java JNative调用DLL中带引用类型的方法

DLL中的被调函数有两个参数，第二个参数是int64类型的引用类型，因此创建8byte的MemoryBlock；

JNative n = null;
  try {
   n = new JNative("AAAA.dll", "sss");
   n.setRetVal(Type.VOID);
   int i = 0;
   n.setParameter(i++, Type.INT, level);
   Pointer pp = new Pointer(MemoryBlockFactory.createMemoryBlock(8));
   n.setParameter(i++, pp);
   System.out.println(pp.getAsLong(0));
   n.invoke();
   System.out.println(pp.getAsLong(0));
   return 0;
  } finally {
   if (n != null)
    JNative.unLoadLibrary("GeoSOT32.dll");
  }