[5.3.1p1] WWW.isDone hangs in iOS

It seems that WWW.isDone broke in 5.3.1. This used to work fine in 5.2

This code hangs in iOS:

Code (csharp):

1.  
2. private IEnumerator DownloadFile( string url )
3. {
4.     var www = new WWW( url );
5.  
6.     while ( !www.isDone )
7.     {
8.         Debug.Log( "Never gets here" );
9.         yield return null;
10.     }
11. }
12.  

When running on iOS, the call to www.isDone doesn't return. If I pause the game in XCode, and resume execution.. then it works fine.

Doing the usual yield return www works fine.

 

Similar to this issue: My code used to work fine in 5.3.0 and in 5.3.1f1 and 5.3.1p1 WWW never returns from yield:

Code (CSharp):

1. public IEnumerator fetchImageAtUrl( string url, Action<Texture2D> completionHandler )
2. {
3.      var www = new WWW( url );
4.    
5.      yield return www;
6.      Debug.Log("Never gets here");
7.  
8.      if( !string.IsNullOrEmpty( www.error ) )
9.      {
10.            Debug.Log( "Error attempting to load profile image: " + www.error );
11.            if( completionHandler != null )
12.                completionHandler( null );
13.      }
14.      else
15.      {
16.           if( completionHandler != null )
17.               completionHandler( www.texture );
18.      }
19. }

 

In our case, it happened with the Mono scripting backend.. didn't test it with IL2CPP.

Currently we switched to a third party http solution (BestHTTP), will switch back later.

 

Just put together a sample project with the following code:

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3.  
4. public class test : MonoBehaviour
5. {
6.     WWW www;
7.     // Use this for initialization
8.     void Start ()
9.     {
10.         www = new WWW("http://www.google.com");
11.     }
12.    
13.     // Update is called once per frame
14.     void Update ()
15.     {
16.         if (www != null && Time.frameCount % 5 == 0)
17.         {
18.             Debug.LogFormat("www.isDone: {0}",www.isDone);
19.             Debug.LogFormat("www.error: {0}",www.error);
20.             Debug.LogFormat("www.text: {0}",www.text);
21.         }
22.     }
23. }
24.  

I compiled it with both mono2x and IL2CPP and the output was the same(repeating forever):
www.isDone: False
UnityEngine.DebugLogHandler:Internal_Log(LogType, String, Object)
UnityEngine.DebugLogHandler:LogFormat(LogType, Object, String, Object[])
UnityEngine.Logger:LogFormat(LogType, String, Object[])
UnityEngine.Debug:LogFormat(String, Object[])

www.error:
UnityEngine.DebugLogHandler:Internal_Log(LogType, String, Object)
UnityEngine.DebugLogHandler:LogFormat(LogType, Object, String, Object[])
UnityEngine.Logger:LogFormat(LogType, String, Object[])
UnityEngine.Debug:LogFormat(String, Object[])

UnityException: WWW is not ready downloading yet
at UnityEngine.WWW.get_text () [0x00000] in <filename unknown>:0

 

I tried reproducing the issue on new projects to file a bug report but failed. Seems everything works fine when creating new projects; must be something specific to the project I'm working on that is causing the issue.

Anyway, I found a workaround suggested by another user in this thread, so I guess everything is all right now.

Thank you

 

I'm having the same issue right now. I first tried 5.3.1p2 first, but no success. Next I tried the 5.3.0 workaround, but this also didn't work for me. Seems like the workaround is not working for everybody, so if there would be a hotfix available, please post it.

 

Yes! I saw Christopher commenting about it on the other thread! Thank you

@pahe Did you try replacing the WWWconnection.mm file from the Xcode project with another from a previous 5.3.x project that works?

 

@Elkis Yes, I used the WWWconnection.mm file from 5.3.0, but it didn't work with that version. The last version I'm sure it worked with is 5.2.3, but reverting back to that version is... a lot of work with the scene management change.

Also tested the WWW class from 5.3.1f1 and 5.3.1p2, but non of those worked. :/

I'm trying to download assetbundles with it, waiting for .isDone before returning it. Works fine on all other platforms, but iOS.

 

@JoshPeterson do you know if the iOS team has already found what the problem is? If it's possible to fix with just altering the WWWConnection.mm file, I could do it by myself. Would be great to know, as we're kind of stuck right now. Reverting back to 5.2.x would be much work for us, though we're considering it currently.

 

Thanks and sure, I'll try tomorrow again and make a fresh install with 5.3.1p2.

 

@christophergoy First, thanks for your effort! I checked your new WWWConnection.mm and I can confirm following things:

1. original 5.3.1p2 WWW didn't work for us.
2. your posted WWWConnection.mm did fix the downloading problem for downloads from web.
3. your posted WWWConnection.mm doesn't work for local file requests (i.e. file:///).

I'm not sure if that wasn't working with the original WWW file too, as we have the following process in our app:
1. download text file from web (a file which stores assetbundle versions).
2. download assetbundles by checking first if it is on the local disk and else download it from web.

