Get variable from other GameObject's script

Archived Forums Questions & Answers
1

I tried to get the variable nbullet from the script Control of the GameObject Player, I wrote this script:

using UnityEngine;
using System.Collections;

public class Info : MonoBehaviour {

public int nbullet;
public GameObject player;
void Start () {
}
void Update () {
    player = GameObject.Find("Player");
    nbullet = GetComponent("Control").nbullet;
    }
}

but it tells me this error:

Assets/Info.cs(29,52): error CS1061: Type UnityEngine.Component’ does not contain a definition for nbullet’ and no extension method nbullet’ of typeUnityEngine.Component’ could be found (are you missing a using directive or an assembly reference?)

why? how can I fix this?

I've spotted the issue. Everything is correct except for line 12. You wrote nbullet = GetComponent("Control").nbullet. This is almost correct. You forgot to GetComponent from the player, and I think the GetComponent could potentially have incorrect syntax. So it should be more like this: nbullet = player.GetComponent<Control>().nbullet;

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3 Answers

3
2

If the nbullet variable is public you just have to cast the Component to the script like this:

var controlscript : Control = player.GetComponent("Control");
nbullet = controlscript.nbullet; //You should also consider renaming your nbullet variable

what kind of variable is Control? I can't use it.

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Nvm you're using C#. Control is the script so the variable type is called Control. In your case it would be: Control controlscript = player.GetComponent<Control>(); If you want to read about how to access variable from other scripts follow this link: http://docs.unity3d.com/Documentation/ScriptReference/index.Accessing_Other_Game_Objects.html

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thx,now it run but it stop telling: NullReferenceException UnityEngine.GameObject.GetComponent[Control] () (at C:/BuildAgent/work/6bc5f79e0a4296d6/Runtime/ExportGenerated/Editor/BaseClass.cs:180) Setting.Update () (at Assets/Setting.cs:40) what's a NullReferenceException ?

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A NullReferenceException occurs when you reference something in your script which doesn't exist. In this case maybe there is no Control script attached when you're using getComponent.

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Thx I found the error, I was searching the GameObject Player but instantiating the Player it was named Player(Clone). Thank you really much

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4

I’ve spotted the issue. Everything is correct except for line 12. You wrote nbullet = GetComponent("Control").nbullet. This is almost correct. You forgot to GetComponent from the player, and I think the GetComponent could potentially have incorrect syntax. So it should be more like this: nbullet = player.GetComponent<Control>().nbullet;

3

You should learn how to use this site. This has many answers all over the place.

Also look there: unitygems.com - unitygems Resources and Information.
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