Truyền kiểu struct từ C lên JAVA?

[haian]

#include <jni.h>#include "Hello.h"#include <stdio.h> struct student{    char *name;    int age;}student1; student1.name="Jack";student1.age=23; JNIEXPORT jobject JNICALLJava_Hello_sayHello(JNIEnv *env, jobject obj, jintArray arr){    return arr;}

java của mình thế này

public class Hello{    static    {        System.loadLibrary("hello");    }     public native Object sayHello(int [] arr);    public static void main(String[] args)    {        Hello p = new Hello();        int arr[] = new int[10];        for (int i = 0; i < 10; i++) {            arr[i] = i;        }        int [] len = (int[]) p.sayHello(arr);         System.out.println("sum = " + len.length); //length of the array    }}

bây giờ từ C mình muốn return lại số sinh viên đã đăng ký, phỉa làm thế nào vậy ???


sửa tiếp

public class Hello{    static    {        System.loadLibrary("hello");    }     public static native Student sayHello();    public static void main(String[] args)    {        Hello p = new Hello();         Student len = p.sayHello();         System.out.println("Name = " + len.name);        System.out.println("Age = " + len.age);    }     public class Student    {        private int age;        private String name;         public Student(int age, String name)        {            this.age = age;            this.name = name;        }         // the rest of the class    } }

#include <jni.h>#include "Hello.h"#include <stdio.h> struct student{    char *name;    int age;  }student1; JNIEXPORT jobject JNICALLJava_Hello_sayHello(JNIEnv *env, jclass cls){     jmethodID constructor;    jvalue args[2];    jobject object;      cls = (*env)->FindClass(env, "Hello$Student");     constructor = (*env)->GetMethodID(env, cls, "<init>", "(ILjava/lang/String V");     args[0].i = 23;    args[1].l = (*env)->NewStringUTF(env, "Jack");    object = (*env)->NewObjectA(env, cls, constructor, args);     return object;}

A – Exemple

Programmes Java :

public class Appel {    private native Objet AppelNative();    public static void main(String[] args) {        Objet newObj = null;        Appel a = new Appel();        newObj = a.AppelNative();        System.out.println(newObj.getS());    }    static { System.loadLibrary("Librairie"); }}public class Objet {    private int i;    private String s;    public Objet(int i, String s) {        this.i = i;        this.s = s;    }    public String getS() { return s; }}

Programme C :

#include <jni.h>#include "Appel.h"JNIEXPORT jobject JNICALL Java_Appel_AppelNative (JNIEnv *env, jobject obj) {    jclass classe = (*env)->FindClass(env, "Objet");    jmethodID mid = (*env)->GetMethodID(env, classe, "<init>", "(ILjava/lang/String;)V");    jint valeur = 10;    jstring chaine = (*env)->NewStringUTF(env, "hello");    jobject objet = (*env)->NewObject(env, classe, mid, valeur, chaine);    return objet;}