Use callback_before_delete:
...
$crud->callback_before_delete(array($this,'callback_before_delete_slide'));
...
function callback_before_delete_slide($primary_key)
{
$this->db->where('id_slide',$primary_key);
$query = $this->db->get('tbl_slide');
$row = $query->row();
unlink("./assets/uploads/files/picture/slide/$row->picture");
}
Done, I hope it can be useful for us...
