/// <summary>
/// Read the location metadata from an image file
/// </summary>
/// <returns>A list of double values, the first element is latitude, the second is longitude</returns>
public async static Task<SurveyPhoto> ReadImageMetaData(StorageFile file)
{
var requests = new List<string> { "System.GPS.Latitude", "System.GPS.Longitude", "System.Comment", "System.Photo.DateTaken" };
var retrievedProps = await file.Properties.RetrievePropertiesAsync(requests);
var res = new SurveyPhoto {ResourceName = file.Name};
foreach (var request in requests.Where(retrievedProps.ContainsKey))
{
switch (request)
{
case "System.GPS.Latitude":
res.Latitude = CoordIntArrayToDouble(retrievedProps[request] as double[]); break;
case "System.GPS.Longitude":
res.Longitude = -CoordIntArrayToDouble(retrievedProps[request] as double[]); break;
case "System.Photo.DateTaken":
res.TimeTaken = ((DateTimeOffset)retrievedProps[request]).DateTime; break;
case "System.Comment":
default:
res.SegmentSurveyId = retrievedProps[request] as string; break;
}
}
return res;
}
public SurveyPhotoWrapper(StorageFile file)
{
this.File = file;
SurveyPhoto = new SurveyPhoto();
}