Accessing variables in a structure in a class from another class with cSharp

Question

I have a class called Bullet which contains a struct of bullet. How do I access variables contained in this structure, from another class using cSharp?

 public class Bullet : MonoBehaviour
 {
     struct bullet
     {   
             private float _shootForce;
             public float shootForce    // The force at which missiles travel 
             {
                 get{return _shootForce;}
                 set{_shootForce = value;}
             }
     }
 }

Answer 1

Best Answer

Answer by maggot · Dec 12, 2011 at 04:36 PM

It was a struct called Bullet before, but I wanted to put it into a class, so I named the class Bullet and the struct bullet. I got it working now - and renamed some code. What I was missing was an instance of struct bullet(old name) in the Bullet class.

  public class Bullet
  {
     public struct bulletData
     {
          private float _shootForce;
          public float shootForce    // The force at which missiles travel 
          {
              get{return _shootForce};
              set{_shootForce = value};
          }
     }
     public bulletData playerBullet;
 }

Then in another class I invoke the Bullet class with :

     Bullet B = new Bullet();

I can then access the bulletData structure by code like :

 B.playerBullet.shootForce = 2f;

and

 float shootForce = B.playerBullet.shootForce;

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Bunny83 · Dec 12, 2011 at 04:50 PM 0

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Shouldn't you have your "playerBullet" variable declared somewhere in your Bullet class? ;)

maggot · Dec 12, 2011 at 05:21 PM 0

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whoops! Added public bulletData playerBullet; to the public class Bullet code above

Answer 2

Answer by jheiling · Dec 12, 2011 at 04:01 PM

You have a struct called bullet, but no instance of that struct. But what are you trying to achieve by having a class called "Bullet" containing a struct called "bullet"? That's just wrong!

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Answer 3

Like jheiling said: You don't have an instance of your struct, only a definition. A definition is just some kind of a "blueprint". It doesn't contain any data. You have to create an instance of that struct. It's the same for classes. A class definition just tells the compiler how an instance of this class looks like. In Unity by dragging a class onto a GameObject you create an instance of this class. If you want the class instance have an instance of your struct, you should create one and store it in a variable. Something like that:

 public class Bullet : MonoBehaviour
 {
     private struct bullet
     {   
         private float _shootForce;
         public float shootForce // The force at which missiles travel 
         {
            get { return _shootForce; }
            set { _shootForce = value; }
         }
     }
     private bullet _bulletData;
     private void Awake()
     {
          _bulletData = new bullet();
     }
     private void Update()
     {
         // do something with _bulletData
     }
 }

Some further notes:

Your struct is defined as private (private is the default visibility in C#) so you can't use the type outside of your class.
If you define your struct as public you can use the struct anywhere by the full type-path. This declares a variable with the type of your struct: private Bullet.bullet myVariable;
Type names and method names should ALWAYS start with a capital letter. Variable names should always start lower-case. Usually properties also starts with a capital letter but some people treat them like variables.
You should also think about why you want to seperate some data / functions in a seperate struct and find a proper name for it. A struct "bullet" in a class "Bullet" really makes no sense. If the struct is responsible for a specific aspect of your class, find a proper name.

Accessing variables in a structure in a class from another class with cSharp

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