[C#] get an object in the scene

Hello everyones !

I'm working in a scene where there is a camera, a light and a canvas. The camera instanciate some cube in order to create a map when i launch the scene. The problem is : i want to acces to the canvas and be able to modify it in the script i put on my instantiated cube.
So far i'm using FindObjectOfType like this :

Code (CSharp):

1.         Infos = new Text[8];
2.  
3.         ProtoUI = (Canvas) FindObjectOfType (typeof(Canvas));
4.         Infos = ProtoUI.GetComponents <Text> ();
5.         print (Infos.Length);

But there is not the result i want because when i print the size of Infos[] it says that it is 0...
How can i get the content of my canvas properly ?

 

You could try: GameObject.Find("Canvas").GetComponent<Transform>().FindChild("YOUR ELEMENT").GetComponent<Text>();
Or simply adding a serialized field in your script and drag and drop your element in the inspector.

[SerializedField] Text myText;

 

GetComponentsInChildren is your friend as GetComponents does only search on the current object.

@panicq Too many string evaluations - not safe for refactoring and performance sensitive.

 

@Glockenbeat good to know

 

Yeah, this is going to collapse into a steaming mess the moment you add a second canvas to the scene. And there are plenty of reasons to add a second canvas to the scene. While GameObject.Find has a bad rap, I'd suggest using it over relying on FindObjectOfType.

The other alternative is to use FindObjectsOfType and iterate over the results.

 

Thanx to the quick response guys !
I'm a bit lost with theses functions, i have search how to use them but i can't do what i want with them, maybe i don't use them properly ...

The FindObjectOfType code :

Code (CSharp):

1.         Infos = new Text[8];
2.  
3.         ProtoUI = FindObjectOfType <Canvas>();
4.         Infos = ProtoUI.GetComponents <Text> ();
5.         print (Infos.Length);
6.         Infos[0].text = posX + " / " + posY;

And the ComponentInChildren code :

Code (CSharp):

1.         Infos = new Text[8];
2.  
3.         ProtoUI = GetComponentInChildren <Canvas>();
4.         Infos = ProtoUI.GetComponents <Text> ();
5.         print (Infos.Length);
6.         Infos [0].text = posX + " / " + posY;

In both case i got an error saying that Infos is empty .

 

Maybe if i post all my script it might be useful to understand.

Code (CSharp):

1. sing UnityEngine;
2. using UnityEngine.UI;
3. using System.Collections;
4.  
5. public class CubeContent : MonoBehaviour {
6.  
7.     public    GameObject            Ore;
8.  
9.     private    Canvas                ProtoUI;
10.     private    Text[]                Infos;
11.  
12.     private GameObject            ContentOre;
13.     public    int                    posX;
14.     public    int                    posY;
15.     public    int                    EggContent;
16.     public    NinjaController[]    Ninjas;
17.  
18.     // Use this for initialization
19.     void Start () {
20.         EggContent = 0;
21.         Ninjas = null;
22.     }
23.    
24.     // Update is called once per frame
25.     void Update () {
26.         //appel des fonctions réseau.
27.     }
28.     void OnMouseDown(){
29.         print ("I've been clicked");
30.         Infos = new Text[8];
31.  
32.         ProtoUI = GetComponentInChildren <Can>();
33.         Infos = ProtoUI.GetComponents <Text> ();
34.         print (Infos.Length);
35.         Infos [0].text = posX + " / " + posY;
36.     }
37.  
38.     public void    CreateOre(){
39.         int[] ValOre;
40.         ContentOre = (GameObject)Instantiate (Ore, new Vector3 (0, 0, 0), transform.rotation);
41.  
42.         ValOre = new int[7];
43.         ValOre [0] = 1;
44.         ValOre [1] = 1;
45.         ValOre [2] = 1;
46.         ValOre [3] = 1;
47.         ValOre [4] = 1;
48.         ValOre [5] = 1;
49.         ValOre [6] = 1;
50.  
51.         ContentOre.GetComponent<OreData>().setCoordinates (posX, 0, posY);
52.         ContentOre.GetComponent<OreData>().setOreAmount (ValOre);
53.         ContentOre.GetComponent<OreData>().setDisplayed ();
54.     }
55.  
56.     public    void    setPos(int x, int y){
57.         posX = x;
58.         posY = y;
59.         CreateOre ();
60. //        Instantiate (Cube, new Vector3 (x, 0, y), transform.rotation);
61.     }
62.  
63.     public    void    setEggValue(int Amount){
64.         EggContent += Amount;
65.         if (EggContent > 99)
66.             EggContent = 99;
67.         else
68.             EggContent = 0;
69.     }
70.  
71.     public    int    getposX(){
72.         return (posX);
73.     }
74.  
75.     public    int    getposY(){
76.         return (posY);
77.     }
78.  
79.     public    int    getEggVal(){
80.         return (EggContent);
81.     }
82.  
83.     public    int    getNinjaValue(int Number){
84.         if (Ninjas [Number])
85.             return (Ninjas [Number].getStatus());
86.         return (-1);
87.     }
88. }

 

Code (CSharp):

1.     ProtoUI = FindObjectOfType<Canvas>();
2.     Infos = ProtoUI.GetComponentsInChildren <Text> ();
3.     print (Infos.Length);

 

Wow thanks ! It works !