Load XML Files on HoloLens in runtime

yusuf

Hello,

For my 3d maps project I'm trying load XML file that consists of the building heights and shapes. I have about 100 .xml files, and I created each of them as a serialized version of my data structure called MeshData. To load them in runtime, I got helped from @HoloSheep 's posts;

https://forums.hololens.com/discussion/comment/7133/#Comment_7133
https://forums.hololens.com/discussion/comment/10580#Comment_10580'

However, it didn't workout for me since I didn't know how and where to put my XML files in HoloLens. I cannot make my program to find the xml files, although I uploaded them in the assets of mu Unity projects. Here is my code;

    private GameObject _container;
            private void BuildVectorTile()
            {
                _container = new GameObject("Buildings");
                _container.transform.SetParent(tileObject.transform, true);
                string xmlText = "";
                Stream stream2 = null;
                //MemoryStream xmlStream = new MemoryStream();
                XmlSerializer ser = new XmlSerializer(typeof(MeshData));
                for (int i = 0; i < 99; i++) {
        #if WINDOWS_UWP
            Task task = new Task(
                async () =>
                {
                    StorageFolder folder = await StorageFolder.GetFolderFromPathAsync(MeshFolderName);
                    StorageFile file = await folder.GetFileAsync("foo0.xml");
                    //var xmlFile = await StorageFile.GetFileFromApplicationUriAsync(new Uri("ms-appx:///" + "foo" + i + ".xml"));
                    //Windows.Data.Xml.Dom.XmlDocument xdoc = await Windows.Data.Xml.Dom.XmlDocument.LoadFromFileAsync(xmlFile);
                    //xmlText = xdoc.GetXml();
                    //xdoc.Save( xmlStream );
                    stream2 = await file.OpenStreamForReadAsync();
                });
            try
            {
                task.Start();
                task.Wait();
            }
            catch (Exception e)
            {
                Debug.Log(e);
                throw;
            }
        using (var stream = stream2)
        {
            MeshData newFoo = (MeshData)ser.Deserialize(stream);
            CreateGameObject(newFoo, _container);
        } 
#else
            using (var stream = File.OpenRead("C:\\Users\\yusuf\\Documents\\FinalExported\\" + "foo" + i + ".xml"))
            {
                MeshData newFoo = (MeshData)ser.Deserialize(stream);
                CreateGameObject(newFoo, _container);
            }
#endif
        }
    }

Help please.

HoloSheep

@yusuf
If you are deploying the files with the app package, you will want to use the

await StorageFile.GetFileFromApplicationUriAsync(new Uri("ms-appx:///" + "foo" + i + ".xml"));

syntax.

Be sure to set the properties correctly on those files in visual studio:

In Visual Studio, if you right click on the file and bring up the Properties window for the file make sure it is marked as:

Build Action – Content
Copy to Output Directory – Copy if newer

HTH

yusuf

Thanks a lot @HoloSheep ! Using var xmlFile = await StorageFile.GetFileFromApplicationUriAsync(new Uri("ms-appx:///" + "foo" + i + ".xml")); , and changing the foo.xml's properties (Copy if newer), it worked!

Now I have a follow-up question though. After the above code, xmlFile returns a System.__ComObject. When I pass that object to stream2 = await xmlFile.OpenStreamForReadAsync();, and try to use the stream2 in MeshData newFoo = (MeshData)ser.Deserialize(stream2);, it gives the following error;

"There is an error in XML document (1, 31)."

Please see picture;