Question

在有索引的特定数据的情况下，使用indexedseq在scala中迭代和提取数据的最佳方法是什么

val data
=IndexedSeq(0x00,0x0F,0x33,0x35,0x35,0x35,0x36,0x35,0x30,0x37,0x31,0x33,0x30,0x38,0x31,0x30,0x33,0x43,0x4D,0x54,0x4D,0x31,0x2E,0x30,0x30,0x32)

设备发送长度为14个字节的连接命令。

00 0F 33 35 35   35 36 35 30 37 31 33 30 38 31 30 33 43 4D 54 4D 31 2E 30 30 32

页眉2字节设备ID 16字节固件版本8字节

我在下面尝试过手动检查每个索引

if(data(0)==0x00 && data(1)==0x0F){
  //New Connection

  val deviceId=(data.slice(2,17).map(_.toChar)).mkString
  val firmwareVersion=(data.slice(18,25).map(_.toChar)).mkString

  println(deviceId)
  println(firmwareVersion)
}

Answer 1

您可以使用模式匹配：

val data = Seq(0x00,0x0F,0x33,0x35,0x35,0x35,0x36,0x35,0x30,0x37,0x31,0x33,0x30,0x38,0x31,0x30,0x33,0x43,0x4D,0x54,0x4D,0x31,0x2E,0x30,0x30,0x32)

data match {
  case 0x00::0x0F::xs => 
    val deviceId=(xs.take(15).map(_.toChar)).mkString
    val firmwareVersion=(data.slice(18,25).map(_.toChar)).mkString
    println(deviceId)
    println(firmwareVersion)
  case other => // handle unexpected data
}

在Scala中对IndexedSeq进行迭代和提取数据的最佳方法

1 个答案: