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Question by Ermask · May 08, 2015 at 05:42 AM · objectvariableclasspublic

Modify a variable inside a game object from other object.

I´m totally new to C# and unity. I´m following this tutorial : https://unity3d.com/es/learn/tutorials/modules/beginner/live-training-archive/persistence-data-saving-loading. So basically i do this: A new scene, a new empty object(named "prueba") and add script to it:

using UnityEngine; using System.Collections;

public class prueba: Monobehaviour {

  public static prueba primera;
  public string variable1 = "sometext";

  void Start () {
 
  }

}

Then i do the same with a new object (named "otro") and it´s script:

using UnityEngine; using System.Collections;

public class otro : MonoBehaviour {

  void Start () {
       prueba.primera.variable1 = "adfadas"; //the program say that here is the error.
       Debug.Log (prueba.primera.variable1); 
  }

}

The error it shows is: "NullReferenceException: Object reference is not set to and instance of an object".

It sould be easy. I think i´m doing just like the tutorial what i´m missing?. Other tutorials went perfect but... I´ll be glad for any help. Thx a lot.

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Answer by JinJin · May 08, 2015 at 07:54 AM

You should use English names for your classes, functions and variables and use large initials for class and function names - if you do that, it will be easier for other people to help you ;)

To answer your question:

 public class prueba: Monobehaviour {
 
       public static prueba primera;
       public string variable1 = "sometext";
      
       void Start () {
          primera = this;
       }
 }

NullReferenceException means that primera was not initialized (it had no value) that means the reference was null.

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avatar image Ermask · May 08, 2015 at 08:37 AM 0
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Solved. Thx a lot man i´ve spent a lot of time searching info but everything was outdated. Seriously, thanks.

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