no access to script, although getComponent?

hi there
i have some problems with my script. in one class i have this code:

Code (CSharp):

1. //kabel getroffen
2.                         previewCable = Instantiate(cable1, dock2, new Quaternion(0,0,0,0)) as GameObject;
3.                         //kabel miteinander verbinden
4.  
5.                         hit.transform.gameObject.GetComponent<Cable>().connect(previewCable);//WORKS!!!
6.                    
7.                         previewCable.GetComponentInChildren<Cable>().connect(hit.collider.gameObject); //PROBLEM!!!!
8.  
9.  

and in the other class this:

Code (CSharp):

1.     public List<GameObject> connections;
2.  
3. .......
4.  
5.     public void connect(GameObject otherCable){
6.         connections.Add (otherCable);
7.     }

my problem is, that if i want to access the "cable" component of the previewCable Gameobject, i don't have any access to the Cable script on the previewCable object. i CAN disable and enable the script via getComponent but nothing more. funny enough the line above works without any problems, where i want to access the script of the hitted object.

 

Do you get an error message? If it's a null reference exception try debuging it.

Code (CSharp):

1.  
2. previewCable = Instantiate(cable1, dock2, new Quaternion(0,0,0,0)) as GameObject;
3.                         hit.transform.gameObject.GetComponent<Cable>().connect(previewCable);//WORKS!!!
4.  
5. if( previewCable.GetComponentInChildren< Cable >() != null ){
6. Debug.Log( "Cable found in Child of previewCable!" );
7.  
8. previewCable.GetComponentInChildren<Cable>().connect(hit.collider.gameObject); //PROBLEM!!!!
9. }
10. else if( previewCable.GetComponent< Cable >() != null ) {
11. Debug.Log( "Cable found on previewCable!" );
12.  
13. previewCable.GetComponent< Cable >().connect( hit.collider.gameObject );
14. }
15. else {
16. Debug.Log( "Cable could not be found!" );
17. }
18.  

It will be easy to see if it can be found at all.

 

no i don't get an error message. the reference to the gameobjects are also not null. i don't get why i can't access the script

when i run this debugging code it says: "Cable found in child of previewCable!". so it finds the cable script, but if i want to access it's values, nothing happens

 

some additional info. i CAN read from the script, but can't write to it. but when i read it i get always 0. like i get the values. before they are not initialized.

 

:\ hm, sound as if the problem is in the code somewhere. Could you post the code so we can read through it?

 

sure this is it.

