapture();
    }
    private async void prepareResouceToCapture() { 
        if((!PhotoCaptureDevice.AvailableSensorLocations.Contains(CameraSensorLocation.Back)) &&
            (!PhotoCaptureDevice.AvailableSensorLocations.Contains(CameraSensorLocation.Front))){
                return;
        }
       Windows.Foundation.Size size;
        if(PhotoCaptureDevice.AvailableSensorLocations.Contains(CameraSensorLocation.Back)){
            IReadOnlyList <Windows.Foundation.Size> avalaibleSizeList =  
                PhotoCaptureDevice.GetAvailableCaptureResolutions(CameraSensorLocation.Back);
            size = avalaibleSizeList[0];
            this.captureDevice = await PhotoCaptureDevice.OpenAsync(CameraSensorLocation.Back, size);
        }
        else{
            IReadOnlyList<Windows.Foundation.Size> avalaibleSizeList =
                PhotoCaptureDevice.GetAvailableCaptureResolutions(CameraSensorLocation.Front);
            size = avalaibleSizeList[0];
            this.captureDevice = await PhotoCaptureDevice.OpenAsync(CameraSensorLocation.Front, size);
        }

     //  await this.captureDevice.SetCaptureResolutionAsync(size);
      // await this.captureDevice.SetPreviewResolutionAsync(size);
     //  BackgroundVideoBrush.SetSource(this.captureDevice);


    }

    private async void onCaptureImage(object sender, RoutedEventArgs e) {
        seq = captureDevice.CreateCaptureSequence(1);
        captureDevice.SetProperty(KnownCameraPhotoProperties.FlashMode, FlashState.On);
        captureDevice.SetProperty(KnownCameraGeneralProperties.PlayShutterSoundOnCapture, false);
        captureDevice.SetProperty(KnownCameraGeneralProperties.AutoFocusRange, AutoFocusRange.Normal);
        seq.Frames[0].CaptureStream = imageStream.AsOutputStream();
        await captureDevice.PrepareCaptureSequenceAsync(seq);
        CaptureImage();

    }

    public async void CaptureImage() {
        await seq.StartCaptureAsync();
        // Set the stream position to the beginning.
        imageStream.Seek(0, SeekOrigin.Begin);
        MediaLibrary library = new MediaLibrary();
        Picture picture1 = library.SavePictureToCameraRoll("image1", imageStream);
    }

}

}

Xaml 文件的代码

<phone:PhoneApplicationPage
x:Class="CapturingPhoto.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone"
xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
FontFamily="{StaticResource PhoneFontFamilyNormal}"
FontSize="{StaticResource PhoneFontSizeNormal}"
Foreground="{StaticResource PhoneForegroundBrush}"
SupportedOrientations="Portrait" Orientation="Portrait"
shell:SystemTray.IsVisible="True">
<!--LayoutRoot is the root grid where all page content is placed-->
<Grid x:Name="LayoutRoot" Background="Transparent" Height="768" VerticalAlignment="Bottom">
    <Grid.RowDefinitions>
        <RowDefinition Height="Auto"/>
        <RowDefinition Height="*"/>
    </Grid.RowDefinitions>
    <!-- LOCALIZATION NOTE:
        To localize the displayed strings copy their values to appropriately named
        keys in the app's neutral language resource file (AppResources.resx) then
        replace the hard-coded text value between the attributes' quotation marks
        with the binding clause whose path points to that string name.
        For example:
            Text="{Binding Path=LocalizedResources.ApplicationTitle, Source={StaticResource LocalizedStrings}}"
        This binding points to the template's string resource named "ApplicationTitle".
        Adding supported languages in the Project Properties tab will create a
        new resx file per language that can carry the translated values of your
        UI strings. The binding in these examples will cause the value of the
        attributes to be drawn from the .resx file that matches the
        CurrentUICulture of the app at run time.
     -->

    <!--ContentPanel - place additional content here-->
    <Canvas x:Name="VideoCanvas" RenderTransformOrigin="0.5,0.5" Canvas.ZIndex="0">
        <Canvas.RenderTransform>
            <CompositeTransform/>
        </Canvas.RenderTransform>
        <Canvas.Background>
            <!-- The background contains the camera view finder
                 encapsulated in VideoBrush. -->
            <VideoBrush x:Name="BackgroundVideoBrush" >
                <VideoBrush.RelativeTransform>
                    <CompositeTransform x:Name="VideoBrushTransform" CenterY="0.5" CenterX="0.5"/>
                </VideoBrush.RelativeTransform>
            </VideoBrush>
        </Canvas.Background>
    </Canvas>
    <Button x:Name="btn_Edit" Content="Capture" HorizontalAlignment="Left" 
                Margin="23,691,0,0" VerticalAlignment="Top" 
                Width="400" Click="onCaptureImage"/>

    <!--Uncomment to see an alignment grid to help ensure your controls are
        aligned on common boundaries.  The image has a top margin of -32px to
        account for the System Tray. Set this to 0 (or remove the margin altogether)
        if the System Tray is hidden.
        Before shipping remove this XAML and the image itself.-->
    <!--<Image Source="/Assets/AlignmentGrid.png" VerticalAlignment="Top" Height="800" Width="480" Margin="0,-32,0,0" Grid.Row="0" Grid.RowSpan="2" IsHitTestVisible="False" />-->
</Grid>

BackgroundVideoBrush.SetSource(this.captureDevice);

     // Initialize variables.
        int encodedOrientation = 0;
        int sensorOrientation = (Int32)this._camera.SensorRotationInDegrees;
        switch (this.Orientation)
        {
            // Camera hardware shutter button up.
            case PageOrientation.LandscapeLeft:
                encodedOrientation = -90 + sensorOrientation;
                break;
            // Camera hardware shutter button down.
            case PageOrientation.LandscapeRight:
                encodedOrientation = 90 + sensorOrientation;
                break;
            // Camera hardware shutter button right.
            case PageOrientation.PortraitUp:
                encodedOrientation = 0 + sensorOrientation;
                break;
            // Camera hardware shutter button left.
            case PageOrientation.PortraitDown:
                encodedOrientation = 180 + sensorOrientation;
                break;
        }
        // Apply orientation to image encoding.
        this._camera.SetProperty(KnownCameraGeneralProperties.EncodeWithOrientation, encodedOrientation);