在试图在这里按照指示- http://msdn.microsoft.com/en-us/library/hh202949.aspx我已经编写了一个非常简单的WP7应用打开相机闪光灯。 一切似乎工作，除....闪光灯不激活。
我的手机是三星SGH-I917（最新的OS更新），我现在用的是WP7 SDK 7.1，我检查了我的相机的闪光灯实际上做的工作。 我还检查，以确保以下是在WMAppManifest.xml文件。
<Capability Name="ID_CAP_ISV_CAMERA" />
该MessageBox使用您在下面我的代码看，表明相机对象已正确初始化，则支持flashmode和FlashMode.On已设置。 但是......没有闪光灯实际上将开启。 我在想什么？
下面是代码：
public partial class MainPage : PhoneApplicationPage
{
PhotoCamera cam;
public MainPage()
{
InitializeComponent();
}
protected override void OnNavigatedTo(System.Windows.Navigation.NavigationEventArgs e)
{
cam = new PhotoCamera(CameraType.Primary);
cam.Initialized += new EventHandler<CameraOperationCompletedEventArgs>(cam_Initialized);
cam.CaptureCompleted += new EventHandler<CameraOperationCompletedEventArgs>(cam_CaptureCompleted);
cam.CaptureImageAvailable += new EventHandler<ContentReadyEventArgs>(cam_CaptureImageAvailable);
cam.CaptureThumbnailAvailable += new EventHandler<ContentReadyEventArgs>(cam_CaptureThumbnailAvailable);
viewfinderBrush.SetSource(cam);
}
void cam_CaptureThumbnailAvailable(object sender, ContentReadyEventArgs e)
{
return;
}
void cam_CaptureImageAvailable(object sender, ContentReadyEventArgs e)
{
return;
}
void cam_CaptureCompleted(object sender, CameraOperationCompletedEventArgs e)
{
return;
}
protected override void OnNavigatingFrom(System.Windows.Navigation.NavigatingCancelEventArgs e)
{
if (cam != null)
{
cam.Dispose();
cam.Initialized -= cam_Initialized;
cam.CaptureCompleted -= cam_CaptureCompleted;
cam.CaptureImageAvailable -= cam_CaptureImageAvailable;
cam.CaptureThumbnailAvailable -= cam_CaptureThumbnailAvailable;
}
}
void cam_Initialized(object sender, CameraOperationCompletedEventArgs e)
{
this.Dispatcher.BeginInvoke(delegate()
{
MessageBox.Show("Cam Init, FlashMode.On Supported?: " + cam.IsFlashModeSupported(FlashMode.On).ToString());
});
return;
}
private void Button_Click(object sender, RoutedEventArgs e)
{
if(cam.FlashMode == FlashMode.On)
cam.FlashMode = FlashMode.Off;
else
cam.FlashMode = FlashMode.On;
this.Dispatcher.BeginInvoke(delegate()
{
MessageBox.Show(cam.FlashMode.ToString());
});
}
}
这里是XAML：
<phone:PhoneApplicationPage
x:Class="PhoneApp1.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" d:DesignWidth="480" d:DesignHeight="768"
FontFamily="{StaticResource PhoneFontFamilyNormal}"
FontSize="{StaticResource PhoneFontSizeNormal}"
Foreground="{StaticResource PhoneForegroundBrush}"
SupportedOrientations="Portrait" Orientation="Portrait"
shell:SystemTray.IsVisible="True">
<Grid x:Name="LayoutRoot" Background="Transparent">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<StackPanel x:Name="TitlePanel" Grid.Row="0" Margin="12,17,0,28">
<TextBlock x:Name="ApplicationTitle" Text="" Style="{StaticResource PhoneTextNormalStyle}"/>
<TextBlock x:Name="PageTitle" Text="FlashLite" Margin="9,-7,0,0" Style="{StaticResource PhoneTextTitle1Style}"/>
</StackPanel>
<Canvas x:Name="viewfinderCanvas" HorizontalAlignment="Center" >
<Canvas.Background>
<VideoBrush x:Name="viewfinderBrush" />
</Canvas.Background>
</Canvas>
<Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0">
<Button Width="200" Height="100" Content="Flash" Click="Button_Click" />
</Grid>
</Grid>
