修改变量的值

 

 

修改变量的值

package main
 main

import (
    "fmt"
    "os"
    "reflect"
)

func main() {
    x := 2
    a := reflect.ValueOf(&x)
    d := a.Elem()

    px1 := d.Addr()
    px2 := px1.Interface()
    px := px2.(*int)
    *px = 3

    fmt.Println("----test addr interface-----")
    fmt.Printf("a:%T,%v\n", a, a)
    fmt.Printf("d:%T,%v\n", d, d)
    fmt.Printf("px1:%T,%v\n", px1, px1)
    fmt.Printf("px2:%T,%v\n", px2, px2)
    fmt.Printf("x:%T,%v\n", x, x)

    fmt.Println("------test Set-------")
    d.Set(reflect.ValueOf(4))
    fmt.Printf("x:%T,%v\n", x, x)

    fmt.Println("----test stdout----")
    stdout := reflect.ValueOf(os.Stdout).Elem()
    fmt.Println(stdout.Type())

    //fd := stdout.FieldByName("name")
    //fmt.Println(fd.Int())
    name := stdout.FieldByName("name")
    fmt.Println(name.String())
    fmt.Println(name.CanAddr(), name.CanSet())
}

 

运行结果：

----test addr interface-----

a:reflect.Value,0x10e220ac

d:reflect.Value,3

px1:reflect.Value,0x10e220ac

px2:*int,0x10e220ac

x:int,3

------test Set-------

x:int,4

----test stdout----

os.File

/dev/stdout

true false

成功: 进程退出代码 0.