loading a delphi dll in java using jna

Question

I'm a java newbie and I'm trying to load a delphi dll, and call functions from it.

Already tried in php using winbinder but it seems to be useless: reloading dll in winbinder (php gui) crashes program

Anyway I have this simple java code, and I can't figure out how to make it work. There are some examples over the internet, but none seems to be working for me.

Dll is 32bit, so is my windows, jdk and Eclipse. Simples function to use would be GetDllVersion. I would really apriciate any help.

I can't even load it, here is first error (there are couple popups following):

enter image description here

Here is the code:

import com.sun.jna.Library;
import com.sun.jna.Native;
import com.sun.jna.NativeLong;
import com.sun.jna.Platform;
import com.sun.jna.*;

public class Main {

      static {
        try {
            System.load("C:/workspace/XmlDownlaoder/xxxxxxxDLL.dll");
        } catch (UnsatisfiedLinkError e) {
          System.err.println("Native code library failed to load.\n" + e);
          System.exit(1);
        }
      }

      public static void main(String argv[]) 
      {
        //how to call functions here? - there will be many functions, and final one should generate xml in return

      }
    }

EDIT: Native code library failed to load - this doesn't show on console.

The DLL is raising an exception in its DllMain. That's initialization time. Can you load it from anoth environment. For example Delphi. Or C++. — David Heffernan
– David Heffernan, Commented May 11, 2013 at 23:09
forget about java until you can write a C program that will load the dll — David Heffernan
– David Heffernan, Commented May 12, 2013 at 16:07
I was kinda expecting that coming, and I needed to hear (read) id :) . Thanx. I try my luck with c++. — baron_bartek
– baron_bartek, Commented May 12, 2013 at 19:09

Community · Accepted Answer · 2017-05-23 12:13:04Z

1

Don't load your DLL by hand, let JNA do the grunt work for it.

There are quite a few good resources when you search for Delphi JNA.

A few relevant Stack Overflow questions that explain some of the things you will probably bump into:

edited May 23, 2017 at 12:13

CommunityBot

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answered May 11, 2013 at 21:33

Jeroen Wiert Pluimers

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3 Comments

David Heffernan Over a year ago

None of this will help. The DLL initialization is raising a Delphi exception.

baron_bartek Over a year ago

Thx for this info. Any ideas how to handle this? Since I'm Java newbie maybe it would be easier to become C++/c# Newbie :) - I ask becouse I have no experience with dll nor C

Jeroen Wiert Pluimers Over a year ago

If it also fails loading in other environments, then the best approach is to start trying to load it from a simple Delphi application, then use Delphi to see why it fails to load.

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