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: 10 months 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
- License: mit
- Created: 2014-12-04T16:06:06.000Z (about 11 years ago)
- Default Branch: master
- Last Pushed: 2024-12-17T19:45:32.000Z (about 1 year ago)
- Last Synced: 2025-03-28T21:11:17.913Z (10 months ago)
- Topics: cpp, example, java, jna, jni, swig
- Language: CMake
- Homepage:
- Size: 15.6 KB
- Stars: 149
- Watchers: 4
- Forks: 38
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE.txt
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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
----
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
---
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
---
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.