public class Plcio {
	private native int open(String plcName);
	static {
		//System.loadLibrary("test");
		System.load("/home/usr/plcioExampleslib/libtest.so");
	}
 
	
	public static void main(String[] args) {
		Plcio plcio = new Plcio();
		int result = plcio.open("virtual");
		System.out.println("result = " + result);
	}
}

#ifndef _PLC_H
#define _PLC_H
 
#include<iostream>
#include<string>
#include<vector>
#include<plc.h>
#include<jni.h>
 
typedef PLC* plcPointer;
 
class Plc{
 
public:
	Plc() { }
	Plc(const std::string &plctype, const std::vector<int> &data):_plctype(plctype),_data(data) {}
 
	JNIEXPORT jint JNICALL Java_Plcio_open (JNIEnv *env, jobject jobj, jstring name) ;
 
private:
	plcPointer _ptr;
	const std::string _plctype;
	std::vector<int> _data;
};
 
 
#endif

#include "Plc.h"
#include <jni.h>
 
using namespace std;
 
JNIEXPORT jint JNICALL  Plc::Java_Plcio_open (JNIEnv *env, jobject jobj, jstring name) {
 
  const char *plcname = (env)->GetStringUTFChars(name, 0);
  _ptr = plc_open(const_cast<char*>(plcname));
  env->ReleaseStringUTFChars(name, plcname);
 
  if(_ptr == NULL) {
    plc_print_error(_ptr, "plc_open\n");
    return -1;
  } else 
      cout << " open successfully " << endl; 
  return 0;    
}

(env)->GetStringUTFChars(name, 0);

(env)->GetStringUTFChars(env, name, null);