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3.  
4. public class placeCable : MonoBehaviour {
5.  
6.     BuildControl buildControlScript;
7.     public GameObject cable1;
8.     GameObject previewCable;
9.     bool cableSpawned;
10.     RaycastHit hit;
11.     public float mouseSensitivity;
12.     PlayerController playerControllerScript;
13.     CameraYMove cameraYMoveScript;
14.  
15.  
16.     // Use this for initialization
17.     void Start () {
18.         //load references
19.         buildControlScript = GetComponent<BuildControl> ();
20.         playerControllerScript = GetComponent<PlayerController> ();
21.         cameraYMoveScript = GetComponentInChildren<CameraYMove> ();
22.         //set cable spawned to false cause no cable spawned yet
23.         cableSpawned = false;
24.         //sensitivity for cable alignment
25.         mouseSensitivity = 50f;
26.  
27.     }
28.  
29.  
30.     void alignCable(){
31.         //disable camera movement while cable placement
32.         playerControllerScript.enabled = false;
33.         cameraYMoveScript.enabled = false;
34.         previewCable.transform.Rotate(Input.GetAxis("Mouse X") * mouseSensitivity, 0, Input.GetAxis("Mouse Y") * mouseSensitivity);
35.  
36.     }
37.  
38.  
39.     // Update is called once per frame
40.     void Update () {
41.    
42.         //right mouse click...
43.         if (Input.GetMouseButtonDown(1) && !cableSpawned) {
44.             //check a bool if a cable should be build
45.             if(buildControlScript.buildCable){
46.                 //send ray from mouse position
47.                 Ray ray= Camera.main.ScreenPointToRay (Input.mousePosition);
48.                 //if raycast hit...check hitted object
49.  
50.                 if(Physics.Raycast(ray, out hit)){
51.                     /chec if another cable was hit
52.                     if(hit.transform.tag == "Elec"){
53.                         //calculate docking points
54.                         Vector3 dock1 = hit.transform.parent.position;
55.                         Vector3 dock2 = hit.transform.parent.Find("KabelDock2").position;
56.  
57.                         //cable hit
58.                         previewCable = Instantiate(cable1, dock2, new Quaternion(0,0,0,0)) as GameObject;
59.                         //connect cables
60.                         Cable cableScript = previewCable.GetComponentInChildren<Cable>();
61.                         cableScript.connect(hit.transform.gameObject);
62.                         Debug.Log(cableScript.connections.Count);
63.                         hit.transform.gameObject.GetComponent<Cable>().connect(previewCable.GetComponentInChildren<Cable>().gameObject);
64.                    
65.                         //cable spawned! set boolean
66. to true to align cable
67.                         cableSpawned = true;
68.  
69.                     }else{
70.                         //no cable was hit
71.  
72.                         //spawn cable
73.                         previewCable = Instantiate(cable1, hit.point,new Quaternion(0,0,0,0)) as GameObject;
74.                         //align cable to object
75.                         previewCable.transform.rotation = Quaternion.FromToRotation(Vector3.back, hit.normal);
76.                         //align cable
77.                         previewCable.transform.Translate(hit.normal * previewCable.transform.localScale.z);
78.                         previewCable.transform.parent = hit.transform;
79.                         cableSpawned = true;
80.  
81.                     }
82.                 }
83.  
84.             }
85.         /left moused
86.         }else if(Input.GetMouseButton(1) && cableSpawned){
87.            
88.             alignCable();
89.  
90.         //mouse released! activate camera movement again
91.         }else if(Input.GetMouseButtonUp(1)){
92.        
93.             cableSpawned = false;
94.             playerControllerScript.enabled = true;
95.             cameraYMoveScript.enabled = true;
96.             //set parent
97.             //previewCable.transform.parent = hit.collider.transform;
98.  
99.         //delete cable
100.         }else if(Input.GetMouseButtonDown(0)){
101.  
102.             Ray ray= Camera.main.ScreenPointToRay (Input.mousePosition);
103.            
104.             if(Physics.Raycast(ray, out hit)){
105.                 //wenn ein kabel getroffen wurde
106.                 if(hit.collider.tag == "Elec"){
107.            
108.                         GameObject.Destroy(hit.transform.parent.gameObject);
109.                 }
110.             }
111.  
112.         }
113.     }
114. }
115.  

 

and the cable class

Code (CSharp):

1.  
2. using UnityEngine;
3. using System.Collections;
4. using System.Collections.Generic;
5.  
6. public class Cable : MonoBehaviour {
7.  
8.     //trigger
9.     public bool marker;
10.     //current ampere
11.     public float ampere;
12.     //list for connected cables
13.     public List<GameObject> connections;
14.     //additional ampere
15.     public float colliderAmpere;
16.  
17.  
18.  
19.     // Use this for initialization
20.     void Start () {
21.         ampere = 0f;
22.         colliderAmpere = 0f;
23.         marker = false;
24.         connections = new List<GameObject>();
25.  
26.     }
27.  
28.  
29.     //set ampere
30.     public void setAmp(float value){
31.        
32.         ampere += value + colliderAmpere;
33.         //conduct ampere
34.         conduct (ampere);
35.         marker = !marker;
36.     }
37.    
38.     //conduct ampere to connected cables
39.     void conduct(float value){
40.         float partAmpere = ampere / connections.Count;
41.        
42.         Debug.Log (connections.Count);
43.         foreach (GameObject otherCable in connections) {
44.             //check if cables was updated already
45.             if(otherCable.GetComponent<Cable>().marker != marker)
46.                 otherCable.GetComponent<Cable>().setAmp(partAmpere);
47.         }
48.     }
49.  
50.  
51.     public void connect(GameObject otherCable){
52.         connections.Add (otherCable);
53.     }
54.  
55.  
56.    
57.  
58. }

 

i don't get it

could it be that the values i send to the cable object get there BEFORE the start function. and then the start function goes over it and deletes the values i send to the object?

 

I found the bug like i said, in the cable class in the start method, i overwrote the list (connections = new list<gameobject>()) .