成员的完整列表，这些成员属于 NEMeetingMessageChannelService,包括所有继承而来的类成员

addMeetingMessageChannelListener(NEMeetingMessageChannelListener *listener)=0	NEMeetingMessageChannelService	pure virtual
clearUnreadCount(const std::string &sessionId, const NEEmptyCallback &callback)=0	NEMeetingMessageChannelService	pure virtual
deleteAllSessionMessage(const std::string &sessionId, const NEEmptyCallback &callback)=0	NEMeetingMessageChannelService	pure virtual
getSessionMessagesHistory(const NEMeetingGetMessageHistoryParams &param, const NEMessagesCallback &callback)=0	NEMeetingMessageChannelService	pure virtual
NEMessagesCallback typedef	NEMeetingMessageChannelService
NEObject()=default	NEObject
NEService()	NEService	inline
queryUnreadMessageList(const std::string &sessionId, const NEMessagesCallback &callback)=0	NEMeetingMessageChannelService	pure virtual
removeMeetingMessageChannelListener(NEMeetingMessageChannelListener *listener)=0	NEMeetingMessageChannelService	pure virtual
~NEObject()=default	NEObject	virtual
~NEService()	NEService	inlinevirtual