koobas.hobune.stream
Loading asset from an asset bundle crashes on ios.
Hi all,
I am experiencing very strange behaviour on ios with asset bundles.
I made some asset bundles, which depends to other asset bundles. On ios i download asset bundles using "on demand resources". I am making sure that they are downloading just fine. Also Debug section of Xcode shows that asset bundles downloaded succesfully. To make sure i log contents of asset bundles and see that the asset that i will request are already there. (I check if my asset name is in assetBundle.GetAllAssetNames() and i find it there.)
But when i try to load an asset using assetbundle.loadassetasync or assetbundle.loadasset the game crashes.
This is the crash log
2017-02-28 12:36:38.435420 VM[741:261572] Uncaught exception: NSRangeException: *** -[_NSZeroData getBytes:range:]: range {408687, 7168} exceeds data length 0
(
0 CoreFoundation 0x000000018bce11d0 <redacted> + 148
1 libobjc.A.dylib 0x000000018a71855c objc_exception_throw + 56
2 CoreFoundation 0x000000018bce1100 <redacted> + 0
3 Foundation 0x000000018c710b9c <redacted> + 276
4 VM 0x0000000100dfad8c _ZN16AssetCatalogFile4ReadEyyPvPy + 132
5 VM 0x0000000100dfa8e0 _ZN29AssetCatalogFileSystemHandler4ReadER13FileEntryDatayyPvPy + 76
6 VM 0x0000000100d59660 _ZN12FileAccessor4ReadEyyPvPy + 68
7 VM 0x0000000100d50eb8 _ZN20ArchiveStorageReader15ReadFromStorageEyyPvPy + 196
8 VM 0x0000000100d509ac _ZN20ArchiveStorageReader9ReadBlockEjyyPvPy + 324
9 VM 0x0000000100d4bfa8 _ZN20ArchiveStorageReader4ReadEyyPvPy + 308
10 VM 0x0000000100d4be4c _ZN15ArchiveReadFile4ReadEyyPvPy + 84
11 VM 0x0000000100d4b1b4 _ZN17ArchiveFileSystem4ReadER13FileEntryDatayyPvPy + 44
12 VM 0x0000000100d59660 _ZN12FileAccessor4ReadEyyPvPy + 68
13 VM 0x0000000100d44d38 _ZN4File4ReadEyPvm + 52
14 VM 0x0000000100ab0e80 _ZN24AsyncReadManagerThreaded11ThreadEntryEv + 216
15 VM 0x0000000100ab0c24 _ZN24AsyncReadManagerThreaded17StaticThreadEntryEPv + 12
16 VM 0x0000000100d24f7c _ZN6Thread16RunThreadWrapperEPv + 96
17 libsystem_pthread.dylib 0x000000018ad75850 <redacted> + 240
18 libsystem_pthread.dylib 0x000000018ad75760 <redacted> + 0
19 libsystem_pthread.dylib 0x000000018ad72d94 thread_start + 4
)
2017-02-28 12:36:38.435860 VM[741:261572] *** Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[_NSZeroData getBytes:range:]: range {408687, 7168} exceeds data length 0'
I tried the same project on Windows platform. Instead of ODR im using WWW. And it works fine on windows.
I found solution of this problem. I am writing it here in case some other people suffer from the same problem.
I was using the code below to load asset bundle
OnDemandResourcesRequest request = OnDemandResources.PreloadAsync(new string[] {bundleName })
After this request finishes the operation i was using the next line of code to create asset bundle
AssetBundle.LoadFromFileAsync("res://"+bundleName);
The problem is while i was doing it i was loosing the reference to the "request" object. And after garbage collecting phase that asset bundle i load started giving errors.
I keep the reference to the "request" object at some place and problem solved.
Thank you very much for sharing your solution, that was exactly the same problem I had.
@Visutate in my case I kept a list with all OnDemandResourcesRequest objects and didn't call the Dispose() until I need to unload all assets. Hope that helps!
What do you mean by keeping reference at some place? Is it like referencing it to a field in singleton?
Yes, just like Singleton for example, must be at least one link which not killed (don't use local variable).
