Is it possible that variable value is saved between Play Modes without me knowing?

Question

Hi, I have problem with my script that is storing amount of currency (currency is dropped when enemy is killed). Method changeQuantity() is called from script attached to Player when enemy is killed and is incremented by one.

The problem is that it seems like the script is somehow "carrying" essenceQuantity from previous Play Mode. For example, when I enter Play Mode and kill one enemy, the essenceQuantity = 1. When I exit and enter Play Mode again, after killing one enemy, the essenceQuantity = 2 and so on. alt text Screens were taken in two Play Modes after killing one enemy.

 public class Blood_Essence_Quantity_Script : MonoBehaviour
 {
     private int essenceQuantity;
 
     void Awake()
     {
         essenceQuantity = 0;
         Debug.Log("Quantity after Awake = " + essenceQuantity);
         gameObject.GetComponent<Text>().text = essenceQuantity.ToString();
     }
 
     public void changeQuantity(int quantityDiference)
     {
         Debug.Log(quantityDiference);
         essenceQuantity = essenceQuantity + quantityDiference;
         Debug.Log("Quantity after killing enemy = " + essenceQuantity);
         gameObject.GetComponent<Text>().text = essenceQuantity.ToString();
     }
 }

Answer 1

Best Answer

Answer by andrew-lukasik · May 13, 2021 at 10:07 AM

To crack this elusive mystery-case, replace:

 private int essenceQuantity;

with:

 int __essenceQuantity = 0;// don't touch this;
 int essenceQuantity
 {
     get
     {
         Debug.Log($"{nameof(essenceQuantity)}.get called, value: {__essenceQuantity}",gameObject);
         return __essenceQuantity;
     }
     set
     {
         // read message callstack for details
         Debug.Log($"<b>{nameof(essenceQuantity)}.set called, new value: {value}</b>",gameObject);
         __essenceQuantity = value;
     }
 }

~~My bet is on this component being disabled, so Awake is never called~~. Second piece of the puzzle, logs, will tell the rest of the story.

TL;DR: This component was part of a prefab asset and not a scene gameObject so it's fields never resets.

Add comment · Show 8 · Share

drapi · May 13, 2021 at 10:37 AM 0

Share

I did as you told. I tested this in two Play Modes and this is the result. Is it possible for Awake() not to be called? Because Debug.Log("Quantity after Awake = " + essenceQuantity); was printed every time.

alt text

img1.png (21.2 kB)

img2.png (20.3 kB)

andrew-lukasik drapi · May 13, 2021 at 10:53 AM 0

Share

What happened here ? Are these even co$$anonymous$$g from the same object ?

essenceQuatity.get called, value:0

essenceQuatity.get called, value:1

(lower image)

What we know for sure so far is:

Magic does not exists; there are only bugs.
essenceQuantity changes between Awake and changeQuantity calls... magically

Are you 100% sure you're not accessing __essenceQuantity from anywhere else?

(other that that two places in essenceQuantity property get/set)

drapi andrew-lukasik · May 13, 2021 at 12:28 PM 0

Share

I'm 100% sure that I change essenceQuantity only in public class Blood_Essence_Quantity_Script.
Since I'm beginner, I missed one fact, that could be important. The thing is that when I'm outside of Play Mode, inspector shows this. During testing in Play Mode the value of essenceQuantity (or _essenceQuantity here) is normaly incremented.

img3.png (9.8 kB)

Show more comments

Answer 2

Answer by pradeeppurigoswami7 · May 13, 2021 at 05:55 AM

Yes they are using two method to save data in online and offline without knowing...

Integrated unity saving system provided by unityClick for view video
You are used the C# Programble method linkClick View video

Add comment · Show 2 · Share

pradeeppurigoswami7 · May 13, 2021 at 07:27 AM 0

Share

Problem in the Method :- like "essenceQuantity" is contain Value allready so The Value is increase so firstly Check This Method and related the method only class public void changeQuantity(int quantityDiference) { Debug.Log(quantityDiference); essenceQuantity = essenceQuantity + quantityDiference; Debug.Log("Quantity after killing enemy = " + essenceQuantity); gameObject.GetComponent().text = essenceQuantity.ToString(); }

drapi pradeeppurigoswami7 · May 13, 2021 at 09:25 AM 0

Share

I tried to look at it in debug mode and I found out that essenceQuantity is not equal zero right after I call the public void changeQuantity method. Which is weird because I set value of essenceQuantity to zero in void Awake().

Is it possible that variable value is saved between Play Modes without me knowing?

2 Replies

TL;DR: This component was part of a prefab asset and not a scene gameObject so it's fields never resets.

Your answer

Welcome to Unity Answers

Follow this Question

Related Questions