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Question by Le-Capitaine · May 25, 2014 at 08:21 PM · c#nullreferenceexception

Can't explain an NRE

Using code I've already written for a menu system...

     public void MakeSubmenuOf(string[] menuToMake, string[] niceNames, GameObject parent, int number,
                               int fontSize, float x, float y, float offsetBetween) {
         GameObject subMenuToMake = parent;
         for (int i = 0; i < menuToMake.Length; i++) {
             menuText[number,i] = new GameObject(menuToMake[i]);
             menuText[number,i].transform.position = new Vector3(x,y - (i * offsetBetween), 0);
             menuText[number,i].transform.parent = subMenuToMake.transform;
             menuText[number,i].AddComponent<GUIText>();
                 
             menuText[number,i].guiText.text = niceNames[i];
             menuText[number,i].guiText.alignment = TextAlignment.Center;
             menuText[number,i].guiText.anchor = TextAnchor.MiddleCenter;
             menuText[number,i].guiText.fontSize = fontSize;
         }
         subMenus [number] = new GameObject[menuToMake.Length];
     }

...I'm trying to make a submenu from a different script...

 public class PauseMenu : MonoBehaviour {
 
     WholeGame game;
     Menu menuScript;
 
     public string[] options;
     public string[] optionNames;
     
     public List<GameObject> menus;
     GameObject[][] subMenus;
 
     GameObject[,] menuText;
     int menu = 0;
     
     int holdCounter;
     float oneFrameAgo;
     GameObject cursor;
     int[] selected;
 
     void Awake () {
         menuText = new GameObject[100,100];
         subMenus = new GameObject[100][]; // these two are just here 'cause they needed to be declared
 
         game = transform.parent.GetComponent<WholeGame> ();
         menuScript = GameObject.Find ("Menu Controller").GetComponent<Menu>();
 
         menuScript.MakeSubmenuOf (options, optionNames, this.gameObject, 0, 30, 0.5f, 0.5f, 0.1f);
     }

...but all I'm getting out of it is a NRE telling me that a null value was found where an object instance was required, specifically at this line.

 menuText[number,i] = new GameObject(menuToMake[i]);

It functions when I copy the code to the other script, but I wouldn't want to bloat my files with copies of the same code; would somebody manage to explain what gives?

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avatar image robertbu · May 25, 2014 at 08:38 PM 0
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One way for this error would be if 'menuTo$$anonymous$$ake[i]' is null. We don't see the initialization of array pass as menuTo$$anonymous$$ake, so I cannot verify.

avatar image Le-Capitaine · May 25, 2014 at 08:52 PM 0
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As I've got it, menuTo$$anonymous$$ake[i] should be options[i], the elements of which have been properly defined in the inspector. The line that refers to it is at the bottom of the second block of code:

      menuScript.$$anonymous$$akeSubmenuOf (options, optionNames, this.gameObject, 0, 30, 0.5f, 0.5f, 0.1f);

The for loop is made to stop exactly at the length of menuTo$$anonymous$$ake, so it couldn't be an out-of-range index.

avatar image supernat · May 26, 2014 at 05:21 AM 0
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I see you initializing menuText in the Pause$$anonymous$$enu script, but am I reading correctly that you moved the code ($$anonymous$$akeSubmenuOf()...) to a different file? Did you also make a local copy of menuText there and initialize it?

avatar image Le-Capitaine · Jun 02, 2014 at 08:38 AM 0
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I eventually had to copy $$anonymous$$akeSubmenuOf() anyway for other reasons, but thanks for the help.

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