JNA在没有源代码的情况下调用DLL

Question

I have to call a dll method and I don't have the source code from dll, I was reading about JNI and understood that you should have the source to input the JNI library in the code (.h).

My second shoot is JNA, but I am getting the same error, although you don't have to change anything in DLL.

I created two classes to test:

interface:

package icom;

import com.sun.jna.Library;

public interface IConectorT extends Library {
    int StartConector(byte[] conectorStatus, String icomPath);
}

DLL method call:

package icom;

import com.sun.jna.Native;

public class ConectorTJna {

    public static void main(String args[]) {

        IConectorT lib = (IConectorT) Native.loadLibrary("ConectorT", IConectorT.class);
        int teste = lib.StartConector(null, "C:\\ICOM");
        System.out.println("RESULT: " + teste);
    }
}

When I call the lib.StartConector method I get this:

Exception in thread "main" java.lang.UnsatisfiedLinkError: Error looking up function 'StartConector': The specified procedure could not be found. at com.sun.jna.Function.(Function.java:179) at com.sun.jna.NativeLibrary.getFunction(NativeLibrary.java:350) at com.sun.jna.NativeLibrary.getFunction(NativeLibrary.java:330) at com.sun.jna.Library$Handler.invoke(Library.java:203) at $Proxy0.StartConector(Unknown Source) at icom.ConectorTJna.main(ConectorTJna.java:10)

Answer 1

Did you specify path to the library, eg using system property?

Here are the details from "Getting Started with JNA" guide:

Make your target library available to your Java program. There are two ways to do this:

1. The preferred method is to set the jna.library.path system property to the path to your target library. This property is similar to java.library.path , but only applies to libraries loaded by JNA.

2. Change the appropriate library access environment variable before launching the VM. This is PATH on Windows, LD_LIBRARY_PATH on Linux, and DYLD_LIBRARY_PATH on OSX.

Taken from: https://github.com/twall/jna/blob/master/www/GettingStarted.md