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作为一个新手程序员，我要问一个愚蠢的问题。我想在不闪烁的情况下打开 windows phone 8 的手电筒（像其他手电筒应用程序一样连续）。现在我尝试访问 Microsoft.Phone.Media.Extended 时尝试使用反射失败的示例

但它没有用。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 甚至一秒钟都没有打开手电筒。我该做什么 ？

我使用的库和代码：

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)
        {
            //
        }

我究竟做错了什么？

4

1 回答 1

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很抱歉回复晚了，之前收到但无法发布。对此感到抱歉。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“能力”
  6. 为应用启用适当的功能

为了解决我的问题，我必须启用两个功能。

  1. ID_CAP_ISV_CAMERA
  2. ID_CAP_MICROPHONE

谢谢你

于 2013-03-04T00:09:34.090 回答