Flash On / Off

Question

OK, my problem is pretty simple.

I managed to enable Flash (and save it).

However, I'm still not sure how to disable it (lol).

Here is my code:

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); } 

Any ideas?

---

PS

• I thought converting .on to .off might work, but it is not.
• This has been tested on the HTC 8S and Lumia 820.

Answer 1

It looks like you can't remove the data collector twice (I'm not sure why), so you should save it in the property:

 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); } } 

Then, to disable it:

 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

Try this one

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

Torch check exists in the device.

 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"); } 

To change the state of the burner

 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){ } }