Java JNI 入门篇——传递数组与修改数组

这里不在重复Java JNI 的开发过程了，不熟悉的同学请参考：Java JNI HelloWorld 直接上主要代码：
ArrayJNI.java

package com.example.jni;public class ArrayJNI {    static {        System.loadLibrary("arrayjni");    }    public native byte[] process(byte[] data);    public static void main(String[] args) throws Exception {        byte[] srcbyte = new byte[] { 1, 2, 3 };        ArrayJNI item = new ArrayJNI();        byte[] resultbyte = item.process(srcbyte);        System.out.print("(Java)result byte: ");        for (int i = 0; i < resultbyte.length; i++) {            System.out.printf("%d\t", 0xff & resultbyte[i]);        }        System.out.println();    }}

arrayjni.cpp

// arrayjni.cpp : Defines the exported functions for the DLL application.//#include "stdafx.h"#include "com_example_jni_ArrayJNI.h"#include <iostream>/** Class:     com_example_jni_ArrayJNI* Method:    process* Signature: ([BII)[B*/JNIEXPORT jbyteArray JNICALL Java_com_example_jni_ArrayJNI_process(JNIEnv * env, jobject obj, jbyteArray byteArray) {    jbyte* receivedbyte = env->GetByteArrayElements(byteArray, 0);    jsize size = env->GetArrayLength(byteArray);    printf("(C++) received byte: ");    for (int i = 0; i < size; i++) {        int value = (int)(receivedbyte[i] & 0xff);        printf("%d\t",value);        jbyte v = (~value);        env->SetByteArrayRegion(byteArray, i, 1, &v);    }    return byteArray;}

ok!