WindowsPhone 8.1 FlashLight

我有诺基亚730，我想让FlashLight工作。但下一次代码崩溃：WindowsPhone 8.1 FlashLight

 MediaCapture mc = new MediaCapture(); 
     await mc.InitializeAsync(); 

      if (mc.VideoDeviceController.TorchControl.Supported == true) 
      { 
       mc.VideoDeviceController.TorchControl.Enabled = true; 
       mc.VideoDeviceController.TorchControl.PowerPercent = 100; // here is crash 
      }

任何想法？由于某些原因，旧版平台（wp 7，wp8）的解决方案完全不起作用。

来源

2016-01-23 Ted

什么意思是“代码崩溃”？有一些例外吗？如果是，哪个？ –

不支持PowerPercent – Ted

[在Windows Phone 8.1中切换手电筒]可能的副本（http://stackoverflow.com/questions/24847510/toggle-flashlight-in-windows-phone-8-1） – fillobotto

根据this post它可以帮助尝试以下操作：

//to switch OFF flash light 
mc.VideoDeviceController.FlashControl.Enabled = false; 
//to switch ON flash light 
mc.VideoDeviceController.FlashControl.Enabled = true;

来源

2016-01-23 16:17:19

不起作用.. ..也试过： _mediaDev.VideoDeviceController.FlashControl.Auto = false; _mediaDev.VideoDeviceController.FlashControl.AssistantLightEnabled = true; _mediaDev.VideoDeviceController.FlashControl.Enabled = true; – Ted

通过下面的代码修正它：

 private async void Button_Click(object sender, RoutedEventArgs e) 
    { 
     // Initialize Media Capture and Settings Objects, mediaCapture declared global outside this method 
     var mediaCapture = new MediaCapture(); 

     // Grab all available VideoCapture Devices and find rear device (usually has flash) 
     await mediaCapture.InitializeAsync(); 

     var videoEncodingProperties = MediaEncodingProfile.CreateMp4(VideoEncodingQuality.Vga); 

     var videoStorageFile = await KnownFolders.VideosLibrary.CreateFileAsync("tempVideo.mp4", CreationCollisionOption.GenerateUniqueName); 
     await mediaCapture.StartRecordToStorageFileAsync(videoEncodingProperties, videoStorageFile); 

     await Task.Delay(TimeSpan.FromMilliseconds(500)); 
     mediaCapture.VideoDeviceController.TorchControl.Enabled = true; 
    }

但由于某些原因，我应该等待500毫秒之前启用TorchControl。有人能解释为什么吗？

来源

2016-01-23 17:35:10 Ted

WindowsPhone 8.1 FlashLight

回答

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