好的,我的问题很简单.
我已经设法打开闪光灯(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？
附：
>我想象将.ons转换为.offs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.
解决方法
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,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,将其关闭：
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);
}
}