java使用jna调用C++接口

创建C++接口

创建项目，创建动态连库

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修改 源文件/pch.cpp

#include "pch.h"
#include <stdio.h>

int sayHello(int a,int b) {
    printf("Hello World!");
    return a+b;
}

修改 头文件/pch.h

#include <stdio.h>
extern "C" _declspec(dllexport) int sayHello(int a,int b);

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Java调用

pom添加jna依赖

 <dependency>
            <groupId>net.java.dev.jna</groupId>
            <artifactId>jna</artifactId>
            <version>5.5.0</version>
        </dependency>

创建CLibrary

import com.sun.jna.Library;
import com.sun.jna.Native;

public interface CLibrary extends Library {
    //加载dll链接库
    CLibrary INSTANTCE = (CLibrary) Native.loadLibrary("D:\\develop\\git\\CPlus\\Dll1\\x64\\Debug\\Dll1.dll", CLibrary.class);
    //此方法为链接库中的方法
    int sayHello(int a,int b);
}

创建测试类

public class Main {
    public static void main(String[] args) {
        int result = CLibrary.INSTANTCE.sayHello(2,3);
        System.out.println("sayHello的放回结果:"+result);
    }
}

运行结果

sayHello的放回结果:5
Hello World!