c# – Windows Phone 8.1摄像头初始化

发布时间：2020-12-16 02:03:17 所属栏目：百科来源：网络整理

导读：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();

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,在Lumia 920上使用System.UnauthorizedAccessException进行Windows.Media.Capture.MediaCapture()构造函数调用时失败,以及模拟器上的访问冲突.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.

解决方法

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;
}

（编辑：李大同）

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