Error when accessing variables from another script: NullReferenceException: Object Reference not set to an instance of an object..

Questions & Answers
1

Hello people. I have 2 variables in my Flashlight script (which is located on a spotlight on the maincamera): batteryLife and maxBatteryLife. I wanted a reload type of thingy because the flashlight shuts off when batteryLife <= 0.

So i made a new script (located on the first person controller) and tried calling the two variables from Flashlight, but i get this Error: NullReferenceException: Object Reference not set to an instance of an object PickUpBatteries.ReloadCamera()

#pragma strict

function Update ()
{
	if (Input.GetKeyDown("r"))
	{
		ReloadCamera();
	}
}

function ReloadCamera ()
{
	GetComponent(Flashlight).batteryLife = GetComponent(Flashlight).maxBatteryLife;
}

Can you guys help me tweak it and thell me what im doing wrong?

2

Your code is assuming that the ‘Flashlight’ component is on the same game object as the above script, but from your description it is not. The typical solution:

#pragma strict

private var fl : Flashlight;

function Start()
{
	fl = GameObject.Find("Name of Flashlight Object").GetComponent(Flashlight);
}

function Update ()
{
    if (Input.GetKeyDown("r"))
    {
        ReloadCamera();
    }
}
 
function ReloadCamera ()
{
    fl.batteryLife = fl.maxBatteryLife;
}

See these links for further information on how to use GetComponent():

http://docs.unity3d.com/412/Documentation/ScriptReference/index.Accessing_Other_Game_Objects.html

http://unitygems.com/script-interaction-tutorial-getcomponent-unityscript/