在用于Windows Phone 8.1的Visual Studio 13上开发简单相机应用程序时激活主相机？

Question

I am a beginner and a student who is just introduced to the WP app development, and as for my first project, I decided to build a very simple camera app, with limited functionality. So far, I have my GUI ready, and my question is, how do I activate the main camera ( or switch between the front and the main cameras )? This is my code on the OnNavigatedTo section which opens up the front camera of the phone.

protected async override void OnNavigatedTo(NavigationEventArgs e)
{
    Windows.Phone.UI.Input.HardwareButtons.BackPressed += BackButtonPress;

    media = new MediaCapture();

    await media.InitializeAsync();

    ////rotation

    media.SetPreviewRotation(VideoRotation.Clockwise270Degrees);

    // VideoRotation previewRotation = media.GetPreviewRotation();

    ////start Capture preview

    ////capturePreview is a CaptureElement defined in XAML.

    this.capPrev.Source = media;

    await media.StartPreviewAsync();
}

I might be missing a simple line of code, that I am not aware of. My app right now launches the front camera instead of the main. What should I do to switch to the main camera? (I have the switch button ready on the appbar, which currently does nothing). Thank you

Answer 1

Welcome to Stackoverflow.

First I didn't get what you wrote in your code.

Here is the Sample & article for your requirement Still if you face any issue please be specify your problem.

Best of luck

Answer 2

You can enumerate cameras using below given line.

var set = new MediaCaptureInitializationSettings();
var devices = await DeviceInformation.FindAllAsync(DeviceClass.VideoCapture);
set.VideoDeviceId = devices[0].Id;   // You should choose any value from devices collection

media = new MediaCapture();
await media.InitializeAsync(set);

Don't forget to dispose camera in OnNavigatedFrom event.

protected async override void OnNavigatedFrom(NavigationEventArgs e)
{
    await _camCapture.StopPreviewAsync();
    media.Dispose();
}