https://github.com/remram44/java-cpp-example

Example of using C++ classes from Java. Showcases SWIG, JNA and JNI
https://github.com/remram44/java-cpp-example

cpp example java jna jni swig

Last synced: 11 days ago
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Example of using C++ classes from Java. Showcases SWIG, JNA and JNI

• Host: GitHub
• URL: https://github.com/remram44/java-cpp-example
• Owner: remram44
• Created: 2014-12-04T16:06:06.000Z (almost 10 years ago)
• Default Branch: master
• Last Pushed: 2020-02-12T15:03:48.000Z (over 4 years ago)
• Last Synced: 2024-10-23T04:52:12.393Z (20 days ago)
• Topics: cpp, example, java, jna, jni, swig
• Language: CMake
• Homepage:
• Size: 14.6 KB
• Stars: 145
• Watchers: 5
• Forks: 38
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
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Example of using C++ code from Java

===================================

This repository contains three separate examples of calling a simple C++ library from Java code.

The example library doesn't do anything but contains a class, MyClass, forcing us to support C++ (and not just plain C).

CMake is used to build this, since locating the dependencies got outside the range of my make-fu. The project is supposed to be portable to all major platforms.

Three different wrappers are used, documented below. Each one achieves the same goal, which is using [this C++ class](cpplib/src/MyClass.cpp) from [Java code](java-jni/java/src/edu/nyu/cpptest/app/Main.java).

SWIG

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This needs the SWIG tool: http://www.swig.org/

SWIG parses the C++ header file and generates both the C++ JNI code and the Java native and helper classes.

JNA

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JNA allows Java code to use C dynamic libraries directly. Because our library is in fact C++, a small wrapper is included that wraps it as C code.

You will need the JNA jar to run this: https://github.com/java-native-access/jna

JNI

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This examples uses JNI directly, without auto-generation. The `MyClass` class in Java code just declares its methods as being "native", they are provided by the dynamic library.