Groovy and JNA simple example (C & C++ on Win64bit)

build.bat

@echo off
echo Compiling C/C++

REM C library
gcc -Wl,--add-stdcall-alias -I"%JAVA_HOME%\include" -I"%JAVA_HOME%\include\win32" -shared -o helloc.dll hello.c

REM C++ library
g++ -Wl,--add-stdcall-alias -I"%JAVA_HOME%\include" -I"%JAVA_HOME%\include\win32" -shared -o hellocpp.dll hello.cpp

echo Running groovy script
groovy -cp hello.dll hello.groovy
REM if you have jna.jar include it to the classpath:
REM groovy -cp "jna.jar;hello.dll" hello.groovy

hello.c

#include <stdio.h>
void printValue(char* value) {
	printf("\n%s\n\n", value);
}

hello.cpp

#include <iostream>

using namespace std;

extern "C" void printValue(char* value){
  cout << value << endl;
}

hello.groovy

// https://mvnrepository.com/artifact/net.java.dev.jna/jna
@Grab(group='net.java.dev.jna', module='jna', version='4.1.0')

import com.sun.jna.Native
import com.sun.jna.Library

// Define an Interface that exactly matches our header file
interface Hello extends Library {
  void printValue(String value)
}

try {
  // Load library into an instance of NativeInterface
  def nativeLibraryC = Native.loadLibrary('helloC', Hello.class)
  def nativeLibraryCpp = Native.loadLibrary('helloCpp', Hello.class)
  
  // Call method - JNA intercepts this and invokes the library for us
  nativeLibraryC.printValue('Groovy JNA execute C library')
  nativeLibraryCpp.printValue('Groovy JNA execute C++ library')

} catch( UnsatisfiedLinkError e ) {
  println 'Failed to load library'
  e.printStackTrace()
}