/**
  * 
  * @param Config $config
  * @return string
  */
 public function getDefaultPadlockLoginImagePathByConfig($config)
 {
     $lockpadImage = $config->LockpadImageNeedLogIn();
     if ($lockpadImage && $lockpadImage->exists()) {
         return $relativePath = $lockpadImage->Filename;
     }
 }
 /**
  * 
  * @param Config $config
  * @return string
  */
 public function getDefaultPadlockLoginImagePathByConfig($config)
 {
     if (!$this->_need_login_image) {
         $lockpadImage = $config->LockpadImageNeedLogIn();
         if ($lockpadImage && $lockpadImage->exists()) {
             $this->_need_login_image = $lockpadImage->Filename;
             return $this->_need_login_image;
         }
     } else {
         return $this->_need_login_image;
     }
 }