SendMessage has no receiver

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Hello.

I'm having some troubles with the SendMessage method. This is the situation:

My player tries to shoot a bouncing ball, and when the harpoon hits the ball, it is supposed to disappear (yep, it is some kind of Pang clone...). Now, the code.

 public class ShootController : MonoBehaviour {
 
     // Player shoots
     public Transform shootPosition;
     public GameObject shoot;
     private bool chainFired = false;
     private GameObject chainSprite;
 
     void Update () {
     
         if (chainFired) {
 
             chainSprite.transform.localScale += new Vector3 (0, 0.4f, 0);
             chainSprite.transform.position += new Vector3 (0, 0.2f, 0);
         }
     }
 
     void Shoot () {
 
         if (chainFired) {
 
             Destroyer (chainSprite);
         }
         chainSprite = Instantiate (shoot, shootPosition.position, shootPosition.rotation) as GameObject;
         chainSprite.name = shoot.name;
         chainFired = true;
     }
 
     void Destroyer (GameObject gameObject) {
 
         if (gameObject.tag == "Shoot") {
 
             chainFired = false;
         }
 
         Destroy (gameObject);
     }
 }

Inside the BalloonController:

 void OnTriggerEnter2D (Collider2D other) {
 
         if (other.gameObject.tag == "Shoot") {
 
             shootController.SendMessage ("Destroyer", other.gameObject);
             Destroy (this.gameObject);
         }
     }

And here there a couple of screenshots from the inspector:

alt text

What I'm doing wrong? Maybe that Shoot prefab shouldn't be assigned to the Shoot param in ShootController script? I've read around here that prefabs don't work with SendMessage, but I'm still missing an alternative.

Thanks for your help!

Answer 1

Best Answer

Answer by GameVortex · Jun 08, 2017 at 07:00 PM

The "Destroyer" function takes a GameObject as a parameter and you are providing it with the object "other" which is a Collider2D. This makes the system look for a Destroyer function which takes a Collider2D as a parameter, which is a function that does not exist causing the No Reciever error. You should provide it with the GameObject you are using to compare the tag: "other.gameObject".

That being said I am wondering why you need to use SendMessage? You do seem to have a direct reference to the ShootController. You could easily make the Destroyer function public and call it directly:

shootController.Destroyer(other.gameObject);

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MorbidDesign · Jun 11, 2017 at 04:38 PM 0

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Sorry, @GameVortex, but after some tweaking I left the wrong code. What I really have written down was other.gameObject, as you suggest. But it doesn't work.

What I found out is that if I put all the objects that I want to instantiate in some location out of camera, the reference to the shootController script is never lost, so I can use Send$$anonymous$$essage without problem.

The main reason why I need to do this is to change the value of a bool variable inside shootController, in case that the object to destroy is a "shoot".

GameVortex MorbidDesign · Jun 11, 2017 at 05:59 PM 0

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Then I am not quite sure what your exact issue is, as you are saying you can use the Send$$anonymous$$essage without problem? Are you getting any error messages? If so then please copy the whole message including the line number. Perhaps describing the problem with a few more details.

Also I did not question why you needed to call the function Destroyer, I was wondering why you needed to use Send$$anonymous$$essage to do so ins$$anonymous$$d of making the Destroyer function public and calling it directly as in my example above.

MorbidDesign · Jul 09, 2017 at 05:18 PM 0

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Thanks @GameVortex, I was a little bit obfuscated. You're right, Send$$anonymous$$essage was not neccesary and by making my function public the problem is over.

SendMessage has no receiver

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