Try to access variables of other script

Questions & Answers
1

LaneDetection LaneScript = GetComponent
In the above code LaneDetection is the script name
LaneScript is some random name.
I want to use the same script values in the other script. In the other script I have written the above code and trying to access the variables. But its giving errors. I did try of my own but could not get the answer. Can u tell me whats the error. If I write
if(LaneDetection.variablename == 1)
Error says :A field initializer cannot reference the nonstatic field, method, or property `UnityEngine.Component.GetComponent(System.Type)’

3

In C# if you want to access other variables in a script on the same GameObject you use

ScriptName exampleName =  gameObject.GetComponent<ScriptName>();
exampleName.variableName = newValue;

So for your LaneDetection script it’d be something like this:

LaneDetection laneScipt = gameObject.GetComponent<LaneDetection>();
laneScript.variableName = newValue;

There are other styles of doing this like:

LaneDetection laneScript = gameObject.GetComponent<LaneDetection>().variableName = newValue;

They do exactly the same thing. I prefer the first style more becuase then I can access multiple variables like so:

LaneDetection laneScript = gameObject.GetComponent<LaneDetection>();
laneScript.variable1 = newValue1();
laneScript.variable2 = newValue2();

In the script you’re referencing (in your case your LaneDetection script) you need to make sure the values are declared as public:

public type variableName;

Private variables don’t get found.

You can also call functions this way, replacing variableName with functionName. Referenced functions also need to be declared public.

If you’re looking for a way to call values and such from a GameObject that your scripts don’t share, GameObject.Find should be a good starting point:

LaneDetection laneScript = GameObject.Find("gameObjectName").GetComponent<LaneDetection>();
laneScript.variableName = newValue;
2

public static int variable; //This is decleration of variable in scriptA.

scriptA.variable = 1; //This is how to access it outside of scriptA.
4

There is a difference between a class and an object. A class is a type of an object but not a particular object. So to access object’s properties you need to have a reference to this object.

Try reading about Object-oriented programming, understand it’s basics and then look on Unity Scripting Lessons, they are awesome!

5

In order to keep things simple, assuming your LaneDetection class implementation: (pseudocode)

public class LaneDetection : MonoBehaviour    {
    public string publicIntanceVariable;
    static int myStaticVariable;
}

Now, Assume this script is attached to camera and another script is setting parameters:

LaneDetection LaneScript = Camera.main.GetComponent<LaneDetection> ();
LaneScript.publicIntanceVariable = yourStringValue; // Access variable through current instance
LaneDetection.myStaticVariable = youIntValue;       // Access variable by class name.

Notice the difference of LaneScript and LaneDetection in last two lines of code.

Hope it helps!

6

You can do this in this way also.

In your LaneDetection class declare variable like this:

public static LaneDetection Instance.

public int score;//for example

and assign Instance in awake like:

Awake(){
Instance = this;
}

Now you are ready to use this instance variable to get your public variable in other classes like this:

LaneDetection.Instance.score = 20;//or whatever value you want

Hope this will help you.