Question

package main

import (
    "fmt"
    "reflect"
)

type Blog struct {
    Name string
}

func (blog *Blog) Test() (*Blog){
    fmt.Println("this is Test method")
    blog.Name = "robin"
    return blog
}

func main() {
    var o interface{} = &Blog{}
    v := reflect.ValueOf(o)
    m := v.MethodByName("Test")
    rets := m.Call([]reflect.Value{})
    fmt.Println(rets)
}

我得到了以下输出：

这是测试方法
[]

为什么没有博客结构以及如何获取博客名称的价值？

Answer 1

package main

import (
    "fmt"
    "reflect"
)

type Blog struct {
    Name string
}

func (blog *Blog) Test() *Blog {
    fmt.Println("this is Test method")
    blog.Name = "robin"
    return blog
}

func main() {
    rv := reflect.ValueOf(&Blog{})
    rm := rv.MethodByName("Test")

    results := rm.Call(nil)
    fmt.Printf("%#v\n", results)

    blogPointer := results[0]
    fmt.Printf("%#v\n", blogPointer)

    blogValue := blogPointer.Elem()
    fmt.Printf("%#v\n", blogValue)

    nameFieldValue := blogValue.FieldByName("Name")
    fmt.Printf("%#v\n", nameFieldValue)

    name := nameFieldValue.String()
    fmt.Println(name)
}

https://play.golang.org/p/iyUw-Sp97-

Answer 2

首先我们调用接口返回的函数，然后我们可以使用Elem（）方法调用它的值来调用指向接口的指针

String[] extensions = { "*.bmp", "*.png", "*.jpg", "*.jpeg", "*.tiff", "*.ico", "*.gif" };
List<String> images = new List<String>();
foreach (String ext in extensions)
{
    try
    {
        images = images.Concat(Directory.GetFiles(path, ext)).ToList();
    }
    catch { }
}
ObservableCollection<ImageBlock> ImageCollection = new ObservableCollection<ImageBlock>();
foreach (String img in images)
    this.ImageList.Items.Add(new ImageBlock(img, System.IO.Path.GetFileName(img)));

reflect如何获取返回的结构指针

2 个答案: