OfflineGroupImage

data class OfflineGroupImage : GroupImage, OfflineImage

通过 Group.uploadImage 上传得到的 GroupImage. 它的链接需要查询 Bot.queryImageUrl

imageId - 参考 Image.imageId

通过 Group.uploadImage 上传得到的 GroupImage. 它的链接需要查询 Bot.queryImageUrl

OfflineGroupImage(imageId: String)

val imageId: String

md5	`val Image.md5: ByteArray`

flatten	扁平化 Message `fun Message.flatten(): Sequence<SingleMessage>`
isContentEmpty	判断消息内容是否为空. `fun Message.isContentEmpty(): Boolean`
isContentNotEmpty	`fun Message.isContentNotEmpty(): Boolean`
isNotPlain	`fun Message.isNotPlain(): Boolean`
isNotPlain2	`fun Message.isNotPlain2(): Boolean`
isPlain	`fun Message.isPlain(): Boolean`
isPlain2	`fun Message.isPlain2(): Boolean`
repeat	`fun Message.repeat(count: Int): MessageChain`
repeat2	`fun Message.repeat2(count: Int): MessageChain`
sendTo	`suspend fun <C : Contact> Message.sendTo(contact: C): MessageReceipt<C>`
times	`operator fun Message.times(count: Int): MessageChain`
toForwardMessage	转换为 ForwardMessage `fun Message.toForwardMessage(sender: User, time: Int = currentTimeSeconds.toInt(), displayStrategy: DisplayStrategy = DisplayStrategy): ForwardMessage` `fun Message.toForwardMessage(senderId: Long, senderName: String, time: Int = currentTimeSeconds.toInt(), displayStrategy: DisplayStrategy = DisplayStrategy): ForwardMessage`