The type or namespace name 'ICloudRecoEventHandler' could not be found

Question

EDITED

I changed my Unity version to 2018.3.8f1 and Vuforia version to 8.0.10 and it worked. But anyone knows how to work in the newest version?

I am following this tutorial to implement Cloud Reco in Unity.

Error in my SimpleCloudHandler.cs script:

error CS0246: The type or namespace name 'ICloudRecoEventHandler' could not be found (are you missing a using directive or an assembly reference?)

My Unity version is 2018.3.14f1 My Vuforia version is 8.1.7

My code following the tutorial:

using Vuforia;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class SimpleCloudHandler : MonoBehaviour, ICloudRecoEventHandler 
{
    private CloudRecoBehaviour mCloudRecoBehaviour;
    private bool mIsScanning = false;
    private string mTargetMetadata = "";
    public ImageTargetBehaviour ImageTargetTemplate;

    public void OnInitialized(TargetFinder targetFinder) {
        Debug.Log ("Cloud Reco initialized");
    }

    public void OnInitError(TargetFinder.InitState initError) {
        Debug.Log ("Cloud Reco init error " + initError.ToString());
    }

    public void OnUpdateError(TargetFinder.UpdateState updateError) {
        Debug.Log ("Cloud Reco update error " + updateError.ToString());
    }

    public void OnStateChanged(bool scanning) {
        mIsScanning = scanning;
        if (scanning)
        {
            // clear all known trackables
            var tracker = TrackerManager.Instance.GetTracker<ObjectTracker>();
            tracker.TargetFinder.ClearTrackables(false);
        }
    }

    // Here we handle a cloud target recognition event
    public void OnNewSearchResult(TargetFinder.TargetSearchResult targetSearchResult) {
        TargetFinder.CloudRecoSearchResult cloudRecoSearchResult = 
            (TargetFinder.CloudRecoSearchResult)targetSearchResult;
        // do something with the target metadata
        mTargetMetadata = cloudRecoSearchResult.MetaData;
        // stop the target finder (i.e. stop scanning the cloud)
        mCloudRecoBehaviour.CloudRecoEnabled = false;

        // Build augmentation based on target
        if (ImageTargetTemplate) {
            // enable the new result with the same ImageTargetBehaviour:
            ObjectTracker tracker = TrackerManager.Instance.GetTracker<ObjectTracker>();
            ImageTargetBehaviour imageTargetBehaviour =
                (ImageTargetBehaviour)tracker.TargetFinder.EnableTracking(
            targetSearchResult, ImageTargetTemplate.gameObject);
        }
    }

    void OnGUI() {
        // Display current 'scanning' status
        GUI.Box (new Rect(100,100,200,50), mIsScanning ? "Scanning" : "Not scanning");
        // Display metadata of latest detected cloud-target
        GUI.Box (new Rect(100,200,200,50), "Metadata: " + mTargetMetadata);
        // If not scanning, show button
        // so that user can restart cloud scanning
        if (!mIsScanning) {
            if (GUI.Button(new Rect(100,300,200,50), "Restart Scanning")) {
            // Restart TargetFinder
            mCloudRecoBehaviour.CloudRecoEnabled = true;
            }
        }
    }

    // Start is called before the first frame update
    void Start()
    {
        mCloudRecoBehaviour = GetComponent<CloudRecoBehaviour>();

        if (mCloudRecoBehaviour){
            mCloudRecoBehaviour.RegisterEventHandler(this);
        }
    }

    // Update is called once per frame
    void Update()
    {

    }
}

Mitch · Answer 1 · 2019-08-02T19:09:46.157

I had the same problem on Unity 2019.1.12f1. The problem is that the tutorial is out of date. See e.g. this site saying that ICloudRecoEventHandler was renamed into IObjectRecoEventHandler and this post, where the two Vuforia samples BASE and BOOKS are recommended to use.

I have worked through this recently and found that the following script works as SimpleCloudHandler.cs.

If you like, get in touch and we help each other on the way!

using UnityEngine;
using Vuforia;
public class SimpleCloudHandler : MonoBehaviour, IObjectRecoEventHandler
{
    private CloudRecoBehaviour mCloudRecoBehaviour;
    private bool mIsScanning = false;
    private string mTargetMetadata = "";
    // Use this for initialization
    void Start()
    {
        // register this event handler at the cloud reco behaviour
        mCloudRecoBehaviour = GetComponent<CloudRecoBehaviour>();

        if (mCloudRecoBehaviour)
        {
            mCloudRecoBehaviour.RegisterEventHandler(this);
        }
    }

    public void OnInitialized(TargetFinder targetFinder)
    {
        Debug.Log("Cloud Reco initialized");
    }
    public void OnInitError(TargetFinder.InitState initError)
    {
        Debug.Log("Cloud Reco init error " + initError.ToString());
    }
    public void OnUpdateError(TargetFinder.UpdateState updateError)
    {
        Debug.Log("Cloud Reco update error " + updateError.ToString());
    }


    /// <summary>
    /// when we start scanning, unregister Trackable from the ImageTargetBehaviour, 
    /// then delete all trackables
    /// This function is from CloudRecoEventHandler.cs from Vuforia Base sample
    /// </summary>
    public void OnStateChanged(bool scanning)
    {
        Debug.Log("<color=blue>OnStateChanged(): </color>" + scanning);

        // Changing CloudRecoBehaviour.CloudRecoEnabled to false will call:
        // 1. TargetFinder.Stop()
        // 2. All registered ICloudRecoEventHandler.OnStateChanged() with false.

        // Changing CloudRecoBehaviour.CloudRecoEnabled to true will call:
        // 1. TargetFinder.StartRecognition()
        // 2. All registered ICloudRecoEventHandler.OnStateChanged() with true.
    }


    // Here we handle a cloud target recognition event
    public void OnNewSearchResult(TargetFinder.TargetSearchResult targetSearchResult)
    {
        TargetFinder.CloudRecoSearchResult cloudRecoSearchResult =
            (TargetFinder.CloudRecoSearchResult)targetSearchResult;
        // do something with the target metadata
        mTargetMetadata = cloudRecoSearchResult.MetaData;
        // stop the target finder (i.e. stop scanning the cloud)
        mCloudRecoBehaviour.CloudRecoEnabled = false;
    }


    void OnGUI()
    {
        // Display current 'scanning' status
        GUI.Box(new Rect(100, 100, 200, 50), mIsScanning ? "Scanning" : "Not scanning");
        // Display metadata of latest detected cloud-target
        GUI.Box(new Rect(100, 200, 200, 50), "Metadata: " + mTargetMetadata);
        // If not scanning, show button
        // so that user can restart cloud scanning
        if (!mIsScanning)
        {
            if (GUI.Button(new Rect(100, 300, 200, 50), "Restart Scanning"))
            {
                // Restart TargetFinder
                mCloudRecoBehaviour.CloudRecoEnabled = true;
            }
        }
    }
}

The type or namespace name 'ICloudRecoEventHandler' could not be found

1 Answers1