打开/关闭闪光灯

好的，我的问题很简单。

我设法打开闪光灯（并保持打开）。

但是，我仍然不确定如何关闭它（笑）。

这是我的代码：

var sensorLocation = CameraSensorLocation.Back; try { // get the AudioViceoCaptureDevice var avDevice = await AudioVideoCaptureDevice.OpenAsync(sensorLocation, AudioVideoCaptureDevice.GetAvailableCaptureResolutions(sensorLocation).First()); // turn flashlight on var supportedCameraModes = AudioVideoCaptureDevice .GetSupportedPropertyValues(sensorLocation, KnownCameraAudioVideoProperties.VideoTorchMode); if (supportedCameraModes.ToList().Contains((UInt32)VideoTorchMode.On)) { avDevice.SetProperty(KnownCameraAudioVideoProperties.VideoTorchMode, VideoTorchMode.On); // set flash power to maxinum avDevice.SetProperty(KnownCameraAudioVideoProperties.VideoTorchPower, AudioVideoCaptureDevice.GetSupportedPropertyRange(sensorLocation, KnownCameraAudioVideoProperties.VideoTorchPower).Max); } else { turnWhiteScreen(true); } } catch (Exception ex) { // Flashlight isn't supported on this device, instead show a White Screen as the flash light turnWhiteScreen(true); } 

有任何想法吗？

---

PS

• 我想像将.on转换为.on s可能有效，但事实并非如此。
• 这已经在HTC 8S和Lumia 820上进行了测试。

Answer 1

看起来你无法检索两次采集设备（我不知道为什么），所以你应该将它存储在一个属性中：

 protected AudioVideoCaptureDevice Device { get; set; } private async void ButtonTurnOn_Click(object sender, RoutedEventArgs e) { var sensorLocation = CameraSensorLocation.Back; try { if (this.Device == null) { // get the AudioViceoCaptureDevice this.Device = await AudioVideoCaptureDevice.OpenAsync(sensorLocation, AudioVideoCaptureDevice.GetAvailableCaptureResolutions(sensorLocation).First()); } // turn flashlight on var supportedCameraModes = AudioVideoCaptureDevice .GetSupportedPropertyValues(sensorLocation, KnownCameraAudioVideoProperties.VideoTorchMode); if (supportedCameraModes.ToList().Contains((UInt32)VideoTorchMode.On)) { this.Device.SetProperty(KnownCameraAudioVideoProperties.VideoTorchMode, VideoTorchMode.On); // set flash power to maxinum this.Device.SetProperty(KnownCameraAudioVideoProperties.VideoTorchPower, AudioVideoCaptureDevice.GetSupportedPropertyRange(sensorLocation, KnownCameraAudioVideoProperties.VideoTorchPower).Max); } else { turnWhiteScreen(true); } } catch (Exception ex) { // Flashlight isn't supported on this device, instead show a White Screen as the flash light turnWhiteScreen(true); } } 

然后，关闭它：

 private void ButtonTurnOff_Click(object sender, RoutedEventArgs e) { var sensorLocation = CameraSensorLocation.Back; try { // turn flashlight on var supportedCameraModes = AudioVideoCaptureDevice .GetSupportedPropertyValues(sensorLocation, KnownCameraAudioVideoProperties.VideoTorchMode); if (this.Device != null && supportedCameraModes.ToList().Contains((UInt32)VideoTorchMode.Off)) { this.Device.SetProperty(KnownCameraAudioVideoProperties.VideoTorchMode, VideoTorchMode.Off); } else { turnWhiteScreen(false); } } catch (Exception ex) { // Flashlight isn't supported on this device, instead show a White Screen as the flash light turnWhiteScreen(false); } } 

Answer 2

试试这个

 private static VideoTorchMode _videoTorchMode = VideoTorchMode.Off; private AudioVideoCaptureDevice _videoRecordingDevice; 

检查割炬存在于设备中。

 private async void CheckTorch() { if(AudioVideoCaptureDevice.AvailableSensorLocations.Contains(CameraSensorLocation.Back) && AudioVideoCaptureDevice.GetSupportedPropertyValues(CameraSensorLocation.Back, KnownCameraAudioVideoProperties.VideoTorchMode).ToList().Contains((UInt32)VideoTorchMode.On)) { var temp = AudioVideoCaptureDevice.GetAvailableCaptureResolutions(CameraSensorLocation.Back)[0]; var resolution = new Windows.Foundation.Size(temp .Width, temp .Height); _videoRecordingDevice = await AudioVideoCaptureDevice.OpenAsync(CameraSensorLocation.Back, resolution); } else MessageBox.Show("Your device does not support torch"); } 

改变火炬状态

 private void SetTorchMode(){ try { if (BackgroundHandler.Instance.IsBackTorchExist) { if (_videoTorchMode == VideoTorchMode.Off) { _videoRecordingDevice.SetProperty(KnownCameraAudioVideoProperties.VideoTorchMode, VideoTorchMode.On); _videoTorchMode = VideoTorchMode.On; } else { _videoRecordingDevice.SetProperty(KnownCameraAudioVideoProperties.VideoTorchMode, VideoTorchMode.Off); _videoTorchMode = VideoTorchMode.Off; } } } catch (Exception ex){ } }