Code (CSharp):

1.  
2.         Debug.Log("TryToLoadFromDisk: " + StreamingAssetPath + anAssetName + " Version: " + anAssetbundleInfo.version);
3.  
4.         var aLocalAssetWWW = new WWW(StreamingAssetPath + anAssetName);
5.    
6.         //Wait for the WWW to be initialized
7.         Debug.Log("TryToLoadFromDisk: Wait for the WWW to be initialized");
8.         yield return aLocalAssetWWW;
9.  
10.         Debug.Log("TryToLoadFromDisk: WWW is initialized, now wait for isDone");
11.  
12.         while (!aLocalAssetWWW.isDone)
13.         {
14.             Debug.Log("TryToLoadFromDisk: Wait for the WWW. Is done: " + aLocalAssetWWW.isDone);
15.             yield return aLocalAssetWWW;
16.         }
17.  

This code runs till the "yield return aLocalAssetWWW;" and stops then on iOS.

Spoiler: xCode log output

TryToLoadFromDisk: file:////var/mobile/Containers/Bundle/Application/<appnamehash>/<appname>.app/Data/Raw/2_1_2/iOS/Atlases/gearicons.assetbundle Version: 8
<tryToLoadAssetFromDisk>d__4:MoveNext()
ResourceLoader:loadAssetBundle(String, String, AssetbundleInfo, AssetBundleResourceLoadedCallback, Object[])
PreLoadingScreenViewController:loadAtlasAssetBundles(Single)
<loadAssetBundles>c__Iterator60:MoveNext()

TryToLoadFromDisk: Wait for the WWW to be initialized
<tryToLoadAssetFromDisk>d__4:MoveNext()
ResourceLoader:loadAssetBundle(String, String, AssetbundleInfo, AssetBundleResourceLoadedCallback, Object[])
PreLoadingScreenViewController:loadSingleAtlas(String, Boolean)
PreLoadingScreenViewController:loadAtlasAssetBundles(Single)
<loadAssetBundles>c__Iterator60:MoveNext()
(Filename: /Users/builduser/buildslave/unity/build/artifacts/generated/common/runtime/UnityEngineDebugBindings.gen.cpp Line: 37)

 

Hey @christophergoy,
I commented out the part of simply returning the www and now it works also on iOS. So, there seems to be a change then in the WWWConnection class which breaks our code.

 

@christophergoy Can you give a short instruction how to use WWWConnection.mm? I also have an issue with WWW and redirects, and want to try your workaround.

 

Simply replace the file in your xCode project under Classes/Unity/ should do the trick.

Yes and yes.

 

Fine. I get it. I just need to replace this file in Xcode project. But it doesn't help with redirects.

 

I try to get profile pictures from Facebook:

Code (csharp):

1. IEnumerator LoadPictures(List<string> ids) {
2.     foreach (string id in ids) {
3.         if (!pictures.ContainsKey(id)) {
4.             WWW request = new WWW("https://graph.facebook.com/v2.4/" + id + "/picture?type=square");
5.             yield return request;
6.  
7.             if (request.error == null && request.texture != null) {
8.                 pictures[id] = Sprite.Create(request.texture, new Rect(0,0, 50, 50), new Vector2());
9.             }
10.         }
11.     }
12. }

Concrete URL: https://graph.facebook.com/v2.4/100000479582531/picture?type=square.

The same code works fine on Android. And it worked on iOS with previous Unity versions (5.1 and 5.2).
Now I work with 5.3.1p2.

 

Yep, now it works as expected. Thanks!

 

@christophergoy
I can confirm that also your new WWWConnection class can download from web, but still is not running through the yield return www;

I'll try to create a small repro project for you and post the case number then.

 

@christophergoy

The problem seems only affecting local file requests and then yield returning the WWW. I created a test project for you (c: 761361) to test it.
Sorry for the messed up loader, but it was a bit complicated to remove the other stuff. Essentially the "tryToLoadAssetFromDisk" function is the point where the code hangs later.

 

Hi, I have also similar problem with Asset bundles loading from cache. When I load asset bundles with function WWW.LoadFromCacheOrDownload() for the first time it works, but when the code is trying to get them from cache - isDone is never called and app gets stuck and crashes.

Here I posted a thread and there are also logs:
http://forum.unity3d.com/threads/ios-asset-bundle-crash-on-decompression-in-unity-5-3-1p3.380558/
I’m using Unity 5.3.1p3.

I’m not sure if there is a problem because we call WWW.LoadFromCacheOrDownload() from Update(), and we check in Update() for isDone to happen. Would this be fixed if we would use Cooroutine and yield instead?

I have also replace the WWWConnection file in XCode, but the issue still stays.

In Unity 5.2 the same code is working fine.

 

Hi,
I have tried this morning, but unfortunatly it's still not fixed for the local files that I'm trying to get from cache. What is actually the problem with the www class?

 

@christophergoy Worked for us! Thanks a lot!

 

A new patch is out today 5.3.1p4
I can't see anything in the build notes for these issues?

 

I have submitted the bug report - Case 765304

 

@christophergoy Just to clarify, if I get the new Unity 5.3.2 I'm likely to have a problem with WWW.isDone?

 

@christophergoy can you please give us an update for this?

 

@christophergoy all the problems are solved with 5.3.2p1

 

@aixa based on your replay i also tried to use Unity 3D 5.3.2p1, But my end its not solved.i am facing same issue., Even when i replaced WWWConnection.mm no use in 5.3.2 p1.

 

I had to replace WWWConnection.mm in 5.3.2p2 as well. @christophergoy can you confirm that the bug hasn't reappeared?