Włączanie i wyłączanie lampy błyskowej

Question

OK, mój problem jest dość prosty.

Udało mi się włączyć lampę błyskową (i pozostawić ją włączoną).

Jednak nadal nie jestem pewien, jak to wyłączyć (lol).

Oto mój kod:

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); 
} 

Jakieś pomysły?

---

P.S.

• Wyobrażałem sobie, że konwersja .on s do .off s mogło działało, ale tak nie jest.
• ten został przetestowany na HTC 8S i Lumia 820.

Answer 1

Wygląda na to, że nie można odzyskać urządzenie wykrywające dwukrotnie (nie jestem pewien, dlaczego), więc należy przechowywać go w nieruchomości :

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); 
    } 
} 

Następnie, aby go wyłączyć:

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

Spróbuj jeden

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

Sprawdź latarkę w urządzeniu.

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"); 
} 

do zmiany stanu latarka

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){ } 
}