Here is my code: // SimpleDll.cpp : Defines the entry point for the DLL application. //

#include "stdafx.h" #include "stdio.h" #include <iostream> #include <cstdlib>

using namespace std;

#ifdef DLLDIR_EX #define DLLDIR __declspec(dllexport) // export DLL information

#else #define DLLDIR __declspec(dllimport) // import DLL information

#endif

// Original C declarations typedef void (*FUNCTION)(); extern "C" __declspec(dllexport) int helloexit(FUNCTION);

BOOL APIENTRY DllMain( HANDLE hModule, DWORD ul_reason_for_call, LPVOID lpReserved ) { return TRUE; }

void FinalFunction(void) { cout<<"Final function called";

}

extern "C" __declspec(dllexport) int helloexit(FUNCTION c) { atexit(FinalFunction); return 123; }

import com.sun.jna.Callback; import com.sun.jna.Library; import com.sun.jna.Native;

public interface ISimpleDll extends Library { ISimpleDll INSTANCE = (ISimpleDll) Native.loadLibrary("SimpleDll", ISimpleDll.class);

public static interface FUNCTION extends Callback { public void callback(); }

int helloexit(FUNCTION function);

}

public class SimpleDll {

ISimpleDll lib = ISimpleDll.INSTANCE;

/** * */ public SimpleDll() { new Thread() { public void run() { int t = lib.helloexit(new FUNCTION() { public void callback() { System.out.println("exit was called"); } }); System.out.println(t); } }.start(); }

/** * @param args */ public static void main(String[] args) { new SimpleDll(); }

The ouput is: 123 Final function called Now, the callback method never invoked, what's wrong with my code?