DllNotFoundException in unity3d plugin for c++ dll

Question

I am working on the Unity Plugin project and try to import the c++ native dll from c# file. But I keep getting dllnotfoundexception.

c++ dll code:

Answer 1

In my case, I have DllNotFoundException: ovrplatiformloader

 Unity   : DllNotFoundException: ovrplatformloader
 Unity   :   at (wrapper managed-to-native) Oculus.Platform.CAPI.ovr_UnityInitWrapperAsynchronous(string)
 Unity   :   at Oculus.Platform.AndroidPlatform.AsyncInitialize (System.String appId) [0x00013] in <29065e843b82403894fca6c6f2974090>:0 
 Unity   :   at Oculus.Platform.Core.AsyncInitialize (System.String appId) [0x0004f] in <29065e843b82403894fca6c6f2974090>:0 
 Unity   :   at DBHelper.Start () [0x00019] in <29065e843b82403894fca6c6f2974090>:0 

My solution is:

1. Re-import files that doesn't work (libovrplatformloader.so)
2. Reconstruct the Platform/Plugins architecture. Old: Platform/Plugins/Android32/libovrplatformloader.so. New: Platform/Plugins/Android/x86/libovrplatformloader.so and Platform/Plugins/Android/armeabi-v7a/libovrplatformloader.so
3. Modify the import setting of libovrplatformloader.so. Change any platform to only Android platform and enable 'load on startup' selection. Choose ARMv7 CPU in armeabit-v7a while choose x86 CPU in x86 folder.