GoLang - 填充结构数组 [英] GoLang - Populate Array of Structure

问题描述

我有以下2个结构

  type AAAA struct {
 Aa [2] byte 
 Ab [2]字节
 Ac [3]字节
} 
类型BBBB结构{
 Ba [4]字节
 Bb [2]字节
 Bc [3]字节
 Bd [2]字节//结构AAA项目的数目
 BBStr [] AAAA 
} 
  

因此Struct BBB在Struct AAA中重复

然后我有一个字符串，它的输入包含结构作为输入

输入：=aaaabbccc02ddeefffddeefff（这里02是结构BBBB中Struct A AAAA重复的时间）

我需要读取输入字符串并填充结构BBBB，包括结构体数组AAA

我写了下面的函数来实现这个功能。但我得到了错误 - 二进制。阅读：无效类型* main.BBBB

需要帮助，以确定为什么会出现此错误？也有办法做到这一点不同？
$ b $ pre $ func main（）{
input：=aaaabbccc02ddeefffddeefff
var k BBBB
变量j AAAA
k.BBStr =追加（k.BBStr，j）
k.BBStr =追加（k.BBStr，j）
xyz：= []字节（输入）
err：= binary.Read（bytes.NewReader（xyz），binary.LittleEndian，& k）
如果err！= nil {
fmt.Println（Bad error - ，err ）
}
fmt.Println（Structure Definition - ，k）
}


解决方案

https： //golang.org/pkg/encoding/binary/#Read 表示：

数据必须是指向固定 - 大小的价值或一块固定d


$ b

这意味着您的 Read 类型的大小>必须在编译时知道。你的 struct BBBB 包含一片 [] AAAA ，这意味着它的长度只在运行时才被知道。如果你使它成为一个固定大小的数组，例如 [16] AAAA ，它可以工作。

I have the following 2 structures

     type AAAA struct{
        Aa  [2]byte
        Ab  [2]byte
        Ac  [3]byte
    }       
    type BBBB struct{
        Ba  [4]byte
        Bb  [2]byte
        Bc  [3]byte
        Bd  [2]byte   // No Of Struct AAA Items
        BBStr  []AAAA
    }

So Struct BBB is repeating in Struct AAA

Then I have a string that I have as input which contains the value of the structure coming as input

input := "aaaabbccc02ddeefffddeefff" (here 02 is no of time Struct AAAA repeats in Struct BBBB)

I need to read through the input string and populate the structure BBBB including the array of structure AAA

I wrote the function below to achieve this. But I am getting " Bad error - binary.Read: invalid type *main.BBBB

Need Help in identifying why this error? Also is there a way to do this differently?

    func main() {
        input := "aaaabbccc02ddeefffddeefff"
        var k BBBB
        var j AAAA
        k.BBStr = append(k.BBStr,j)
        k.BBStr = append(k.BBStr,j)
        xyz := []byte(input)
        err := binary.Read(bytes.NewReader(xyz), binary.LittleEndian, &k)
        if err != nil {
            fmt.Println("Bad error - ",err)
        }
        fmt.Println("Structure Definition - ",k)
    }

解决方案

The documentation at https://golang.org/pkg/encoding/binary/#Read says:

Data must be a pointer to a fixed-size value or a slice of fixed-size values.

which means that the size of the type you Read must be known at compile time. Your struct BBBB contains a slice of []AAAA which means its length is known only at run-time. If you make it a fixed-size array, e.g. [16]AAAA, it would work.

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