int vortex_xml_rpc_method_call_get_msgno ( XmlRpcMethodCall method_call  ) 

Allows to get the message number, unique identifier inside the channel, where the xml-rpc method call was received.

method_call The method call that is required to returns is msg-no value.
Current msg-no value or undefined if the method call wasn't sent (the value is updated once the XmlRpcMethodCall is used to perform an invocation: vortex_xml_rpc_invoke and vortex_xml_rpc_invoke_sync).