code: func (v *FileChooser) GetFilenames() (*glib.SList, error) {
  	c := C.gtk_file_chooser_get_filenames(v.native())
  	if c == nil {
  		return nil, nilPtrErr
  	}
  	return glib.WrapSList(uintptr(unsafe.Pointer(c))), nil
  }
docs: // GetFilenames is a wrapper around gtk_file_chooser_get_filenames().