applejag/Newtonsoft.Json-for-Unity

JsonSerializationException

jayp84847 opened this issue · 5 comments

jayp84847 commented

I am using json in my unity project. Everything works good in unity editor.

But when I build it for android it shows me this error.

Please guide me in it.

20210518_191940
20210518_191956

This is the code

DeepAI_API api = new DeepAI_API(apiKey: "quickstart-QUdJIGlzIGNvbWluZy4uLi4K");

StandardApiResponse resp = api.callStandardApi("torch-srgan", new {
        image = File.OpenRead("C:\\path\\to\\your\\file.jpg"),
});
applejag commented

Hi @jayp84847! Thanks for reaching out!

At first glance my guess is that the error originates from the code stripping that Unity does on some platforms. My guess is that api.callStandardApi does something like JsonConvert.DeserializeObject<StandardApiResponse>(responseBody), and so given that, adding something like the following should resolve your issue:

// Save this somewhere inside your Assets folder
// No need to add it to the scene, it just needs to be included
// in the compilation
using Newtonsoft.Json.Utilities;
using UnityEngine;
 
public class AotTypeEnforcer : MonoBehaviour
{
    public void Awake()
    {
        AotHelper.EnsureType<DeepAI.StandardApiResponse>();
    }
}

In short: Unity trims aways some methods, constructors, properties, and types that it thinks are unused, just to trim down the build size. Unity does not understand it needs to keep the constructors of the types when deserializing.

You can read more on this here:

jayp84847 commented
applejag commented

Sounds like Unity is trimming away your properties as well.

Instead of using AotHelper, you could try adding a link.xml file instead.

Add this file somewhere inside your Assets folder. The name must be link.xml (must be lower-cased)

<linker>
    <!-- Assuming here your assembly name is DeepAI -->
    <assembly fullname="DeepAI">
        <type fullname="DeepAI.StandardApiResponse" />
    </assembly>
</linker>

Further reading on link.xml files: https://github.com/jilleJr/Newtonsoft.Json-for-Unity/wiki/Fix-AOT-using-link.xml

jayp84847 commented
  • 🎉1
applejag commented

Glad to help :)