Get name of struct field using reflection

I think the better way to get the fields' name in the struct is

func main() {a := &A{Foo: "afoo"}val := reflect.ValueOf(a).Elem()for i:=0; i<val.NumField();i++{fmt.Println(val.Type().Field(i).Name)}}

There are two tips:

1. use .Elem() after you reflect.ValueOf(a), because in your case, a is a pointer.
2. val.Field(i).Type().Name is totally different from val.Type().Field(i).Name. The latter one can get the name of the field in the struct

Hope that it is helpful..

If you want to have a look at more cases, please check my 2mins article

You need to Get the Field of the Type Definition not of the Value.

http://play.golang.org/p/7Bc7MJikbJ

package mainimport "fmt"import "reflect"type A struct {Foo string}func (a *A) PrintFoo() {fmt.Println("Foo value is " + a.Foo)}func main() {a := &A{Foo: "afoo"}val := reflect.Indirect(reflect.ValueOf(a))fmt.Println(val.Type().Field(0).Name)}

Note that this solution references a Go module which is now deprecated, and is no longer being maintained. It was deprecated as of Oct 11, 2018.

With the new Names method of the structs package it's even easier:

package mainimport ("fmt""github.com/fatih/structs")type A struct {Foo stringBar int}func main() {names := structs.Names(&A{})fmt.Println(names) // ["Foo", "Bar"]}

package mainimport "fmt"import "reflect"type A struct {Foo string}func (a *A) PrintFoo() {fmt.Println("Foo value is " + a.Foo)}func main() {a := &A{Foo: "afoo"}//long and bored codet := reflect.TypeOf(*a)if t.Kind() == reflect.Struct {for i := 0; i < t.NumField(); i++ {fmt.Println(t.Field(i).Name)}} else {fmt.Println("not a stuct")}//shorthanded callfmt.Println(reflect.TypeOf(*a).Field(0).Name)//can panic if no field exists}

You can use this function, which takes the struct as the first parameter, and then its fields. It returns the map type, which is convenient to use

If you use fields from another structure, nothing will happen

If you try to use a different type, it will cause panic

Note that the field has an ordinal number according to the list (starting from 0). All fields in the structure must start with uppercase

func GetStructFieldName(Struct interface{}, StructField ...interface{}) (fields map[int]string) {fields = make(map[int]string)s := reflect.ValueOf(Struct).Elem()for r := range StructField {f := reflect.ValueOf(StructField[r]).Elem()for i := 0; i < s.NumField(); i++ {valueField := s.Field(i)if valueField.Addr().Interface() == f.Addr().Interface() {fields[i] = s.Type().Field(i).Name}}}return fields}

Full example and playground

package mainimport ("fmt""reflect")type Example struct {Apple boolPear int}func GetStructFieldName(Struct interface{}, StructField ...interface{}) (fields map[int]string) {fields = make(map[int]string)for r := range StructField {s := reflect.ValueOf(Struct).Elem()f := reflect.ValueOf(StructField[r]).Elem()for i := 0; i < s.NumField(); i++ {valueField := s.Field(i)if valueField.Addr().Interface() == f.Addr().Interface() {fields[i] = s.Type().Field(i).Name}}}return fields}func main() {e := Example{}names := GetStructFieldName(&e, &e.Apple, &e.Pear)fmt.Println(names)fmt.Println(names[0], names[1])for i := range names {fmt.Println(names[i])}/* Output:map[0:Apple 1:Pear]Apple PearApplePear*/}

You can also use https://github.com/fatih/structs

// Convert the fields of a struct to a []*Fieldfields := s.Fields()for _, f := range fields {fmt.Printf("field name: %+v\n", f.Name())}