GetWindowLongPtrW method
Implementation
int GetWindowLongPtrW(
  ffi.Pointer<HWND__> hWnd,
  int nIndex,
) {
  return (_GetWindowLongPtrW ??=
      _dylib.lookupFunction<_c_GetWindowLongPtrW, _dart_GetWindowLongPtrW>(
          'GetWindowLongPtrW'))(
    hWnd,
    nIndex,
  );
}