Reflection failure when attempting to access Microsoft.Phone.Media.Extended

Question

I am developing one Flash Light application in Silverlight for windows phone 8. Currently I am deeply stuck in one issue for the use of \"Microsoft.Phone.Media.Extended\" a

Answer 1

Microsoft.Phone.Media.Extended is a private API in WP7 that wasn't meant to be used by 3rd party developers. That API doesn't exist or works on WP8.

For WP8 flashlight use the AudioVideoCaptureDevice known property of VideoTorchMode=On. Also, make sure to handle failures like exceptions or devices that don't have a Camera Torch by showing a white screen.

Here's a code sample that turns on the camera flash on my Lumia 820 and Lumia 920:

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
    {
        ShowWhiteScreenInsteadOfCameraTorch();
    }

}
catch(Exception ex)
{
    // Flashlight isn't supported on this device, instead show a White Screen as the flash light
    ShowWhiteScreenInsteadOfCameraTorch();
}

Make sure to add the required capabilities and requirements to your WP8 app when using the camera torch (ISV_Camera, Microphone, and ID_REQ_BACK_Camera).