Method updateStructureByReference

src/com/sun/jna/Structure.java:695–716

Only keep the original structure if its native address is unchanged. Otherwise replace it with a new object. @param type Structure subclass @param s Original Structure object @param address the native struct @return Updated Structure.ByReference object

(Class<T> type, T s, Pointer address)

     * @return Updated <code>Structure.ByReference</code> object
     */
    static <T extends Structure> T updateStructureByReference(Class<T> type, T s, Pointer address) {
        if (address == null) {
            s = null;
        }
        else {
            if (s == null || !address.equals(s.getPointer())) {
                Structure s1 = reading().get(address);
                if (s1 != null && type.equals(s1.getClass())) {
                    s = (T) s1;
                    s.autoRead();
                }
                else {
                    s = newInstance(type, address);
                    s.conditionalAutoRead();
                }
            }
            else {
                s.autoRead();
            }
        }
        return s;
    }

    /** Read the given field and return its value.  The Java field will be
     * updated from the contents of native memory.