How to set parameters for opWebRpc

Hi,

I am trying to use webrpc for realtime C++ on version(Photon-iOS-Sdk_v4-1-0-4)

when I'm try to call webrpc , I am not sure how to pass the parameters as a Dictionary

e.g.
ExitGames::Common::Dictionary dic;
dic.put(L"name", L"test");

loadingBalancingClient.opWebRpc(PHOTON_START_BATTLE, ???);

Any suggestions?
Thanks
Charles