how to convert static String return into JNI

[Jhovarie Guiang]

Hello i now this is basic and i hope some one helps please read.

Sample #1
--> Start
//this is a java code that calls the JNI to print "Hello World"
class HelloWorld {
static {
//System.loadLibrary("HelloWorld");
System.load("C:/HelloWorld.dll");
}
private native void print();

public static void main(String[] args) {
new HelloWorld().print();
}
}

#include <jni.h>
#include <stdio.h>
#include "HelloWorld.h"

JNIEXPORT void JNICALL
Java_HelloWorld_print(JNIEnv *env, jobject obj)
{
printf("Hello Java Native Interface.\n");
return;
}
--> End

And i want to do is that java will get the value of string variables from JNI and it will print hello world. for example in using java like this.

Sample #2
--> Start
public class classOne {
public static void main(String[]args){
String stringfrom_classTwo = classTwo.pblic_static_str();
System.out.println(stringfrom_classTwo);
}
}

// how to convert classTwo into a JNI?
public class classTwo {
public static String public_static_str(){
String str = "Hello World";
return str;
}
}
--> End

[Ernest Friedman-Hill]

Hi,

Welcome to JavaRanch!

You want to use the NewStringUTF() function, which you can see an example of here. That link is to an online copy of the JNI programmer's manual and guide -- it should answer any questions you have.

[Jhovarie Guiang]

i cant understand the tutorials from that link can any one post a sample code using NewStringUTF() and access it on java string variable?

im telling that code like this

//java code

public class Main{
 public static void main(String[]args){
   String strfromJNI = ""; //<-- i dont know how to access string ("NewStringUTF()") from JNI
   System.out.println(strfromJNI);
 }
}

JNI code

 JNIEXPORT jstring JNICALL {
/*
 //assuming this is java and how to convert this into a JNI?
  //Method that return a string 
  String str = "HelloWorld"; 
  return str;
  */
}