Here are the classes, structs, unions and interfaces with brief descriptions:

CAgoraChatClient
C<AgoraChatClientDelegate>
CAgoraChatCmdMessageBody
CAgoraChatCombineMessageBody
CAgoraChatContact
C<AgoraChatContactManagerDelegate>
CAgoraChatConversation
CAgoraChatConversationFilter
CAgoraChatCursorResult
CAgoraChatCustomMessageBody
CAgoraChatDeviceConfig
CAgoraChatError
CAgoraChatFetchServerMessagesOption
CAgoraChatFileMessageBody
CAgoraChatGroup
C<AgoraChatGroupManagerDelegate>
CAgoraChatGroupMessageAck
CAgoraChatGroupOptions
CAgoraChatGroupSharedFile
CAgoraChatImageMessageBody
C<AgoraChatLocalNotificationDelegate>
CAgoraChatLocalNotificationManager
CAgoraChatLocationMessageBody
C<AgoraChatLogDelegate>
CAgoraChatLoginExtensionInfo
C<AgoraChatManagerDelegate>
CAgoraChatMessage
CAgoraChatMessageBody
CAgoraChatMessagePinInfo
CAgoraChatMessageReaction
CAgoraChatMessageReactionChange
CAgoraChatMessageReactionOperation
CAgoraChatMessageStatistics
C<AgoraChatMultiDevicesDelegate>
CAgoraChatOptions
CAgoraChatOptions(PrivateDeploy)
CAgoraChatPageResult
CAgoraChatPresence
C<AgoraChatPresenceManagerDelegate>
CAgoraChatPresenceStatusDetail
CAgoraChatPushOptions
CAgoraChatRecallMessageInfo
CAgoraChatroom
C<AgoraChatroomManagerDelegate>
CAgoraChatroomOptions
CAgoraChatSilentModeParam
CAgoraChatSilentModeResult
CAgoraChatSilentModeTime
CAgoraChatTextMessageBody
CAgoraChatThread
CAgoraChatThreadEvent
C<AgoraChatThreadManagerDelegate>
CAgoraChatTranslateLanguage
CAgoraChatTranslationResult
CAgoraChatUserInfo
CAgoraChatVideoMessageBody
CAgoraChatVoiceMessageBody
C<IAgoraChatContactManager>
C<IAgoraChatGroupManager>
C<IAgoraChatManager>
C<IAgoraChatPresenceManager>
C<IAgoraChatPushManager>
C<IAgoraChatroomManager>
C<IAgoraChatStatisticsManager>
C<IAgoraChatThreadManager>
C<IAgoraChatTranslateManager>
C<IAgoraChatUserInfoManager>
CNSObject(Coding)