koobas.hobune.stream
Need Help With a NullReference Exception
Ok, I am following the unity 3D tutorials from the official website, however I coding my own stuff as I go rather than just copying the code from the videos. The ideas is the following. I have a script where I hold data as ammo, bombs and so on. I have a spaceship shooting perfectly, but I want the ammo to decrease so I am using GetComponent to access the script holding the data and therefore be able to decrease it, however when I am going to test the code, I get a nullreferenceexception and I can't figure out what it is.
using UnityEngine;
using System.Collections;
public class Shooting : MonoBehaviour
{
public GameObject laserPrefab;
public Transform guns;
private Inventory inventory;
//private float laserSpeed = 50;
// Use this for initialization
void Awake()
{
inventory = GetComponent<Inventory>();
}
void Start()
{
}
// Update is called once per frame
void Update ()
{
shoot();
}
void shoot()
{
if(Input.GetKeyDown(KeyCode.Space))
{
Instantiate(laserPrefab, guns.position, guns.rotation);
inventory.ammo.bullets--; //This is the problem
Debug.Log(inventory.ammo.bullets);
}
}
}
Any help will be appreciated, thank you very much for your time!
Is the Inventory script attached on the same gameobject this script is ? If yes, show us inventory script.
And it's actually better to have function that removes bullets on inventory itself, instead of tweaking it from others script.
inventory.RemoveBullets();
But in Inventory script create function
public void RemoveBullets(){
ammo.bullets--;
}
Well. the Inventory script is attached to the parent game object. That is, I have a spaceship model with the Inventory attached to it. Then I created a child object inside the ship which are the gun points and I attached the shooting script to them. I like to be a clear as possible so don't mind me doing a little diagram.
ShipGameObject.
Components
-Moving_Script -->which works perfectly
-Inventory_Script
Child_Object_Guns
Components
-Shooting_Script
I will show you the inventory script anyway and I will try your suggestion in the meantime. Thank You!
using UnityEngine;
using System.Collections;
public class Inventory : MonoBehaviour
{
public class Ammo
{
public int bullets;
public int missiles;
public int bombs;
public int health;
public Ammo(int bull, int mss, int bmb, int hp)
{
bullets = bull;
missiles = mss;
bombs = bmb;
health = hp;
}
}
public Ammo ammo = new Ammo(200, 50, 10, 200);
// Use this for initialization
void Start ()
{
}
// Update is called once per frame
void Update ()
{
}
}
I ended fixing it today. Here is what I did. using UnityEngine; using System.Collections;
public class Shooting : $$anonymous$$onoBehaviour
{
public GameObject laserPrefab;
public GameObject ship; //created ship game object
public Transform guns;
private Inventory inventory;
//private float laserSpeed = 50;
// Use this for initialization
void Awake()
{
inventory = ship.gameObject.GetComponent<Inventory>();//initialized inventory to the ship gameobject, so that I could access what I wanted.
}
void Start()
{
}
// Update is called once per frame
void Update ()
{
shoot();
}
void shoot()
{
if(Input.Get$$anonymous$$eyDown($$anonymous$$eyCode.Space))
{
Instantiate(laserPrefab, guns.position, guns.rotation);
inventory.bulletDecrement(); //works like a charm now
}
}
}
I have to thank young developer for the tip of having the decrement function on the actual inventory and calling it from there. Thanks for the help!
