Json Top Level

Hello Folks,

currently I am trying to import a top level array json file..
The issue is: it runs in unity editor w/o any issue but when I execute a Windows Store hololens build I got this error:

InvalidOperationException: Handle is not initialized.​

at System.Runtime.InteropServices.GCHandle.FromIntPtr(IntPtr value)
at UnityEngine.Internal.$MethodUtility.CreateInstanceAndInvokeDefaultConstructor(IntPtr type, UIntPtr argument0, Int64* argument1)
at UnityEngineProxy.InternalCalls.PInvokeCalls.JsonUtility_CUSTOM_FromJson(IntPtr param_0, Int32 param_1, Int64& outExceptionHandle)
at UnityEngineProxy.InternalCalls.JsonUtility_CUSTOM_FromJson(String json, Type type)
at UnityEngine.JsonUtility.FromJson[T](String json)
at Json.JsonHelper.getJsonArray[T](String json)
at Richy.Data.Memory.loadDummyData()
at Richy.Data.Memory..ctor(Boolean loadDummyData)
at Richy.RichyBehavior.Start()
at Richy.RichyBehavior.$Invoke19(Int64 instance, Int64* args)
at UnityEngine.Internal.$MethodUtility.InvokeMethod(Int64 instance, Int64* args, IntPtr method)
(Filename: <Unknown> Line: 0)

The point of error is:
Wrapper<T> wrapper = JsonUtility.FromJson<Wrapper<T>> (newJson);

newJson parameter contains, what it should and as said it runs either in UnityEditor or in a normal Windows build, but for Windows Store it won´t run.
Interestingly when I don´t use a top level array json it works as well.

In particular

Code (CSharp):

1.  
2.         public static T loadJsonObject<T>(string jsonFileName) {
3.             //Json Top Level Array Type
4.             string jsonString = JsonHelper.LoadJsonResource (jsonFileName);
5.             T jsonObject  = JsonUtility.FromJson<T> (jsonString);
6.             return jsonObject;
7.         }

Additional information:

File content of wishlist.json (path project/assets/resources/json/wishlist.json)
[
{ "name": "BMW", "price": 41000, "desc": "New BMW."},
{ "name": "Haus", "price": 750000, "desc": "House"},
{ "name": "Hifi anlage", "price": 1000, "desc": "mega Bass." }
]

I build a json helper to load top-level array json files:

Code (CSharp):

1.   public static T[] getJsonArray<T>(string json)
2.         {
3.             string newJson = "{ \"array\": " + json + "}";
4.             Wrapper<T> wrapper = JsonUtility.FromJson<Wrapper<T>> (newJson);
5.             return wrapper.array;
6.         }
7.  
8.         [Serializable]
9.         private class Wrapper<T>
10.         {
11.             public T[] array;
12.         }

The wrapper class for wishlist:

Code (CSharp):

1. using System;
2. using UnityEngine;
3.  
4. namespace Richy.Data
5. {
6.     [Serializable]
7.     public class Wishlist
8.     {
9.         public string name;
10.         public float price;
11.         public string desc;
12.    
13.         public Wishlist (string name, float price, string desc)
14.         {
15.             this.name = name;
16.             this.price = price;
17.             this.desc = desc;      
18.         }  
19.  
20.         public static Wishlist CreateFromJSON(string jsonString)
21.         {
22.             return JsonUtility.FromJson<Wishlist>(jsonString);
23.         }
24.  
25.         override public string ToString() {
26.             return "name: " + this.name +  " price: " + this.price + " desc: " + this.desc;
27.         }
28.     }
29. }

I am not sure what the problem is. My assumption is that it has something to do with different DotNet version used for Windows Store Project.

Hopefully sb. can help.

 

Thank you I will post a bug report and I have added you the json helper file, where I import the json files.

 

But does this explain why it runs in editor and NOT in the hololens Project?
Actually I call the helper like this:
this.wishlist = JsonHelper.loadJsonArray<Wishlist> ("wishlist.json");

and during runtime the generic type / datatype is fixed isn´t it?!

 

yes. Actually I did it the above mentioned way, because of this thread (referring to ffleureys answer).
https://forum.unity3d.com/threads/how-to-load-an-array-with-jsonutility.375735/

 

ok, for me it also works in a "normal" windows build (but not with Microsoft Store)

 

Hi,
so basically there is no chance to convert .json Files with top level array in it, to Objects on the HoloLens?

thanks.

 

Hey Heromanic,
I have exactly the same issue. It works perfectly in the Unity Editor, but it crashes on the Hololens.
Did you find any solution for your Problem?
Thank you in advance.