public static async Task <GeotaggingResult> AddGeotag(Stream image, Geoposition location)
{
var result = new GeotaggingResult()
{
OperationResult = GeotaggingResult.Result.OK,
Image = image,
};
// From UWP, a stream from HttpResponseMessage doesn't support seeking.
if (!image.CanSeek)
{
var original = image;
var seekable = new MemoryStream();
image.CopyTo(seekable);
seekable.Seek(0, SeekOrigin.Begin);
image = seekable;
original.Dispose();
}
try
{
result.Image = await MetaDataOperator.AddGeopositionAsync(image, location, false);
}
catch (GpsInformationAlreadyExistsException)
{
result.OperationResult = GeotaggingResult.Result.GeotagAlreadyExists;
}
catch
{
result.OperationResult = GeotaggingResult.Result.UnExpectedError;
}
return(result);
}
private async Task DownloadToSave(DownloadRequest req)
{
DebugUtil.Log("Download picture: " + req.Uri.OriginalString);
try
{
var geoResult = GeotaggingResult.NotRequested;
var res = await HttpClient.GetAsync(req.Uri, HttpCompletionOption.ResponseContentRead).ConfigureAwait(false);
switch (res.StatusCode)
{
case HttpStatusCode.OK:
break;
case HttpStatusCode.Gone:
req.Error.Raise(DownloaderError.Gone, geoResult);
return;
default:
req.Error.Raise(DownloaderError.Network, geoResult);
return;
}
var imageStream = await res.Content.ReadAsStreamAsync().ConfigureAwait(false);
if (req.Mediatype == Mediatype.Image && req.GeoPosition != null)
{
try
{
imageStream = await MetaDataOperator.AddGeopositionAsync(imageStream, req.GeoPosition, false);
geoResult = Utility.GeotaggingResult.OK;
}
catch (GpsInformationAlreadyExistsException)
{
geoResult = GeotaggingResult.GeotagAlreadyExists;
}
catch
{
geoResult = GeotaggingResult.UnExpectedError;
}
}
using (imageStream)
{
StorageFolder rootFolder;
switch (req.Mediatype)
{
case Mediatype.Image:
rootFolder = KnownFolders.PicturesLibrary;
break;
case Mediatype.Video:
rootFolder = KnownFolders.PicturesLibrary;
// Use Pictures folder according to the behavior of built-in Camera apps
// rootFolder = KnownFolders.VideosLibrary;
break;
default:
return;
}
var folder = await rootFolder.CreateFolderAsync(DIRECTORY_NAME, CreationCollisionOption.OpenIfExists);
var filename = string.Format(req.NameBase + "_{0:yyyyMMdd_HHmmss}" + req.extension, DateTime.Now);
var file = await folder.CreateFileAsync(filename, CreationCollisionOption.GenerateUniqueName);
using (var stream = await file.OpenAsync(FileAccessMode.ReadWrite))
{
var buffer = new byte[BUFFER_SIZE];
using (var os = stream.GetOutputStreamAt(0))
{
int read = 0;
while ((read = imageStream.Read(buffer, 0, BUFFER_SIZE)) != 0)
{
await os.WriteAsync(buffer.AsBuffer(0, read));
}
}
}
req.Completed.Raise(folder, file, geoResult);
return;
}
}
catch (Exception e)
{
DebugUtil.Log(e.Message);
DebugUtil.Log(e.StackTrace);
req.Error.Raise(DownloaderError.Unknown, GeotaggingResult.NotRequested); // TODO
}
}