how to call methods from a dll from c++?

how to call methods from a c# dll in java?

• I've created a c# dll in visual studio 2008 the content of the c# dll is as given below: using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace hello { public class Class1 { public static double addUp(double number, double Number) { return number + Number; } public static double minus(double number, double Number) { return number - Number; } } } and through java i've loaded the hello.dll using System.loadLibrary("hello"); The java code is as given below: package pkgnew; import javax.swing.JOptionPane; public class check { public static native double addUp(double number,double Number); static { try { System.loadLibrary("hello"); System.out.println("SUCCESS"); }catch(Exception ex){ JOptionPane.showMessageDialog(null,"Required DLLs Not Found\n"+ex.getCause(),"Error Loading Libraries", JOptionPane.ERROR_MESSAGE);} } public static void main(String[] args) { new check().getval(); } public void getval() { try { double g=this.addUp(52.2, 51.3); }catch(Exception y){System.out.println("ERROR IS:"+y);} } } but the problem is that i'm getting output as: OUTPUT SUCCESS Exception in thread "main" java.lang.UnsatisfiedLinkError: pkgnew.check.addUp(DD)D at pkgnew.check.addUp(Native Method) at pkgnew.check.getval(check.java:35) at pkgnew.check.main(check.java:29) Java Result: 1 Can anyone tell me why i'm getting this error....and why i'm not able to call the dll methods

• Answer:

  I don't think you can call native extensions in Java without using JNI wrappers (or at least some library which translates to JNI under the hood). Have you tried out the frameworks/suggestions mentioned in http://stackoverflow.com/questions/50398/calling-c-sharp-code-from-java?