UWP MediaCapture拒绝进入照相机

Question

我试图做一个项目，让我可以拉相机，但我被告知，我被拒绝了相机每次运行程序。我从下面的链接https://msdn.microsoft.com/en-us/library/windows/apps/mt243896.aspx中阅读了本教程，并对代码做了一些微小的更改，但这些更改不应影响结果

    private MediaCapture _mediaCapture;
    private bool _isInitialized;

  private async Task InitializeCameraAsync()
    {
        if (_mediaCapture == null)
        {
            // Get available devices for capturing pictures
            var allVideoDevices = await DeviceInformation.FindAllAsync(DeviceClass.VideoCapture);

            // Get the desired camera by panel
            DeviceInformation cameraDevice =
                allVideoDevices.FirstOrDefault(x => x.EnclosureLocation != null &&
                x.EnclosureLocation.Panel == Windows.Devices.Enumeration.Panel.Back);

            // If there is no camera on the specified panel, get any camera
            cameraDevice = cameraDevice ?? allVideoDevices.FirstOrDefault();

            if (cameraDevice == null)
            {
                Debug.WriteLine("No camera device found.");
                return;
            }

            // Create MediaCapture and its settings
            _mediaCapture = new MediaCapture();

            MediaCaptureInitializationSettings mediaInitSettings = new MediaCaptureInitializationSettings {
                VideoDeviceId = cameraDevice.Id
              };

            // Initialize MediaCapture
            try
            {
                await _mediaCapture.InitializeAsync(mediaInitSettings);
                _isInitialized = true;
            }
            catch (UnauthorizedAccessException)
            {
                Debug.WriteLine("The app was denied access to the camera");
            }
            catch (Exception ex)
            {
                Debug.WriteLine("Exception when initializing MediaCapture with {0}: {1}", cameraDevice.Id, ex.ToString());
            }

            // If initialization succeeded, start the preview
            if (_isInitialized)
            {
                // Figure out where the camera is located
                if (cameraDevice.EnclosureLocation == null || cameraDevice.EnclosureLocation.Panel == Windows.Devices.Enumeration.Panel.Unknown)
                {
                    // No information on the location of the camera, assume it's an external camera, not integrated on the device
                    _externalCamera = true;
                }
                else
                {
                    // Camera is fixed on the device
                    _externalCamera = false;

                    // Only mirror the preview if the camera is on the front panel
                    _mirroringPreview = (cameraDevice.EnclosureLocation.Panel == Windows.Devices.Enumeration.Panel.Front);
                }

                await StartPreviewAsync();

            }
        }
    }

此外，我确保我的相机允许访问应用程序。有人知道为什么它不起作用吗？

Answer 1

从Manifest文件中添加麦克风和照相机属性。清单文件只存在于项目中。搜索功能选项卡并检查相关选项

Answer 2

使用StreamingCaptureMode = StreamingCaptureMode.Video只请求访问照相机，如下所示：

await _mediaCapture.InitializeAsync(new MediaCaptureInitializationSettings
{
    StreamingCaptureMode = StreamingCaptureMode.Video 
});