golang 如何用反射reflect操作结构体

package model
type Person struct {
 Name string
 age  int
}
func NewPerson(name string, age int) *Person {
 return &Person{
  Name: name,
  age:  age,
 }
}

package main
import (
	"GitHub.com/miaomiao3/log"
	"../model"
	"reflect"
	"unsafe"
)
func main() {
	person := model.NewPerson("haha", 12)
	log.Debug("before:%+v", person)
	simpleStrtuctField(person)
	simpleStrtuctField(person)
	log.Debug("after:%+v", person)
}
// get unexported field
func simpleStrtuctField(v interface{}) {
	dataType := reflect.TypeOf(v)
	dataValue := reflect.ValueOf(v)
	if dataType.Kind() == reflect.Ptr {
		if dataValue.IsNil() {
			panic("nil ptr")
		}
		// 如果是指针，则要判断一下是否为struct
		originType := reflect.ValueOf(v).Elem().Type()
		if originType.Kind() != reflect.Struct {
			return
		}
		// 解引用
		dataValue = dataValue.Elem()
		dataType = dataType.Elem()
	} else {
		panic("non ptr")
	}
	num := dataType.NumField()
	for i := 0; i < num; i++ {
		field := dataType.Field(i)
		fieldName := field.Name
		fieldValue := dataValue.FieldByName(fieldName)
		if !fieldValue.IsValid() {
			continue
		}
		if fieldValue.CanInterface() {
			log.Debug("exported fieldName:%v value:%v", fieldName, fieldValue.Interface())
			if fieldValue.CanSet() && fieldValue.Kind() == reflect.String {
				oldValue := fieldValue.Interface().(string)
				fieldValue.SetString(oldValue + " auto append")
			}
		} else {
			// 强行取址
			forceValue := reflect.NewAt(fieldValue.Type(), unsafe.Pointer(fieldValue.UnsafeAddr())).Elem()
			log.Debug("unexported fieldName:%v value:%v", fieldName, forceValue.Interface())
		}
	}
}

package main
import (
	"fmt"
	"reflect"
	"testing"
)
type Call struct {
	Num1 int
	Num2 int
}
func (call Call) GetSub(name string){
	fmt.Printf("%v 完成了减法运算，%v - %v = %v \n", name, call.Num1, call.Num2, call.Num1 - call.Num2)
}
func (call *Call) GetSum(name string){
	fmt.Printf("%v 完成了加法运算，%v + %v = %v \n", name, call.Num1, call.Num2, call.Num1 + call.Num2)
}
func TestReflect(t *testing.T) {
	var (
		call *Call
		rValues []reflect.Value
		rValues2 []reflect.Value
	)
	ptrType := reflect.TypeOf(call) //获取call的指针的reflect.Type
	trueType := ptrType.Elem() //获取type的真实类型
	ptrValue := reflect.New(trueType) //返回对象的指针对应的reflect.Value
	call = ptrValue.Interface().(*Call)
	trueValue := ptrValue.Elem() //获取真实的结构体类型
	trueValue.FieldByName("Num1").SetInt(123)//设置对象属性，注意这个一定要是真实的结构类型的reflect.Value才能调用,指针类型reflect.Value的会报错
	//ptrValue.FieldByName("Num2").SetInt(23)
	trueValue.FieldByName("Num2").SetInt(23)
	//rValues = make([]reflect.Value, 0)
	rValues = append(rValues, reflect.ValueOf("xiaopeng"))//调用对应的方法
	fmt.Println(rValues)
	trueValue.MethodByName("GetSub").Call(rValues)
	
	//ptrValue.MethodByName("GetSub").Call(rValues)
	//trueValue.MethodByName("GetSum").Call(append(rValues2, reflect.ValueOf("hiram")))
	ptrValue.MethodByName("GetSum").Call(append(rValues2, reflect.ValueOf("hiram")))
	fmt.Println(call)
	
	
	call.GetSub("aaa")
	(*call).GetSub("bbb")
	call.GetSum("ccc")
	(*call).GetSum("DDD")
}