JNA(一) 环境准备

什么是JNA

Java Native Access(JNA)

JNA 使 Java 程序可以轻松访问本地共享库,而无需编写 Java 代码之外的任何内容 - 不需要 JNI

JNA 允许使用自然 Java 方法直接调用本地函数,和平常写代码一样,大多数情况下无需特殊处理或配置

JNA 使用小型 JNI 库来动态调用本地代码,开发人员使用Java接口来描述目标动态库中的函数和结构。这使得调用本地平台功能变得非常容易,而不会产生为多个平台配置和构建 JNI 代码的高开销

技术要求

对C有一定的了解

对Java较为熟练

对docker有所了解(本教程通过docker搭建linux环境,如果有现成的虚拟机或者云服务器,可以不用docker)

开发环境

  • 操作系统:Windows 10 专业版

  • jdk: 1.8.0_241 64位

  • java开发工具:IntelliJ IDEA 2023.2.1

  • dll开发工具:CLion 2023.2.2

  • JNA版本:5.13.0

    <dependency>
        <groupId>net.java.dev.jna</groupId>
        <artifactId>jna-platform</artifactId>
        <version>5.13.0</version>
    </dependency>
  • dll分析神器:Dependency Walker (可选),这个东西有缓存,在检查dll函数不变的情况下,需要关闭后重新打开,再查看dll库才有变化

    下载地址:GitCode - 开发者的代码家园

  • 安装 docker desktop(可选)

Features Automatic mapping from Java to native functions, with simple mappings for all primitive data types Runs on most platforms which support Java Automatic conversion between C and Java strings, with customizable encoding/decoding Structure and Union arguments/return values, by reference and by value Function Pointers, (callbacks from native code to Java) as arguments and/or members of a struct Auto-generated Java proxies for native function pointers By-reference (pointer-to-type) arguments Java array and NIO Buffer arguments (primitive types and pointers) as pointer-to-buffer Nested structures and arrays Wide (wchar_t-based) strings Native long support (32- or 64-bit as appropriate) Demo applications/examples Supported on 1.4 or later JVMs, including JavaME (earlier VMs may work with stubbed NIO support) Customizable marshalling/unmarshalling (argument and return value conversions) Customizable mapping from Java method to native function name, and customizable invocation to simulate C preprocessor function macros Support for automatic Windows ASCII/UNICODE function mappings Varargs support Type-safety for native pointers VM crash protection (optional) Optimized direct mapping for high-performance applications. COM support for early and late binding. COM/Typelib java code generator. Community and Support All questions should be posted to the jna-users Google group. Issues can be submitted here on Github. When posting to the mailing list, please include the following: What OS/CPU/architecture you're using (e.g. Windows 7 64-bit) Reference to your native interface definitions (i.e. C headers), if available The JNA mapping you're trying to use VM crash logs, if any Example native usage, and your attempted Java usage It's nearly impossible to indicate proper Java usage when there's no native reference to work from. For commercial support, please contact twalljava [at] java [dot] net. Using the Library Getting Started Functional Description. Mapping between Java and Native Using Pointers and Arrays Using Structures and Unions Using By-Reference Arguments Customization of Type Mapping Callbacks/Function Pointers/Closures Dynamically Typed Languages (JRuby/Jython) Platform Library Direct Method Mapping (Optimization) Frequently Asked Questions (FAQ) Avoiding Crashes Primary Documentation (JavaDoc) The definitive JNA reference is in the JavaDoc. Developers Contributing to JNA Setting up a Windows Development Environment Setting up an Android Development Environment Setting up a RaspberryPi Development Environment Setting up a Mac Development Environment Releasing JNA Publishing to Maven Central Contributing You're encouraged to contribute to JNA. Fork the code from https://github.com/java-native-access/jna and submit pull requests. For more information on setting up a development environment see Contributing to JNA. If you are interested in paid support, feel free to say so on the jna-users mailing list. Most simple questions will be answered on the list, but more complicated work, new features or target platforms can be negotiated with any of the JNA developers (this is how several of JNA's features came into being). You may even encounter other users with the same need and be able to cost share the new development. License This library is licensed under the LGPL, version 2.1 or later, and (from version 4.0 onward) the Apache Software License, version 2.0. Commercial license arrangements are negotiable. NOTE: Oracle is not sponsoring this project, even though the package name (com.sun.jna) might imply otherwise.
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