在Golang中，你如何将切片转换为数组 [英] In Golang how do you convert a slice into an array

问题描述

我是Go的新手，试图编写一个读取RPM文件的应用程序。每个块的开始都有一个魔术字符 [4] byte 。

这是我的结构

 类型Lead struct {
 Magic [4]字节
主要，次要字节
类型uint16 
 Arch uint16 
名称字符串
 OS uint16 
 SigType uint16 
} 
  

我正在尝试以下操作：

  lead：= Lead {} 
 lead.Magic = buffer [0：4] 
  

我在线搜索并不确定如何从切片转到数组（不进行复制）。我总是可以制作魔术 []字节（甚至 uint64 ），但我更加好奇我会如何如果需要，从 [] byte 到 [4] byte >类型转到$

解决方案

内置方法 copy 只会将切片复制到切片而非数组切片。

您必须欺骗 copy 来认为数组是分片的

 复制（varLead.Magic [：]，someSlice [0：4]）
  

或者使用for循环复制：

 索引，b：=范围someSlice {
 
 varLead.Magic [ index] = b 
 
} 
  

或者像zupa所做的那样使用文字。我已添加到他们的工作示例中。

Go Playground

I am new to Go and trying to write an application that reads RPM files. The start of each block has a Magic char of [4]byte.

Here is my struct

type Lead struct {
  Magic        [4]byte
  Major, Minor byte
  Type         uint16
  Arch         uint16
  Name         string
  OS           uint16
  SigType      uint16
}

I am trying to do the following:

lead := Lead{}
lead.Magic = buffer[0:4]

I am searching online and not sure how to go from a slice to an array (without copying). I can always make the Magic []byte (or even uint64), but I was more curious on how would I go from type []byte to [4]byte if needed to?

解决方案

The built in method copy will only copy a slice to a slice NOT a slice to an array.

You must trick copy into thinking the array is a slice

copy(varLead.Magic[:], someSlice[0:4])

Or use a for loop to do the copy:

for index, b := range someSlice {

    varLead.Magic[index] = b

}

Or do as zupa has done using literals. I have added onto their working example.

Go Playground

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