Trouble with Addressables.DownloadDependenciesAsync

Hey,

I am trying to Download an addressable from my server when I click a button to a scene. The goal is on button click to check for an update addressable and download it while the scene loads. A menu screen will activate and show a slider bar progress, while things work in the background. The addressable download is based on an AddressableLabel "comicbookName." I keep getting an "error CS0138." Here is the code I am using:

using System.Collections;

using UnityEngine;

using UnityEngine.UI;

using UnityEngine.AddressableAssets;

using UnityEngine.ResourceManagement;

using UnityEngine.SceneManagement;

using System;

using System.Collections.Generic;

using UnityEngine.ResourceManagement.AsyncOperations.AsyncOperationHandle;

//using UnityEngine.AsyncOperation;

using UnityEngine.ResourceManagement.AsyncOperations;

using UnityEngine.AddressableAssets.ResourceLocators;



public class DownloaderServerScript : MonoBehaviour

{

   public GameObject loadingScreen;

    public Slider slider;

    public Text progressText;

     public AssetLabelReference comicbookName;



    public void DownloadfromServer()

    {

        StartCoroutine(LoadAsynchronously());

    }



    private IEnumerator LoadAsynchronously()

    {

        AsyncOperation asyncOperation = Addressables.DownloadDependenciesAsync(comicbookName);



        loadingScreen.SetActive(true);



        while (!asyncOperation.isDone)

        {

            float progress = Mathf.Clamp01(asyncOperation.progress / .9f);

           

            progressText.text = progress * 100f + "%";



            slider.value = progress;



            yield return null;

        }

    }

}

I keep getting an error:

Assets\Scripts\DownloaderServerScript.cs(9,7): error CS0138: A 'using namespace' directive can only be applied to namespaces; 'AsyncOperationHandle' is a type not a namespace. Consider a 'using static' directive instead

Please help!

 

Hi,
DownloadDependenciesAsync returns an AsyncOperationHandle and not an AsyncOperation.

 

How do I fix it? Do I change AsyncOperation to AsyncOperationHandle?

 

Yes, if you want to use DownloadDependenciesAsync.
You'll also have to adapt your code, because the API is slightly different between AsyncOperation and AsyncOperationHandle.

 

Ok I am not sure how to do that. Could you help me out with it?

 

This should compile :

Code (CSharp):

1. using System.Collections;
2. using UnityEngine;
3. using UnityEngine.UI;
4. using UnityEngine.AddressableAssets;
5. using UnityEngine.ResourceManagement.AsyncOperations;
6.  
7. public class DownloaderServerScript : MonoBehaviour
8.  
9. {
10.     public GameObject loadingScreen;
11.     public Slider slider;
12.     public Text progressText;
13.     public AssetLabelReference comicbookName;
14.  
15.     public void DownloadfromServer()
16.     {
17.         StartCoroutine(LoadAsynchronously());
18.     }
19.  
20.     private IEnumerator LoadAsynchronously()
21.     {
22.         AsyncOperationHandle asyncOperation = Addressables.DownloadDependenciesAsync(comicbookName);
23.         loadingScreen.SetActive(true);
24.         while (!asyncOperation.IsDone)
25.         {
26.             float progress = Mathf.Clamp01(asyncOperation.PercentComplete / .9f);
27.             progressText.text = progress * 100f + "%";
28.             slider.value = progress;
29.             yield return null;
30.         }
31.     }
32. }
33.  

This is quite a standard programming thing, where you have to see the APIs provided by Unity, and implement them accordingly.
For instance, here is the doc for AsyncOperationHandle:
https://docs.unity3d.com/Packages/c...ent.AsyncOperations.AsyncOperationHandle.html

May I suggest you to read some different programming tutorials, like :
https://unity3d.com/learning-c-sharp-in-unity-for-beginners
You should learn useful things that will help you achieve your goals.

 

Thanks I will check those out