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Reading GPS data from JPEG image in WPF app windows 8.1

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    Hi,

    I am developing a Windows 8.1 application using c# xaml wherein I am trying to extract latitude and longitude information from a JPEG image. I am not able extract this information. The code is as given below. please advise. Thanks you..

    var stream = await file.OpenAsync(Windows.Storage.FileAccessMode.Read);
            var bitmapImage = new Windows.UI.Xaml.Media.Imaging.BitmapImage();
            await bitmapImage.SetSourceAsync(stream);
            myImage.Source = bitmapImage;
 
            var decoder = await Windows.Graphics.Imaging.BitmapDecoder.CreateAsync(stream);

requests.Add("System.GPS.Latitude"); 
    var retrievedProps =await decoder.BitmapProperties.GetPropertiesAsync(requests);
    ushort latitude;
    if (retrievedProps.ContainsKey("System.GPS.Latitude"))
     {
    latitude = (ushort)retrievedProps["System.GPS.Latitude"].Value;
    latitudetxt.Text =Convert.ToString(latitude); }



    Friday, May 2, 2014 8:55 PM

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    Hi,

    You can refer to some codes below:

    m_imageProperties = await file.Properties.GetImagePropertiesAsync();

                string[] requests =
                {
                    "System.GPS.Latitude",        
                    "System.GPS.Longitude"          
                };

                IDictionary<string, object> retrievedProps =
                    await m_imageProperties.RetrievePropertiesAsync(requests);
 if (retrievedProps.ContainsKey("System.GPS.Latitude"))        
            {
                latitude= ((ushort)retrievedProps["System.GPS.Latitude"]).ToString();
            }
  if (retrievedProps.ContainsKey("System.GPS.Longitude"))
            {
                fNumberText = ((ushort)retrievedProps["System.GPS.Longitude"]).ToString();
            }

    And you can refer to the sample below:

    http://code.msdn.microsoft.com/windowsapps/Simple-Imaging-Sample-a2dec2b0/sourcecode?fileId=58515&pathId=195614992

    In the Scenario1_ImageProperties.xaml.cs file there are two methods you can refer to get the image file GPS data:

    LoadFileAsync

    GetImagePropertiesForDisplay

    Best Wishes！

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    Monday, May 5, 2014 2:51 AM