EMImageMessageBody 成员列表

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

	compressionRatio	EMImageMessageBody
	displayName	EMFileMessageBody
	downloadStatus	EMFileMessageBody
	fileLength	EMFileMessageBody
-	initWithData:displayName:	EMFileMessageBody
-	initWithData:thumbnailData:	EMImageMessageBody
-	initWithLocalPath:displayName:	EMFileMessageBody
	localPath	EMFileMessageBody
	operationTime	EMMessageBody
	operatorCount	EMMessageBody
	operatorId	EMMessageBody
	remotePath	EMFileMessageBody
	secretKey	EMFileMessageBody
	size	EMImageMessageBody
	thumbnailDisplayName	EMImageMessageBody
	thumbnailDownloadStatus	EMImageMessageBody
	thumbnailFileLength	EMImageMessageBody
	thumbnailLocalPath	EMImageMessageBody
	thumbnailRemotePath	EMImageMessageBody
	thumbnailSecretKey	EMImageMessageBody
	thumbnailSize	EMImageMessageBody
	type	EMMessageBody