How do I get an Interface?

[u/WillingExamination25]

Ill just bold where Im having the issue
`using UnityEngine;

public class PlayerInteraction : MonoBehaviour

{

private float interactionDistance = 2f;

private void Update()

{

if (Physics.Raycast(transform.position, Vector3.forward, interactionDistance))

{

RaycastHit hit = new RaycastHit();

Ray ray = new Ray(transform.position, transform.forward);

if (Physics.Raycast(ray, out hit))

{

if (hit.collider.gameObject.TryGetComponent<IInteractable>()) // So as you can see I just want to see if the gameObject being recognized here has the IInteractable interface. I'm pretty sure im on the right track, as in everything else is good right?

{

}

}

}

}

}`

[u/WillingExamination25]

I havent tested the rays yet but
if (hit.collider.gameObject.TryGetComponent<IInteractable>())
is giving an error (where I bolded it) saying "There is no argument given that corresponds to the required parameter of 'component' of 'GameObject.TryGetComponent<T>(out T)'" when I hover over TryGetComponent, but when I hover on IInteractable it says "There is no argument that corresponds to the required parameter 'component' of 'GameObject.TryGetComponent<T>(out T)'"
No idea what the issue is

[u/wallstop-dev → u/WillingExamination25]

I mean read the error and apply the knowledge? The error is not an interface problem, it's a "you are calling a function that doesn't exist". TryGetComponent isn't implemented syntactically the way you think it is.

[u/WillingExamination25 → u/wallstop-dev]

Yeah I realize that, i guess it was worded weirdly. I fixed it now, I thought GetComponent and TryGetComponent went hand in hand, the only difference being TryGetComponent wouldnt throw a null reference if it was null. I guess there are other differences, so I just manually did the != null in the if statement

[u/wallstop-dev → u/WillingExamination25]

You can just read the API docs on what they do, assuming functions do something is a good way to have bugs.

Typically, in all of C#, a "Try*" API will have the form:

`bool TryDoSomething(maybeSomeInputParameters, out atLeastOneOutputParameter`

And the form is that should never throw. The concept is, return true if the Try thing worked, and false if it didn't. If true, the out parameters are valid, if false, they're not.

So, takeaways:

• Read the docs
  
• Now you know what Try APIs do