share SpatialAnchor in UWP app

mor_sayag

Hi everyone,

I'm trying to share an Anchor using SpatialAnchorTransferManager.
I export the anchor with this code and it seems to go well:
private static async void ExportAnchors(List anchors,string fileName)
{
var folder = ApplicationData.Current.LocalFolder;
using (Stream stream = OpenFileForWriting(folder, fileName.Substring(0, fileName.LastIndexOf(".obj")) + ".sanchors").Result)
{
using (StreamWriter writer = new StreamWriter(stream))
{
foreach (ManagedSpatialAnchor anchor in anchors)
{
MemoryStream mstream = new MemoryStream(1 * 1024);
Dictionary<string, SpatialAnchor> map = new Dictionary<string, SpatialAnchor>(1)
{
{anchor.index.ToString(), anchor.anchor}
};
bool success = await SpatialAnchorTransferManager.TryExportAnchorsAsync(map, mstream.AsOutputStream());
if (success)
{
byte[] anchorDataBytes = mstream.ToArray();
writer.WriteLine(string.Format("sa {0}", BitConverter.ToString(anchorDataBytes).Replace("-", "")));
}
}
}
}
}

in import anchorsMap is null:
private async void LoadOldAnchors()
{
var status = await SpatialAnchorTransferManager.RequestAccessAsync();
m_oldanchors = new List();
var files = await ApplicationData.Current.LocalFolder.GetFilesAsync();
var filesList =files.ToList();
foreach (var file in files)
{
if (file.Name.Contains(".sanchors"))
{
using (Stream stream = await file.OpenStreamForReadAsync())
{
using (StreamReader reader = new StreamReader(stream))
{
SpatialAnchor spatialAnchor;
while(!reader.EndOfStream)
{
string line = reader.ReadLine();
switch(line.Substring(0,2))
{
case "sa":
int start = 3;
int length = (line.Length - start) / 2;
byte[] anchorDataBytes = new byte[length];
for (int i=0; i<length;i++)
{
anchorDataBytes[i] = (byte)(GetHexVal(line[2 * i + 1+start]) + (GetHexVal(line[2 * i+start]) << 4));
}
MemoryStream memoryStream = new MemoryStream(anchorDataBytes);
IInputStream inputStream = memoryStream.AsInputStream();
var importAnchorOperation = SpatialAnchorTransferManager.TryImportAnchorsAsync(inputStream);
importAnchorOperation.Completed = (asyncInfo, asyncStatus) =>
{
switch (asyncStatus)
{
case AsyncStatus.Completed:
var anchorsMap = asyncInfo.GetResults();
spatialAnchor = anchorsMap.Values.ToList()[0];
m_oldanchors.Add(spatialAnchor);
break;
case AsyncStatus.Canceled:
break;
case AsyncStatus.Error:
break;
case AsyncStatus.Started:
break;
}
};
break;
}
}
}
}
break;
}
}
await Task.Run(() => ClearStorageFolder());
}

do you know how to solve it?
thanks