Unity3d - Failed to load 'Assets/Plugins/QCARWrapper.dll'

Question

I want to use c++ dll on unity android application. To use native dll on a android device, I learn that I should use Unity 5. I download unity5 from here. My application req

Answer 1

I had the same problem /Failed to load 'Assets/Plugins/QCARWrapper.dll'/ with vuforia plugin and latest version of Unity ( currently 5.1.2f 64bits ) and also couldn't get my laptop camera to work.

Everything is fixed with the 32 bit release of Unity, even if my os is 64 bits (Windows 7).

Answer 2

Vuforia 5.0 supports the 32bit version of the Unity Editor on Windows, and the 64bit version on Mac.

So, There are two possible solutions:

1. you just need to install and use the Unity 5 32bit Editor, on Windows.

OR

2. Create a new folder "x86" inside

   Assets>>Plugins

   inside your unity project structure Then move the following files from "Plugins" to newely created "x86" folder.

   • QCARWrapper.lib
   • QCARWrapper.dll
   • QCARWrapper.dll.signature
   • QCARWrapper.exp

After that check log message, If you see the log like:

Setting platform to 'Editor' for plugin: Assets/Plugins/x86/VuforiaWrapper.dll
UnityEngine.Debug:Log(Object)
Vuforia.EditorClasses.ExtensionImport:UpdatePluginSettings() (at Assets/Vuforia/Editor/Scripts/ExtensionImport.cs:43)
UnityEditor.EditorApplication:Internal_CallUpdateFunctions()

Then , Congrats !! You are ready to Go!

Answer 3

Go to https://unity3d.com/get-unity/update Under there, you will see ADDITIONAL DOWNLOADS Under that you will see FOR WINDOWS. Click it and choose Unity Editor (32-bit).

EDIT: I see lots of dowvotes. This was the ONLY solution when this question was asked. Unity 5 64bit just got released when this question WAS asked and this was the ONLY solution back then. This answer was changed to the current answer that was provided 5 months later when Vuforia released 64bit version of their plugin.

Answer 4

If you are using Unity 5.1, make sure to set the right Graphics API settings in the Player Settings for Android and iOS:

disable the "Automatic Graphics API" checkbox in the Graphics APIs list, make sure that only OpenGL ES 2.0 is included: Android: remove OpenGL ES 3.0 iOS: remove OpenGL ES 3.0 and METAL

Important : 1. In your Unity project:

Select the QCARWrapper.bundle in the Unity Project view (located under Assets > Plugins ), so that its settings are shown in the Unity Inspector Change the settings of QCARWrapper.bundle in the Unity inspector from "Any Platform" to "Standalone + Editor".

Rebuild

​OR:

2. In the Xcode project generated by Unity:

Go to Build Phases > Copy Bundle Resources Remove the QCARWrapper.bundle file from the list Rebuild

My unity3d version is 5 and 64bit ,Os is Windows7 64 bit.

my Problems solved .

Edit :

Unity editor couldn't show laptop camera ,But Rebuild Project , camera work . for example rebuild Android platform , and install .apk on device => application Ok .

Answer 5

Go to Name_Vuforia_Unity_Project\Assets\Plugins and you will find QCARWrapper.dll.

Delete it and try again (could be necessary to restart unity).

Unity 64 bit

Answer 6

To use Vuforia with Unity 64 bit, just move the QCARWrapper DLLs from /Plugins to /Plugins/x86. These are the DLLs:

• QCARWrapper.exp
• QCARWrapper.lib
• QCARWrapper.dll
• QCARWrapper.dll.signature

This should solve the problem!