我刚开始玩Go-lang,遇到了Structs的奇怪行为。我有一个Struct A
和另一个Struct B
,在Struct B
中,一个键定义为[]A
,问题是分配新实例类型{{1} }作为B
的元素,尽管类型相同,但仍会引发错误。任何帮助将不胜感激
在下面,我粘贴了导致错误的最小代码
A
编辑:该错误正在运行时
意外的换行符,期望逗号或}
并且警告编辑器显示在IDE上
不能将partitionsList(类型PARTITIONSLIST)用作[] PARTITIONS
答案 0 :(得分:1)
考虑,阅读this并更改命名方式,
花时间决定什么是专有名称。
您两次声明PARITIONLIST
type PARTITIONLIST []PARTITION //17th line, remove this
PARTITIONS
被定义为
type PARTITIONS struct {
Name string
List []PARTITION
}
您可以在PARTITIONLIST
字段中使用[]PARTITION
而不是List
类型。
结构变量字段值以逗号结尾,
var partitionDetails = PARTITIONS{
"partitions",
partitionsList,
}
答案 1 :(得分:1)
该错误清楚地表明:
不能将partitionsList(类型PARTITIONSLIST)用作[] PARTITIONS
您在结构中存在类型不匹配问题。由于PARTITIONSLIST不适合[] PARTITIONS。因此,如果您创建这两种类型的变量,则它们是不同的。
type PARTITIONLIST []PARTITION
type PARTITIONS struct {
Name string
List []PARTITIONS // here the list is slice of Partitions.
}
在创建PARTITIONLIST类型的切片时。
var partitionsList PARTITIONLIST // this is a variable of PARTITIONLIST type which is not equal to `[]PARTITIONS`
这是因为golang是严格键入的语言。因此,即使两个值的基础类型相似。仍然不同。为了更简单,请尝试以下示例:
package main
import "fmt"
type MyInt int
func main() {
var a int = 2
var b MyInt = 2
fmt.Println(a==b)
}
输出:
无效操作:a == b(类型不匹配的int和MyInt)
因此,您需要创建[]PARTITIONS
的一部分,作为:
var partitionsList `[]PARTITIONS`
或者您可以创建两个PARTITIONLIST
类型的变量以使其相似。
另一个错误:
意外的换行符,期望逗号或}
是因为如果在新行中使用,
,则需要在最后一个字段之后传递:
var partitionDetails = PARTITIONS{
"partitions",
partitionsList, // pass comma here in your code.
}
完整的示例:
package main
import (
"fmt"
"math"
"strconv"
"github.com/shirou/gopsutil/disk"
)
func main() {
/************ disk details goes here ************/
diskPartitions, err := disk.Partitions(true)
dealwithErr(err)
fmt.Println(diskPartitions)
var partitionsList PARTITIONLIST
for partitionIndex, partition := range diskPartitions {
partitionStat, err := disk.Usage(partition.Mountpoint)
dealwithErr(err)
var partitionDetails = PARTITION{
"PARTITION",
partitionIndex,
partition.Mountpoint,
"" + fmt.Sprint(partitionStat.Total) + " and " + bytesToSize(partitionStat.Total),
"" + fmt.Sprint(partitionStat.Used) + " and " + bytesToSize(partitionStat.Used),
"" + fmt.Sprint(partitionStat.Free) + " and " + bytesToSize(partitionStat.Free),
"" + fmt.Sprint(partitionStat.UsedPercent) + "and " + strconv.FormatFloat(partitionStat.UsedPercent, 'f', 2, 64),
}
partitionsList = append(partitionsList, partitionDetails)
}
//till here working fine
fmt.Println(partitionsList)
//THE BELOW TWO LINES ERROR IS THE ACTUAL ERROR I AM ASKING
var partitionDetails = PARTITIONS{
"partitions",
partitionsList,
}
fmt.Println(partitionDetails)
dealwithErr(err)
}
/************ all struct goes here ************/
type PARTITION struct {
Name string
Partition_index int
Partition string
Total_space_in_bytes string
Used_space_in_bytes string
Free_space_in_bytes string
Percentage_space_usage string
}
type PARTITIONLIST []PARTITION
type PARTITIONS struct {
Name string
List PARTITIONLIST
}
/************ helper functions goes below here ************/
func bytesToSize(bytes uint64) string {
sizes := []string{"Bytes", "KB", "MB", "GB", "TB"}
if bytes == 0 {
return fmt.Sprint(float64(0), "bytes")
} else {
var bytes1 = float64(bytes)
var i = math.Floor(math.Log(bytes1) / math.Log(1024))
var count = bytes1 / math.Pow(1024, i)
var j = int(i)
var val = fmt.Sprintf("%.1f", count)
return fmt.Sprint(val, sizes[j])
}
}
func dealwithErr(err error) {
if err != nil {
fmt.Println(err)
}
}