opencv - How to access a file by its path within a shared library plugin with a Unity Android App -

i have written native shared library (.so) in android studio uses opencv cascade classifiers. classifiers have load method requires path file , must called before can used.

i can call load method correctly in android studio first placing required files in res/raw directory of project. create file resource in android app uses shared library:

    inputstream = context.getresources().openrawresource(r.raw.lbpcascade_frontalface);     file rsrcdir = context.getdir("rsrc", context.mode_private);     file rsrc = new file(rsrcdir, "lbpcascade_frontalface.xml");     fileoutputstream os = new fileoutputstream(rsrc);      byte[] buffer = new byte[4096];     int bytesread;     while ((bytesread = is.read(buffer)) != -1) {         os.write(buffer, 0, bytesread);     }     is.close();     os.close();     return rsrc; 

in shared library (c++) can access file following path:

/data/data/com.company.product/app_rsrc/lbpcascade_frontalface.xml 

and works charm.

but need use shared library unity. i've been able access contents of file, resides in "streamingassets" folder, using following script:

ienumerator loadrsrcs() {     var filepath = system.io.path.combine(application.streamingassetspath, "lbpcascade_frontalface.xml");     if (filepath.contains("://"))     {         var www = new www(filepath);         yield return www;         result = www.text;     } } 

and result holds contents of "lbpcascade_frontalface.xml" after www object has extracted file data apk file.

but, how pass file path shared library? can't pass filepath variable because prefixed jar:file://. i.e:

"jar:file://" + application.datapath + "!/assets/"; 

i guess first need write contents file object in unity script somehow , pass path file object i've done in android studio. without context object android api provides, how that?

any help/advice appreciated, or if can suggest better method of achieving same result i'm ears!