Groovy JNAerator example using JNA and BridJ

compile.bat

@echo off
REM Compile script on Windows machine
echo Compiling C
gcc -c -I"%JAVA_HOME%\include" -I"%JAVA_HOME%\include\win32" hello.c
echo Generating o library
gcc -Wl,--add-stdcall-alias -shared -o hello.dll hello.o
echo Generate header interface using JNAcreator
java -jar jnaerator.jar -mode Jar -jar hello.jar -runtime JNA -library hello hello.h 
rem java -jar jnaerator.jar -mode Jar -jar hello.jar -runtime BridJ -library hello hello.h 
echo Running groovy script
groovy -cp "jnaerator.jar;hello.jar" hello.groovy
rem (I got jnaerator.jar after compiling: "https://github.com/nativelibs4java/JNAerator" look for jnaerator-*shraded.jar) or get it from here:
rem http://www.4shared.com/file/NArd2rh2ce/jnaerator.html
rem clean folder
rem del *.o; del hello.dll; del hello.jar
pause

hello.c

#include <stdio.h>

void printValue(char* value) {
  
  for (int i = 0; i< 5; i++){
    printf("i=%d\n", i);
  }
	printf("\n%s\n\n", value);
}

hello.groovy

import java.nio.ByteBuffer
import com.sun.jna.Native

import java.nio.charset.Charset
import org.bridj.Pointer
import org.bridj.Pointer.StringType

import hello.HelloLibrary


def framework = HelloLibrary.class.isAnnotationPresent(org.bridj.ann.Library)? 'BridJ': 'JNA'

def value = "Go go gadget ${framework}"
try {

  if (framework == 'JNA'){
	// Build a ByteBuffer - roughly analagous to a Pointer to memory block
	value = ByteBuffer.wrap(Native.toByteArray(value))
  
	// Tell JNA to build an interface to the Native Library
	def library = Native.loadLibrary(HelloLibrary.class)
  
	// Pass the ByteBuffer to the Native Library function
	library.printValue(value)
  
  } else { // BridJ
  
	// Build a pointer to your String (turn it into a more C-like String)
	value = Pointer.pointerToString("Go go gadget BridJ", StringType.C, Charset.defaultCharset())
  
	// Invoke native library method (with BridJ doing the heavy lifting)
	HelloLibrary.printValue(value)
  
  }

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

hello.h

#ifndef nativegroovy_h__
#define nativegroovy_h__

extern void printValue(char* value);

#endif //nativegroovy_h__