Accessing a list on other script

Question

I have this script:

    #pragma strict
     import System.Collections.Generic;
     DontDestroyOnLoad(gameObject);
     
     var myLifeTime : int = 0;
     public static var survival = new List.<String>();  
     
     function Awake()
     {
         var allGI = GameObject.FindGameObjectsWithTag("GameInfo");
         if(allGI.Length > 1)
         {
             for(theGI in allGI)
             {
                 if(theGI.GetComponent(GameInfo).myLifeTime > myLifeTime)
                 {
                     Destroy(gameObject);
                 }
             }
         }
     }
     
     function Start () {
         myLifeTime++;
     }

But i get this error: Static member `GameInfo.survival' cannot be accessed with an instance reference, qualify it with a type name instead

This is my other script:

 public GUIText scoretitle;
 public GUIText listText;
 GameObject gameInfo;
 private GameInfo other;
     
 void Start()
 {
     gameInfo = GameObject.FindWithTag ("GameInfo");
     other = gameInfo.GetComponent();
     scoretitle.guiText.enabled = true;
     listText.guiText.enabled = true;
     if(other.survival != null)
     {
         for (int i = 0; i <= other.survival.Count -1; i++)
         {
         listText.text += other.survival[i];
         listText.text += "/n";
         }
     }
 }

What is the problem and how can I fix it? :(

Thanks in advance!

Answer 1

Best Answer

Answer by Piflik · Jan 05, 2013 at 01:38 PM

Survival is a static variable. That means other.survival doesn't exist, because survival belongs to the class, not to its members. Not sure what your survival list is supposed to do, but you might want to consider making it not static, if you want a separate list for each member of the class.

You can access static variables with ScriptName.VariableName.

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Corandy · Jan 05, 2013 at 01:48 PM 0

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I have made survival list static because another script is adding objects to the list like:

var other = gameInfo.GetComponent(GameInfo); other.survival.Add(survival);

The reason why it goes first to the gameinfo.js and then to the Score script is because Gameinfo.js is a persistant data script and it needs to have that information so he can send it to the other script if I boot the game up.

I hope I have cleared a bit more up :O But how do I need to use ScriptName.VariableName? Thanks Again

Piflik · Jan 05, 2013 at 02:02 PM 0

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When you only need one single list and have it persistent, a static list is not a bad idea, I just thought to mention it, because many seem to treat the keyword static like an easy method to access variables/methods from other scripts...

Anyways, what you do to access your static list, is simply write 'GameInfo.survival' wherever you need access to that list. Unity will find the script and the variable inside it, even if you haven't assigned this script to any object in the scene.

You don't need a gameObject or the GameInfo component on that object, in fact, if you try to get access to that list that way, you will get the error you are encountering, because you try the non-static approach of accessing other scripts' variables with a static variable and that doesn't work. The component is a member of the class, and so it doesn't have a survival variable. This variable belongs to the class itself.

The method you are trying to use would work with non-static public variables.

Corandy · Jan 05, 2013 at 02:17 PM 0

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Oh many thanks, its working now.

You were right to mention it, because it was not clear why it had a static list and me months ago did overly used static in the wrong way so I understand your urge and importance to mention it.

With this problem now solved I know even more about statics and gives me hope for futher learning. Also the whole compenent thingy is more clearly now.

Thanks alot!

Sorry for bad english

Accessing a list on other script

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