英文:
How can i know the length of struct in golang?
问题
我是你的中文翻译助手，以下是你要翻译的内容：
我是Go语言的新手，我正在尝试从一个结构体中获取多个属性。例如：
type Client struct {
name string //1
lastName string //2
age uint //3
}
func main() {
client := Client{name: "Facundo", lastName: "Veronelli", age: 23}
fmt.Println(client.getLengthAttributes()) //它将打印出"3"
}
请注意，代码中的 fmt.println 应该是 fmt.Println。
英文:
I am new to Golang and I am trying to get a number of attributes from a structure
For example:
type Client struct{
name string//1
lastName string//2
age uint//3
}
func main(){
client := Client{name:"Facundo",lastName:"Veronelli",age:23}
fmt.println(client.getLengthAttibutes())//It would print "3"
}
答案1
得分: 4
使用reflect包的ValueOf()函数返回一个value结构体。这个结构体有一个名为NumFields的方法，用于返回字段的数量。
import (
"fmt"
"reflect"
)
type Client struct{
name string//1
lastName string//2
age uint//3
}
func main(){
client := Client{name:"Facundo",lastName:"Veronelli",age:23}
v := reflect.ValueOf(client)
fmt.Printf("结构体有 %d 个字段", v.NumField())
}
英文:
Using the reflect package's ValueOf() function returns a value struct. This has a method called NumFields that returns the number of fields.
import (
"fmt"
"reflect"
)
type Client struct{
name string//1
lastName string//2
age uint//3
}
func main(){
client := Client{name:"Facundo",lastName:"Veronelli",age:23}
v := reflect.ValueOf(client)
fmt.Printf("Struct has %d fields", v.NumField())
}
答案2
得分: 1
你可以使用reflect包来实现这个功能：
import (
"fmt"
"reflect"
)
type Client struct {
name string //1
lastName string //2
age uint //3
}
func main() {
client := Client{name: "Facundo", lastName: "Veronelli", age: 23}
fmt.Println(reflect.TypeOf(client).NumField())
}
然而，这并不是结构体的大小，而只是字段的数量。使用reflect.TypeOf(client).Size()可以得到结构体在内存中占用的字节数。
英文:
You can use the reflect package for this:
import (
"fmt"
"reflect"
)
type Client struct {
name string //1
lastName string //2
age uint //3
}
func main() {
client := Client{name: "Facundo", lastName: "Veronelli", age: 23}
fmt.Println(reflect.TypeOf(client).NumField())
}
This is not, however, the size of that struct, only the number of fields. Use reflect.TypeOf(client).Size() to get how many bytes the struct occupies in memory.
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