How to call a function from another script - getting error Object reference not

Unity Engine
1

hi all
i have 2 script

1.MoneySystem.js

#pragma strict
static var money : int = 0 ; // for money systemfunction


function Update() {

}

function AddMoney()
{
	money = money + 20 ;
	Debug.Log(money);

}

and

2.CharacterDamage.js

var hitPoints = 100.0;
var deadReplacement : Transform;
var dieSound : AudioClip;
var moneySystem : MoneySystem ; // for money system
function ApplyDamage (damage : float) {
	// We already have less than 0 hitpoints, maybe we got killed already?
	if (hitPoints <= 0.0)
	{
		return;
	}

	hitPoints -= damage;
	//expand enemy search radius if attacked outside default search radius to defend against sniping
	transform.GetComponent(AI).attackRangeAmt = transform.GetComponent(AI).attackRange * 3;
	
	if (hitPoints <= 0.0)
	{
		Detonate();
		//money system
		moneySystem = this.gameObject.GetComponent(MoneySystem);
		moneySystem.AddMoney();
	}
}

function Detonate () {
	// Destroy ourselves
	Destroy(gameObject);

	// Play a dying audio clip
	if (dieSound)
		AudioSource.PlayClipAtPoint(dieSound, transform.position);

	// Replace ourselves with the dead body
	if (deadReplacement) {
		var dead : Transform = Instantiate(deadReplacement, transform.position, transform.rotation);
		
		// Copy position  rotation from the old hierarchy into the dead replacement
		CopyTransformsRecurse(transform, dead);
	}
}

static function CopyTransformsRecurse (src : Transform,  dst : Transform) {
	dst.position = src.position;
	dst.rotation = src.rotation;
	
	for (var child : Transform in dst) {
		// Match the transform with the same name
		var curSrc = src.Find(child.name);
		if (curSrc)
			CopyTransformsRecurse(curSrc, child);
	}
}

but dont work and give a error :
NullReferenceException: Object reference not set to an instance of an object

how can fix it ?!

2

Have you added the MoneySystem script to the gameObject?

3

Select the gameobject that holds the CharacterDamage, and drag the gameobject that holds the moneysystem in the “MoneySystem” field

4

yes , "MoneySystem"attached to player

I do not understand what you mean

5

Who can help me?

6

http://unity3d.com/learn/tutorials/modules/beginner/editor/the-inspector

7

i want do it with code

MoneySystem.js attached to player
and
CharacterDamage.js attached to enemy

in CharacterDamage.js
i create a varibale
var moneySystem : MoneySystem ; // for money system

and with code i try to access to AddMoney Function

//money system

moneySystem = this.gameObject.GetComponent(MoneySystem);

moneySystem.AddMoney();

but dont work :frowning:

8

i change code to this :

var hitPoints = 100.0;
var deadReplacement : Transform;
var dieSound : AudioClip;
//var moneySystem : GameObject ; // for money system
function ApplyDamage (damage : float) {
	// We already have less than 0 hitpoints, maybe we got killed already?
	if (hitPoints <= 0.0)
	{
		return;
	}

	hitPoints -= damage;
	//expand enemy search radius if attacked outside default search radius to defend against sniping
	transform.GetComponent(AI).attackRangeAmt = transform.GetComponent(AI).attackRange * 3;
	
	if (hitPoints <= 0.0)
	{
		Detonate();
		//money system
		var ms : MoneySystem;
		ms = "Player".GetComponent("MoneySystem");
		ms.AddMoney();
	}
}

but …
new error has :
MissingMethodException: Method not found: ‘System.String.GetComponent’.

9

i can fix it by this code

		ms = GameObject.Find("Player").GetComponent(MoneySystem);

and also u can 1 line code replaced for all of code in CharacterDamage

 GameObject.Find("Player").GetComponent(MoneySystem).AddMoney();

:smile:
tan Q all :x:grin: