AgoraChatVideoMessageBody 成员列表

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

	displayName	AgoraChatFileMessageBody
	downloadStatus	AgoraChatFileMessageBody
	duration	AgoraChatVideoMessageBody
	fileLength	AgoraChatFileMessageBody
-	initWithData:displayName:	AgoraChatFileMessageBody
-	initWithLocalPath:displayName:	AgoraChatFileMessageBody
	localPath	AgoraChatFileMessageBody
-	NS_UNAVAILABLE (定义于 AgoraChatVideoMessageBody)	AgoraChatVideoMessageBody
	operationTime	AgoraChatMessageBody
	operatorCount	AgoraChatMessageBody
	operatorId	AgoraChatMessageBody
	remotePath	AgoraChatFileMessageBody
	secretKey	AgoraChatFileMessageBody
	thumbnailDownloadStatus	AgoraChatVideoMessageBody
	thumbnailLocalPath	AgoraChatVideoMessageBody
	thumbnailRemotePath	AgoraChatVideoMessageBody
	thumbnailSecretKey	AgoraChatVideoMessageBody
	thumbnailSize	AgoraChatVideoMessageBody
	type	AgoraChatMessageBody