Question

Edited Question:

Trying to use a .dll file from Java using JNA. I’ve managed to:

Add the .dll to the System Library – System.loadLibrary(“NativeLibrary”);

Created a a NativeInterface to map the functions in the .dll/.h file:

public interface NativeInterface extends Library, StdCallLibrary {
        public int methodA(packageURL.NativeInterface.typeDefName n);
        public int methodB();

        public static class typeDefName implements Structure.ByReference{

            public typeDefName(short s) {}  
    }
}

Added the mapping to my function name because its name in the .dll is “mangled” – Found this out using Dependency Walker

        Map options = new HashMap();
    options.
        put(
            Library.OPTION_FUNCTION_MAPPER, 
            new Mapper() {
                public String getFunctionName(NativeLibrary library, Method method) {
                    return super.getFunctionName(library, method);
                }
            }
        );

AND:

class Mapper implements FunctionMapper{
    public String getFunctionName(NativeLibrary library, Method method) {
       return "?" + method.getName() + "@@YAHPAEIPAPAXFPAUtypeDefName@@@Z";
    }

}

Now (What I’m not sure of) Is how to create an Object of typeDefName to pass into Method A

Answer 1

If your goal is just to use an existing DLL from Java, you can use JNA
without doing any native programming at all. JNA accesses the methods of third-party shared libraries dynamically. You could use the library directly or use JNA to write a convenient wrapper entirely in Java.

When you click the link, be sure to scroll down — there’s lots of documentation and stuff, but the top of the page is consumed by a file listing so it doesn’t look very useful until you scroll down.