Magento Get arg_name in observer -

i can set observer listen when 1 of controller method tigger, however, want pass parameter observer, how can parameter in observer? arg_value

thanks lot

<events> <controller_action_predispatch_mycompany_mymodule_controllername_recalculation> <observers> <mycompany_mymodule> <class>mycompany_mymodule_model_observer</class> <method>processgo</method> <args> <arg_name>arg_value</arg_name> </args> </mycompany_mymodule> </observers> </controller_action_predispatch_mycompany_mymodule_controllername_recalculation> </events> 

please try following

<events>      <event_to_observe>          <observers>              <observer_name>                  <type>singleton</type>                  <class>namespace_module_model_observerclass</class>                  <method>observermethod</method>                    <args>                      <arg_name>arg_value</arg_name>                  </args>                </observer_name>          </observers>      </event_to_observe>  </events>

<?php  /**   * observer class   */    class namespace_module_model_observerclass {        /**       * observer method       *        * @param varien_event_observer $observer       * @return void       */      public function observermethod(varien_event_observer $observer) {            $args = mage::helper('ecmessenger')->getobserverargs($observer, get_class($this), __function__);          mage::log($args, null, 'observer.log');      }  }

make sure here mage::helper('ecmessenger') helper need create , specify in config.xml

let me know if have query