c#4.0-Windows Phone 8(HTC 8X)手电筒无法打开(不使用相机)

Question

作为一名新手程序员，我要问一个愚蠢的问题。我想打开windows phone 8的手电筒而不闪烁(像其他手电筒应用程序一样连续(。现在我尝试使用
的示例尝试访问Microsoft时反射失败。电话媒体扩展

但它没有起作用。我创建了一个名为"flash"的按钮并粘贴代码。它编译得很好，但我的设备HTC 8X甚至一秒钟都不打开手电筒。我该怎么办？

图书馆&我使用的代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Navigation;
using Microsoft.Phone.Controls;
using Microsoft.Phone.Shell;
using Flashlight_V_0._1.Resources;
using Microsoft.Phone.Media;
using Windows.Phone.Media.Capture; 
using Microsoft.Xna.Framework.Media;
using System.IO;                     
namespace Flashlight_V_0._1
{
    public partial class MainPage : PhoneApplicationPage
    {
        // Constructor
        public MainPage()
        {
            InitializeComponent();
            // Sample code to localize the ApplicationBar
            //BuildLocalizedApplicationBar();
        }
        private async void Button_Click_1(object sender, RoutedEventArgs e)
        {
            var sensorLocation = CameraSensorLocation.Back;
            try
            {
                // get the AudioViceoCaptureDevice
                var avDevice = await AudioVideoCaptureDevice.OpenAsync(sensorLocation,
                    AudioVideoCaptureDevice.GetAvailableCaptureResolutions(sensorLocation).First());
                // turn flashlight on
                var supportedCameraModes = AudioVideoCaptureDevice
                    .GetSupportedPropertyValues(sensorLocation, KnownCameraAudioVideoProperties.VideoTorchMode);
                if (supportedCameraModes.ToList().Contains((UInt32)VideoTorchMode.On))
                {
                    avDevice.SetProperty(KnownCameraAudioVideoProperties.VideoTorchMode, VideoTorchMode.On);
                    // set flash power to maxinum
                    avDevice.SetProperty(KnownCameraAudioVideoProperties.VideoTorchPower,
                        AudioVideoCaptureDevice.GetSupportedPropertyRange(sensorLocation, KnownCameraAudioVideoProperties.VideoTorchPower).Max);
                }
                else
                {
                    //ShowWhiteScreenInsteadOfCameraTorch();
                }
            }
            catch (Exception ex)
            {
                // Flashlight isn't supported on this device, instead show a White Screen as the flash light
                //ShowWhiteScreenInsteadOfCameraTorch();
            }
        }
    }
}

我也试过这个：

        try
        {
            var _device = await AudioVideoCaptureDevice.OpenAsync(CameraSensorLocation.Back, AudioVideoCaptureDevice.GetAvailableCaptureResolutions(CameraSensorLocation.Back).First());
            _device.SetProperty(KnownCameraAudioVideoProperties.VideoTorchMode, VideoTorchMode.On);
        }
        catch (Exception ex)
        {
            //
        }

我做错了什么？

Answer 1

很抱歉回复晚了，之前收到了，但无法发布。抱歉。WP7/WP7.5默认访问所有传感器。但在WP8中，您必须手动启用传感器功能。

1. 转到解决方案资源管理器
2. 选择项目
3. 选择属性->WMAppManifest.xml
4. 双击"WMAppManifest.xml">
5. 选择"功能">
6. 为应用程序启用适当的功能

为了解决我的问题，我必须启用两种功能。

1. ID_CAP_ISV_camer
2. ID_CAP_麦克风

感谢