jna调用c++动态库实体类传参

1、win10平台代码 c++ 头文件

pch.h

cpp 复制代码

#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;

EXPORT void example3_sendStruct(const Example3Struct* sval);
#endif //PCH_H

cpp文件 pch.cpp

cpp 复制代码

// 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;
	}

使用Visual Studio 导出动态库

java 调用

复制代码

VideoAiLibrary.java

java 复制代码

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;
    }

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

测试

cpp 复制代码

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);
    }

}

linux 代码唯一区别是 pch.h头文件内容如下

cpp 复制代码

#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;

EXPORT void example3_sendStruct(const Example3Struct* sval);
#endif //PCH_H

bash 复制代码

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

通过百度网盘分享的文件：JNA_TEST.zip

链接：https://pan.baidu.com/s/1uA4r8gJM5-vut73OoAQZMg?pwd=4ob0

提取码：4ob0