addEras method
Implementation
void addEras(int eras) {
final hr = ptr.ref.vtable
.elementAt(24)
.cast<Pointer<NativeFunction<HRESULT Function(Pointer, Int32 eras)>>>()
.value
.asFunction<int Function(Pointer, int eras)>()(ptr.ref.lpVtbl, eras);
if (FAILED(hr)) throw WindowsException(hr);
}