Question

是否可以在WP7中打开相机的闪光灯？

Answer 1

现在可以在Windows Phone OS 7.1 SDK中使用。

PhotoCamera cam = new Microsoft.Devices.PhotoCamera(CameraType.Primary);
cam.FlashMode = FlashMode.On;

Answer 2

这不能在当前的SDK中以编程方式完成。

用户可以通过手机独家控制此功能。

Answer 3

嗨看看这个链接。我认为你的问题有帮助

http://msdn.microsoft.com/en-us/library/hh202949%28v=vs.92%29.aspx

Answer 4

1）在主页面XAML文件MainPage.xaml中，在名为ShutterButton的Button元素下面的StackPanel元素中添加以下代码。此代码是相机闪光灯的按钮。

<Button Name="FlashButton" Content="Fl:TBD" Click="changeFlash_Clicked" FontSize="26" FontWeight="ExtraBold" Height="75"/>

2）打开主页面的代码隐藏文件MainPage.xaml.cs，并在MainPage类构造函数上面添加以下变量声明：

//保持当前的闪光模式。

private string currentFlashMode;

3）在MainPage.xaml.cs中，将以下代码添加到OnNavigatedTo方法，就在Disable UI注释的正下方。

FlashButton.IsEnabled = false;

4）在MainPage.xaml.cs中，将以下代码添加到cam_Initialized方法，就在txtDebug语句的下面：

//设置flash按钮文字。

FlashButton.Content = "Fl:" + cam.FlashMode.ToString();

此代码显示FlashButton按钮上的当前闪光模式。

5）在MainPage.xaml.cs中，将以下代码添加到MainPage类。此代码通过在每次按下按钮时切换到不同的闪存模式来实现changeFlash_Clicked的事件处理程序。

// Activate a flash mode.
// Cycle through flash mode options when the flash button is pressed.
private void changeFlash_Clicked(object sender, RoutedEventArgs e)
{

    switch (cam.FlashMode)
    {
        case FlashMode.Off:
            if (cam.IsFlashModeSupported(FlashMode.On))
            {
                // Specify that flash should be used.
                cam.FlashMode = FlashMode.On;
                FlashButton.Content = "Fl:On";
                currentFlashMode = "Flash mode: On";
            }
            break;
        case FlashMode.On:
            if (cam.IsFlashModeSupported(FlashMode.RedEyeReduction))
            {
                // Specify that the red-eye reduction flash should be used.
                cam.FlashMode = FlashMode.RedEyeReduction;
                FlashButton.Content = "Fl:RER";
                currentFlashMode = "Flash mode: RedEyeReduction";
            }
            else if (cam.IsFlashModeSupported(FlashMode.Auto))
            {
                // If red-eye reduction is not supported, specify automatic mode.
                cam.FlashMode = FlashMode.Auto;
                FlashButton.Content = "Fl:Auto";
                currentFlashMode = "Flash mode: Auto";
            }
            else 
            {
                // If automatic is not supported, specify that no flash should be used.
                cam.FlashMode = FlashMode.Off;
                FlashButton.Content = "Fl:Off";
                currentFlashMode = "Flash mode: Off";
            }
            break;
        case FlashMode.RedEyeReduction:
            if (cam.IsFlashModeSupported(FlashMode.Auto))
            {
                // Specify that the flash should be used in the automatic mode.
                cam.FlashMode = FlashMode.Auto;
                FlashButton.Content = "Fl:Auto";
                currentFlashMode = "Flash mode: Auto";
            }
            else
            {
                // If automatic is not supported, specify that no flash should be used.
                cam.FlashMode = FlashMode.Off;
                FlashButton.Content = "Fl:Off";
                currentFlashMode = "Flash mode: Off";
            }
            break;
        case FlashMode.Auto:
            if (cam.IsFlashModeSupported(FlashMode.Off))
            {
                // Specify that no flash should be used.
                cam.FlashMode = FlashMode.Off;
                FlashButton.Content = "Fl:Off";
                currentFlashMode = "Flash mode: Off";
            }
            break;
    }

    // Display current flash mode.
    this.Dispatcher.BeginInvoke(delegate()
    {
        txtDebug.Text = currentFlashMode;
    });
}

在WP7中打开相机闪光灯

4 个答案: