jna调用c++动态库实体类传参和实体类返回

1、win10 pch.h文件

#ifndef PCH_H
#define PCH_H

// 添加要在此处预编译的标头
#include "framework.h"

#ifdef __cplusplus
#define EXPORT extern "C" __declspec(dllexport)
#else 
#define EXPORT __declspec(dllexport)
#endif


typedef struct Example3Struct {
	int val;
	char* name;
} Example3Struct;

typedef struct Example4Struct {
	int val;
	char* name;
	char* add;
} Example4Struct;

EXPORT void example3_sendStruct(const Example3Struct* sval);

EXPORT Example4Struct example4_getStruct(const Example3Struct* sval3);

#endif //PCH_H

pch.cpp

// pch.cpp: 与预编译标头对应的源文件

#include "pch.h"
#include "iostream"



	void example3_sendStruct(const Example3Struct* sval)
	{
		// note: printfs called from C won't be flushed
		// to stdout until the Java process completes
		std::cout << sval->val << std::endl;
		std::cout << sval->name << std::endl;
	}


	Example4Struct example4_getStruct(const Example3Struct* sval3)
	{
		Example4Struct sval4;
		sval4.val = 23+sval3->val;
		sval4.name = sval3->name;
		sval4.add = sval3->name;
		return sval4;
	}

编译成动态库

java代码 VideoAiLibrary.java

package com.example.demo.jna;

import com.sun.jna.Library;
import com.sun.jna.Structure;


public interface VideoAiLibrary extends Library {

    @Structure.FieldOrder({"val", "name"})
    public static class Example3Struct extends Structure {
        public static class ByReference extends Example3Struct implements Structure.ByReference {
        }

        public int val;
        public String name;
    }

    @Structure.FieldOrder({"val", "name", "add"})
    public static class Example4Struct extends Structure {
        public static class ByValue extends Example4Struct implements Structure.ByValue {
        }

        public int val;

        public String name;

        public String add;
    }

    public Example4Struct.ByValue example4_getStruct(Example3Struct.ByReference sval);

    // unless otherwise specified, ByReference is assumed - but it can't hurt to be explicit
    public void example3_sendStruct(Example3Struct.ByReference sval);
}

java代码 JnaTest.java

package com.example.demo.jna;

import com.sun.jna.Native;

public class JnaTest {

    public static  void main(String ... args){
        final VideoAiLibrary clib = (VideoAiLibrary) Native.load("mycpp11", VideoAiLibrary.class);

        final VideoAiLibrary.Example3Struct.ByReference e3ref = new VideoAiLibrary.Example3Struct.ByReference();
        e3ref.val = 700;
        e3ref.name="朱dddp";
        clib.example3_sendStruct(e3ref);

        final VideoAiLibrary.Example4Struct.ByValue e4val = clib.example4_getStruct(e3ref);
        System.out.println("example 4: " + e4val.val);
        System.out.println("example 4: " + e4val.name);
        System.out.println("example 4: " + e4val.add);
    }

}

linxu只有 pch.h文件有改动

#ifndef PCH_H
#define PCH_H


#ifdef __cplusplus
#ifdef _WIN32
#define EXPORT extern "C" __declspec(dllexport)
#else
#define EXPORT extern "C"
#endif
#else
#ifdef _WIN32
#define EXPORT __declspec(dllexport)
#else
#define EXPORT
#endif
#endif

typedef struct Example3Struct {
	int val;
	char* name;
} Example3Struct;

typedef struct Example4Struct {
	int val;
	char* name;
	char* add;
} Example4Struct;

EXPORT void example3_sendStruct(const Example3Struct* sval);

EXPORT Example4Struct example4_getStruct(const Example3Struct* sval3);
#endif //PCH_H

把百度云盘的代码上传到linux服务器上，先编译c++ 动态库在运行java代码

# CMakeLists.txt 文件所在路径
cd /aiprogram/cpp/JNA_TEST/
 
#编译c++ 动态库
 bash runcpp.sh
 
#运行java代码示例
 bash runjava.sh

linux 编译和java 代码如下

src 下c++代码，include 下c++的.h头文件，java_code 下java代码

linux代码

通过百度网盘分享的文件：JNA_TESTlinux.zip
链接：https://pan.baidu.com/s/194xIzDgw2YaCmhqUNzA2fA?pwd=ko8m
提取码：ko8m

jna调用c++动态库实体类传参和实体类返回

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