JNA and Groovy

C compile Linux

gcc -o libgreet.so -shared greet.c

C compile OSX

gcc -dynamiclib greet.c -o libgreet.dylib

greet.c

#include <stdio.h>
#include <stdlib.h>

void greet( char * name, void * buf, long buflen ) {
  snprintf( buf, buflen, "Hello %s", name ) ;
}

Run groovy

groovy test.groovy

test.groovy

@Grab( 'net.java.dev.jna:jna:3.4.0' )
import com.sun.jna.Library
import com.sun.jna.Native
import com.sun.jna.Memory

interface Greet extends Library {
  public void greet( String name, Memory buffer, long len )
}

def test = Native.loadLibrary( 'greet', Greet )

// Generate a return buffer
def buf = new Memory( 1024 )

// Call the C function
test.greet( 'Tim', buf, buf.size() )

// Print the result
println buf.getString( 0, false )