Windows Phone 8.1摄像头初始化

Question

我知道有更多重复的问题，但请，这对我来说非常重要。 我现在很难用Windows Phone 8.1 C＃相机初始化。

async private void InitCamera_Click(object sender, RoutedEventArgs e)
    {
        captureManager = new MediaCapture();
        await captureManager.InitializeAsync();

         try 
        {
            captureManager = new Windows.Media.Capture.MediaCapture();
            await captureManager.InitializeAsync();

            if (captureManager.MediaCaptureSettings.VideoDeviceId != "" && captureManager.MediaCaptureSettings.AudioDeviceId != "") 
            {
                System.Diagnostics.Debug.WriteLine("Init successful");


                captureManager.RecordLimitationExceeded += new Windows.Media.Capture.RecordLimitationExceededEventHandler(RecordLimitationExceeded);
                captureManager.Failed += new Windows.Media.Capture.MediaCaptureFailedEventHandler(Failed); 
            } 
            else 
            {
                System.Diagnostics.Debug.WriteLine("No Device");
            } 
        }
         catch (Exception exception)
         {
             System.Diagnostics.Debug.WriteLine("Exception raised!!!!:" + exception);
         } 
    }

这是我初始化相机的代码，但由于某种原因，它在Lumia 920上使用System.UnauthorizedAccessException Windows.Media.Capture.MediaCapture()构造函数调用失败，并且在模拟器上也是访问冲突。 我已经用Google搜索了这个问题，但到目前为止还没有答案。 有些人告诉我不仅应该启用网络摄像头，还要启用麦克风，但这并没有解决我的问题。 一切似乎设置得很好，所有访问权限都在app清单中授予。 另外我想问你，如果你有一些很好的工作实例/教程用相机拍照，请提供。

Answer 1

下面是我的相机捕获代码，它有效，我在商店中提交了一个应用程序：

private MediaCapture mediaCapture = null;
private async Task StartCapture()
{
  string error = null;

  try
  {
    if (mediaCapture == null)
    {
      mediaCapture = new MediaCapture();
      mediaCapture.Failed += mediaCapture_Failed;

      var _deviceInformation = await GetCameraDeviceInfoAsync(Windows.Devices.Enumeration.Panel.Back);

      var settings = new MediaCaptureInitializationSettings();
      settings.StreamingCaptureMode = StreamingCaptureMode.Video;
      settings.PhotoCaptureSource = PhotoCaptureSource.VideoPreview;
      settings.AudioDeviceId = "";
      if (_deviceInformation != null)
          settings.VideoDeviceId = _deviceInformation.Id;

      await mediaCapture.InitializeAsync(settings);

      var focusSettings = new FocusSettings();
      focusSettings.AutoFocusRange = AutoFocusRange.FullRange;
      focusSettings.Mode = FocusMode.Auto;
      focusSettings.WaitForFocus = true;
      focusSettings.DisableDriverFallback = false;

      mediaCapture.VideoDeviceController.FocusControl.Configure(focusSettings);
      await mediaCapture.VideoDeviceController.ExposureControl.SetAutoAsync(true);

      mediaCapture.SetPreviewRotation(VideoRotation.Clockwise90Degrees);
      mediaCapture.SetRecordRotation(VideoRotation.Clockwise90Degrees);
    }

    captureReceipt.Source = mediaCapture;
    await mediaCapture.StartPreviewAsync();
  }
  catch (Exception ex)
  {
    DisposeMediaCapture();
    error = ex.Message;
  }

  if (error != null)
  {
    await (new MessageBoxImpl()).ShowMessageAsync(error);
  }
}

private static async Task<DeviceInformation> GetCameraDeviceInfoAsync(Windows.Devices.Enumeration.Panel desiredPanel)
{

  DeviceInformation device = (await DeviceInformation.FindAllAsync(DeviceClass.VideoCapture))
      .FirstOrDefault(d => d.EnclosureLocation != null && d.EnclosureLocation.Panel == desiredPanel);

  if (device == null)
  {
    throw new InvalidOperationException(string.Format(CultureInfo.InvariantCulture, "No suitable devices found for the camera of type {0}.", desiredPanel));
  }
  return device;
}