Capture Image using WP.1 store app

Question

I am developing an Windows Store App in WP8.1. I need to take photo through camera and save it and use it for showing but it throws exception everytime. My code is--

async private void capturePhoto_Tapped(object sender, TappedRoutedEventArgs e)
        {
            try
            {
                MediaCapture mediaCapture = new MediaCapture();

                StorageFile sf = await ApplicationData.Current.LocalFolder.CreateFileAsync("My Picture", CreationCollisionOption.GenerateUniqueName);
                ImageEncodingProperties img = new ImageEncodingProperties();
                await mediaCapture.CapturePhotoToStorageFileAsync(img, sf);
            }
            catch
            {

            }
        }

It throws an exception Object must be initailized and if I use InitalizeAsync it shows System.Exception and message is Text related to the Exception could not be found.If I use this code

private static async Task<DeviceInformation> GetCameraID(Windows.Devices.Enumeration.Panel desired)
        {
            DeviceInformation deviceID = (await DeviceInformation.FindAllAsync(DeviceClass.VideoCapture))
                .FirstOrDefault(x => x.EnclosureLocation != null && x.EnclosureLocation.Panel == desired);

            if (deviceID != null) return deviceID;
            else throw new Exception(string.Format("Camera of type {0} doesn't exist.", desired));
        }

        async private void InitCamera_Click(object sender, RoutedEventArgs e)
        {
            var cameraID = await GetCameraID(Windows.Devices.Enumeration.Panel.Back);
            var captureManager = new MediaCapture();
            await captureManager.InitializeAsync(new MediaCaptureInitializationSettings
            {
                StreamingCaptureMode = StreamingCaptureMode.Video,
                PhotoCaptureSource = PhotoCaptureSource.Photo,
                AudioDeviceId = string.Empty,
                VideoDeviceId = cameraID.Id
            });
            StorageFile sf = await ApplicationData.Current.LocalFolder.CreateFileAsync("My Picture", CreationCollisionOption.GenerateUniqueName);
            ImageEncodingProperties img = new ImageEncodingProperties();
            await captureManager.CapturePhotoToStorageFileAsync(img, sf);
        }

I found the error ------ The requested attribute was not found. (Exception from HRESULT: 0xC00D36E6)-- Can anybody help?

Link to my project named Camera

Take a look [at this answer](http://stackoverflow.com/a/23606620/2681948) also ensure that you have declared the needed capabilities. — Romasz, Feb 04 '15 at 13:11
I tried this but I got an error --------------The text associated with this error code could not be found.--------which I described in my question — , Feb 04 '15 at 13:15
Where do you get this error? Also have you debugged your program? — Romasz, Feb 04 '15 at 13:18
I did it and error is on Initailize method and CapturePhotoToStorage method and I can not find the solution to it. I have updated my code with new error all I have tried. — , Feb 04 '15 at 13:21
Does `GetCameraID` return a valid camera device? Is it possible that you can share a sample? — Romasz, Feb 04 '15 at 13:27
GetCameraID returns a valid camera device and this is my actual code which i call on tap of textblock — , Feb 05 '15 at 04:55
Is it possible that you can share a sample with the problem? — Romasz, Feb 05 '15 at 09:51
I have added my code sample in my question at the bottom with both methods — , Feb 05 '15 at 10:27

score 0 · Accepted Answer · edited May 23 '17 at 12:16

I think there are couple of problems you are facing:

you shouldn't declare MediaCapture in local scope
you should preview your photo before taking it
you should always Dispose() the MediaCapture - I think this may be the biggest problem, the first time you initialize it will work fine, but when you stop debugging you don't dispose the capture manager - in this case further initialization will fail unless you restart the phone. MediaCapture needs to be handeled carefully
also watch out not to fire Tapped event multiple times

I've tried such code and works just fine:

private bool initialized = false;
private MediaCapture captureManager;
async private void capturePhoto_Tapped(object sender, TappedRoutedEventArgs e)
{
    if (initialized) return;
    try
    {
        var cameraID = await GetCameraID(Windows.Devices.Enumeration.Panel.Back);
        captureManager = new MediaCapture();
        await captureManager.InitializeAsync(new MediaCaptureInitializationSettings
        {
            StreamingCaptureMode = StreamingCaptureMode.Video,
            PhotoCaptureSource = PhotoCaptureSource.VideoPreview,
            AudioDeviceId = string.Empty,
            VideoDeviceId = cameraID.Id
        });
        //      StorageFile sf = await ApplicationData.Current.LocalFolder.CreateFileAsync("My Picture", CreationCollisionOption.GenerateUniqueName);
        //       ImageEncodingProperties img = new ImageEncodingProperties();
        //       img = ImageEncodingProperties.CreateJpeg();
        //        await captureManager.CapturePhotoToStorageFileAsync(img, sf);
    }
    catch (Exception ex) { (new MessageDialog("An error occured")).ShowAsync(); }
}

private void OffButton_Click(object sender, RoutedEventArgs e)
{
    captureManager.Dispose();
}

I added this code but still I am not able to launch the camera. I am having trouble in even launching the camera — , Feb 10 '15 at 06:37
@Rohit Just adding the code above won't help you unless you check other things I've mentioned. Do a simple test: restart your phone, run above initialization and show preview of camera on the screen - can you see something, does it work? — Romasz, Feb 10 '15 at 08:23
I checked my code and it worked after I deleted the app and restarted it. Thanks for your help. Sometimes it throws error and needs to restart the phone — , Feb 10 '15 at 12:43
@Rohit It means that you hadn't freed the resources properly - what is the most important thing once dealing with *MediaCapture*. Keep that in mind - good luck. — Romasz, Feb 10 '15 at 13:52

Capture Image using WP.1 store app

1 Answers1