CODEWITHSUNDEEP
javajna
Koffy
Koffy

Reputation: 768

How to access static methods?

Using Java and the JNA library, I want to access static methods found within a commercial DLL file (C#).

Unfortunately Java 7 does not allow static methods within an interface, and although Java 8 will amend this the latest beta release appears indifferent.

Suggests/corrections are welcome (I am new to JNA and am avoiding JNI), and I have used Javonet to confirm the method signature.

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

public class INeedHelp {
   public interface MyInterface extends Library {
       public static boolean isDisconnected(); //Mirror of C# method signature, but wont work
       public boolean isDisconnected(); //best fit, but throws exception "Error looking up function 'isDisconnected': The specified procedure could not be found."
   }

   public static void main(String[] args) {
       MyInterface anInstance = (MyInterface) Native.loadLibrary("theDLL", MyInterface.class);
       anInstance.isDisconnected();
   }
}

Upvotes: 2

Views: 716

Answers (1)

Joachim Isaksson
Joachim Isaksson

Reputation: 180917

You should be able to use Direct Mapping, something like;

import com.sun.jna.*;

public class MyClass {

    public static native boolean isDisconnected();

    static {
        Native.register("theDLL");
    }

    public static void main(String[] args) {
        MyClass.isDisconnected();
    }
}

Upvotes: 1

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