editable array length

Unity Engine
1

can anyone help?
i have a Array this bit

class DemoData
{
	 var name : String;
	 var id : int;
     var x : float;
     var y : float;
     var z : float;
	 var Rx : float;
     var Ry : float;
     var Rz : float;
	 var iChild = new ChildData[50]; 
}
class ChildData
{ 
	 var name : String;
	 var id : int;
     var x : float;
     var y : float;
     var z : float;
	 var Rx : float;
     var Ry : float;
     var Rz : float;
}


 class UserData
 {

   public var iUser = new DemoData[500];
}

and here happans the error

	for (g = 0 ; g < gameobjects.length; g++){
	  myData.iUser[g].name = gameobjects[g].name;
	  myData.iUser[g].id = gameobjects[g].GetInstanceID();
	  myData.iUser[g].x = gameobjects[g].transform.position.x;
      myData.iUser[g].y = gameobjects[g].transform.position.y;
      myData.iUser[g].z = gameobjects[g].transform.position.z;
	  myData.iUser[g].Rx = gameobjects[g].transform.rotation.x;
	  myData.iUser[g].Ry = gameobjects[g].transform.rotation.y;
	  myData.iUser[g].Rz = gameobjects[g].transform.rotation.z;
		for(e = 0 ; e <gameobjects[g].transform.childCount; e++) {
			  myData.iUser[g].iChild[e].name = gameobjects[g].transform.GetChild(e).name;
			  myData.iUser[g].iChild[e].id = gameobjects[g].transform.GetChild(e).GetInstanceID();
			  myData.iUser[g].iChild[e].x = gameobjects[g].transform.GetChild(e).localPosition.x;
			  myData.iUser[g].iChild[e].y = gameobjects[g].transform.GetChild(e).localPosition.y;
			  myData.iUser[g].iChild[e].z = gameobjects[g].transform.GetChild(e).localPosition.z;
			  myData.iUser[g].iChild[e].Rx = gameobjects[g].transform.GetChild(e).localRotation.x;
			  myData.iUser[g].iChild[e].Ry = gameobjects[g].transform.GetChild(e).localRotation.y;
			  myData.iUser[g].iChild[e].Rz = gameobjects[g].transform.GetChild(e).localRotation.z;
		}
	}

this is the error

NullReferenceException: Object reference not set to an instance of an object
NewBehaviourScript.OnGUI () (at Assets\NewBehaviourScript.js:112)

thanks for your help

demonicmetal cs

2

Looks like you’ve not initialised your myData.iUser variables, make sure you’ve called your constructor on it at the start of each iteration of your loop.

i.e.

for (g = 0; g < gameobjects.length; g++)
{
myData.iUser[g] = new DemoData();
myData.iUser[g].name = gameobjects[g].name;
...
3

thanks it works

an other question

public var iUser = new DemoData[500];

this makes a array of 500

is there a way to make it so there the lenght is changeble?

demonicmetal cs

4

I’m a C# developer rather than javascript, in C# there is a List that you can use in System.Generics. In your case you would type something like

Initialise the collection

public List<DemoData> iUser = new List<DemoData>;

Setup of the objects themselves

for (g = 0; g < gameobjects.length; g++) 
{ 
    DemoData demoData = new DemoData();
    demoData.name = gameobjects[g].name;
    ....
    ....
    myData.Add(demoData);
}
5

but how does it work in java??

becaus it says Add is not a member of iUser

6

What is myData ?

7

sorry i did not mension this

function Awake () { 
  
      // we need soemthing to store the information into
      myData=new UserData();
   }

ts is myData

8

I assume you mean javascript.

If you need resizable arrays, use javascript arrays or the ArrayList class.