求互一个通过传入结构成员去的该结构成员对应值的问题

网上看到一个算法，但是运行的时候出错，请大咖们帮忙，谢谢

package utils

import ( "errors" "fmt" "reflect" )

func GetStructStringField(input interface{}, key string) (value string, err error) { v, err := getStructField(input, key) if err != nil { return } value, ok := v.(string) if !ok { return value, errors.New("can't convert key'v to string") } return }

func GetStructFloat64Field(input interface{}, key string) (value float64, err error) { v, err := getStructField(input, key) if err != nil { return } value, ok := v.(float64) if !ok { return value, errors.New("can't convert key'v to float64") } return }

func getStructField(input interface{}, key string) (value interface{}, err error) { rv := reflect.ValueOf(input) rt := reflect.TypeOf(input) if rt.Kind() != reflect.Struct { return value, errors.New("input must be struct") }

keyExist := false
for i := 0; i < rt.NumField(); i++ {
    curField := rv.Field(i)
    if rt.Field(i).Name == key {
        switch curField.Kind() {
        case reflect.String, reflect.Int64, reflect.Int32, reflect.Int16, reflect.Int8, reflect.Int, reflect.Float64, reflect.Float32:
            keyExist = true
            value = curField.Interface()//此处出错，改成 value = curField 就可以，直接fmt.Println(value )也可以得到想要的值，但是这么改了以后，这个函数GetStructStringField中的  value, ok := v.(string)   ok是false

        default:
            return value, errors.New("key must be int float or string")
        }
    }
}
if !keyExist {
    return value, errors.New(fmt.Sprintf("key %s not found in %s's field", key, rt))
}
return

}