[英]What should I do to access camera in a UWP application using MediaCapture?
[英]UWP MediaCapture Denied Access to Camera
我正在尝试制作一个允许我拉起相机的项目,但我被告知每次程序运行时我都被拒绝访问相机。 我从以下链接https://msdn.microsoft.com/en-us/library/windows/apps/mt243896.aspx通读了教程并对代码进行了一些小的更改,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用于应用程序。 有谁知道为什么它不起作用?
从清单文件中添加麦克风和相机属性。 清单文件应仅存在于项目中。 搜索功能选项卡并检查相关选项
使用StreamingCaptureMode = StreamingCaptureMode.Video
仅请求访问相机,如下所示:
await _mediaCapture.InitializeAsync(new MediaCaptureInitializationSettings
{
StreamingCaptureMode = StreamingCaptureMode.Video
});
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