native的使用始终报错?

Question

native的使用始终报错

org.xvolks.jnative.exceptions.NativeException: Function add not found
at org.xvolks.jnative.JNative.nLoadLibrary(Native Method)
at org.xvolks.jnative.JNative.<init>(JNative.java:348)
at org.xvolks.jnative.JNative.<init>(JNative.java:269)
at NewTest.main(NewTest.java:13)
JNativeCpp.dll放在对应的位置了，可以确定的是调用的库中存在该函数，请高手指教

附代码：
import org.xvolks.jnative.JNative;
import org.xvolks.jnative.Type;
import org.xvolks.jnative.exceptions.NativeException;

public class NewTest 
{ 
public static void main(String[] args) throws NativeException, IllegalAccessException
{
JNative n = null;
try
{
//System.loadLibrary("jnative");
n = new JNative("jnative.dll", "add");
n.setRetVal(Type.INT); 
n.setParameter(0 ,1) ; 
n.setParameter(1, 2); 
n.invoke();
System.out.println(n.getDLLName());
}
catch(Exception e)
{
e.printStackTrace();
}
finally
{
if(n!=null)
n.dispose();
}
}
}