IndexOutOfRangeException: AdventureGame.cs nextStates

[msa]

Hi,

I’m having an issue with the AdventureGame.cs to get the next state from keyboard input. My code is like this:

   void Update()
    {
        ManageState();
    }

    private void ManageState()
    {
        var nextStates = state.GetNextStates();

        if (Input.GetKeyDown(KeyCode.Alpha1))
        {
            state = nextStates[0];
        }
        else if (Input.GetKeyDown(KeyCode.Alpha2))
        {
            state = nextStates[1];
        }
        else if (Input.GetKeyDown(KeyCode.Alpha3))
        {
            state = nextStates[2];
        }
        textComponent.text = state.GetStateStory();
    }

And GetNextStates is defined in State.cs as:

    public State[] GetNextStates()
    {
        return nextStates;
    }

but when I run this on Unity and press the alphanumeric 1 key, I’m always getting the same error saying that the index is out of bounds.

IndexOutOfRangeException: Index was outside the bounds of the array.
AdventureGame.ManageState () (at Assets/AdventureGame.cs:54)
AdventureGame.Update () (at Assets/AdventureGame.cs:45)

Indeed, when I do Debug.Log(nextStates.Length); the value is always 0, so it seems the array is not being created properly.

How to solve this issue?
Many thanks,
Martim

[Nina]

Hi Martin,

First of all, good job on narrowing down the problem.

Indeed, when I do Debug.Log(nextStates.Length); the value is always 0, so it seems the array is not being created properly.

Check your scriptable State objects. Do all of them have State objects in their array?

[msa]

Hi Nina,

many thanks for your help. I’m on lecture 27 so there should not be many scriptable objects. The only one is in State.cs:

[CreateAssetMenu(menuName = "State")]
public class State : ScriptableObject {

    [TextArea(14, 10)] [SerializeField] string storyText;
    [SerializeField] State[] nextStates;

    public string GetStateStory() {
        return storyText;
    }

    public State[] GetNextStates() {
        return nextStates;
    }
}

I’m very new on Unity and C# scripting, what do you mean by " all of them have State objects in their array"?

[Nina]

Haven’t you created story parts in your Assets folder yet? I meant “Room 1”, “Room 2”, etc. which were created from your State object. I meant scriptable objects in Unity. What you showed is a C# class inheriting from ScriptableObject, which is a class in the Unity namespace. I know, it sounds a bit confusing but if you regard Unity and C# as two different things, a lot will become easier to grasp.

What do you have in your Assets folder? Click on all scriptable objects there, not on your State script.