Linux : Unity3d DllImport (“filename”) not working
 

I have imported "Kinect with OpenNI2"( https://www.assetstore.unity3d.com/en/#!/content/10693) from Unity Asset store. When I run the code , I get below error message
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System.DllNotFoundException: UnityInterface2
at (wrapper managed-to-native) KinectWrapper:Init (bool,bool,bool) at KinectManager.Start () [0x00000] in /home/ashok/New Unity Project/Assets/KinectScripts/KinectManager.cs:657
UnityEngine.Debug:LogError(Object) KinectManager:Start() (at Assets/KinectScripts/KinectManager.cs:808)
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The error message is generated when below code is executed

[DllImport("UnityInterface2", SetLastError=true)]
public static extern int Init(bool isInitDepthStream, bool isInitColorStream, bool isInitInfraredStream);

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I have found below things

[DllImport("UnityInterface2", SetLastError=true)] ------- not working
[DllImport("UnityInterface2.dll", SetLastError=true)] ------- not working
[DllImport("UnityInterface2.dylib", SetLastError=true)] ------- not working
[DllImport("UnityInterface2.so", SetLastError=true)] ------- working but do not want to use it ( unreferenced symbols as I am unable to compile the .cpp and .h files properly from https://github.com/rfilkov/OpenNi2UnityInterface to generate .so file)

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UnityInterface2.dll and UnityInterface2.dylib are proper compiled files, but unable to use

can you explain what you are doing

from what i see you are using apple osx "xcode" to run Microsoft software on linux
???
and that makes zero sense

Aim : To do gesture recognition (hand tracking) on Linux

Hardware : Kinect xbox360

Softwares : Linux,OpenNI2, NiTE2

Unity Package used : Kinect with OpenNI2 (https://www.assetstore.unity3d.com/en/#!/content/10693)


Existing things about the package (code ):Its meant for windows OS and Osx (Apple)
(Package contains UnityInterface2.dll (Windows) and libUnityInterface2.dylib(OsX))
(Package does not contain UnityInterface2.so (Linux))

Existing Platform dependency code :
.....Platform Independent C# code (specifying location of OpenNI2/NiTE2 installation directories(OsX/Linux)..............

If(OS == WIndows OS )
use UnityInterface2.dll library [DllImport("UnityInterface2.dll")] ;

else if (OS == OsX )
use libUnityInterface2.dylib library; [DllImport("libUnityInterface2.dylib")] ;


......... Platform Independent C# code (calling functions in library ) ..............

Requirement : To modify the code to make it work with Linux in following ways

1. Use the existing library files (.dll and .dylib ) and call its functions, ie

If( OS == Linux ) use UnityInterface2.dll library; [DllImport("UnityInterface2.dll")]---- (NOT WORKING))

OR

If( OS == Linux ) use libUnityInterface2.dylib Library [DllImport("libUnityInterface2.dylib")](NOT WORKING))


2. Create a .so file (UnityInterface2.so) by compiling the .h and .cpp files in https://github.com/rfilkov/OpenNi2UnityInterface location and use the following code

If( OS == Linux ) use libUnityInterface2.so Library [DllImport("libUnityInterface2.so")]


Result : unreferenced symbols as I am unable to compile the .cpp and .h files properly


Basically Trying to use 1st option, ie to make Linux identify .dll or .dylib files)

unless you MUST USE this Microsoft owned C# code ( requiring MONO on linux to replace "Microsoft Dot Net Framework")
and getting Apples Xcode working on linux

i would look at using OpenCV
it already is linux code

and as far as i know opencv has been used with a MS kinetic for image registration tracking

Hi ,

Can I know if I understood correctly ?

Do I need to replace the '4.5' folder at /usr/bin/mono/lib/ of Linux with '4.5' at C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\ of Windows ?
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I found one thing in Linux

Unity/C# is able to recognize independent .dll files ie
If dll A is not dependent on any other dlls it is recognized

Unity/C# is not able to recognize dependent .dll files ie
If dll A is not dependent on dll B,dll C,dll D etc then dll A is not recognized, although all the 4 dlls( A,B,C,D dlls ) are in same location


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I have used dependency Walker for UnityInterface2.dll and found out that it depends on OpenNI2.dll, NiTE2.dll, msvcp90d.dll and kernel32.dll. I have placed all of these in project folder of Unity and also in 4.5 folder , but the issue still persists.

Can I know how do I make C# code recognize a dll (UnityInterface2.dll) which depends on other dlls
(OpenNI2.dll, NiTE2.dll, msvcp90d.dll and kernel32.dll) in Linux ? Please help