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Question by Frisk17 · Mar 01, 2019 at 09:14 AM · c#scripting problemnullreferenceexceptionscriptableobject

Static function not working in between screen

I'm coding my RPG battle system so for that I created a scriptable object called enemy.

I created a function battle to load my battle scene along with the enemy object:

 public static void Battle(Enemy enemy){
         SceneManager.LoadScene(1);
         GameObject.FindWithTag("Enemy").GetComponent<EnemyObject>().enemy = enemy;
 }

NOTE: I already made GameManager Don't destroy on load so that it remains on the scene. Now the scene is loading all right but I encountered a null reference exception.

I called Battle(toxopus); after a conservation of the character. My project is 2D but that's not a problem. The error says that there's no enemy object so I believe it does the finding before switching scenes. Any suggestions? alt text

screenshot-2019-03-01-at-24006-pm.png (61.9 kB)
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Answer by Frisk17 · Mar 02, 2019 at 07:43 AM

I FIXED that! I created 2 static variables static bool searching; static Enemy currentEnemy;

 public static void Battle(Enemy enemy)
     {
         if (enemy == null) { Debug.Log("Stop Battle!! Enemy is Null"); return; }
         SceneManager.LoadScene(1);
         currentEnemy = enemy;
         searching = true;
     }

Along with this I added some code to update. The answer by @sath was correct but due to some reason it didn't worked without update.

 private void Update()
     {
         if (Input.GetKeyDown(KeyCode.F4)) ChangeResolution();
         if(searching)
         {
             do
             {
                 Debug.Log("LOADING");
             } while (SceneManager.GetActiveScene().buildIndex != 1);
 
             GameObject.FindGameObjectWithTag("Enemy").GetComponent<EnemyObject>().enemy = currentEnemy;
             searching = false;
         }
     }

Thanks to everyone who tried helping.

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Answer by sath · Mar 01, 2019 at 02:33 PM

@Gamingdude1 Hi, try this (not tested)

 public static void Battle(Enemy enemy)
     {
         if (!enemy) { Debug.Log("Stop Battle!! Enemy is Null"); return; }
         SceneManager.LoadScene(1);
         FindEnemy(enemy);
     }
 
     static void FindEnemy(Enemy enemyCurrent)
     {
         GameObject enemyTarget = null;
 
         while (enemyTarget == null)
         {
             enemyTarget  = GameObject.FindWithTag("Enemy");
             //just in case
             if (enemyTarget) break;
         }
 
         EnemyObject enemyObject = enemyTarget.GetComponent<EnemyObject>();
 
         if (!enemyObject) { Debug.Log("EnemyObject not found!!"); return; }
 
         enemyObject.enemy = enemyCurrent;
 
         Debug.Log("Found Enemy!!");
         
     }






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avatar image Frisk17 · Mar 02, 2019 at 07:02 AM 0
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Well this SHOULD work but due to some reason my $$anonymous$$ac shows loading sign and application not responding. As I can't see any Debug logs I believe it's stuck in the scene load due to some reason or maybe be scene is loaded and not showing and it's stuck in the while loop.

avatar image Frisk17 · Mar 02, 2019 at 07:05 AM 0
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I tried commenting areas... it is because of the while loop... though I couldn't find the cause..

avatar image Frisk17 · Mar 02, 2019 at 07:08 AM 0
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Putting the while loop with just a debug log even crashes..

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