Golang-无法在[]界面{}中访问地图

Question

I have used json.Unmarshal and extracted json content. I then managed to get one layer deeper into the []interface{} by using the following code:

        response, err := http.Get("http://api.steampowered.com/ISteamUser/GetPlayerSummaries/v0002/?key=2B2A0C37AC20B5DC2234E579A2ABB11C&steamids=76561198132612090")
        content, err := ioutil.ReadAll(response.Body)
        defer response.Body.Close()
        if err != nil {
            panic(0)
        }

        var decoded map[string]interface{}
        if err := json.Unmarshal(content, &decoded); err != nil {
            panic(0)
        }

        players := decoded["response"].(map[string]interface{})["players"]
        if err != nil {
            panic(0)
        }

Variable players' type is []interface {} and content is [map[personaname:Acidic]].

How do I access this map? I've tried players["personaname"] but that doesn't seem to work. Any ideas?

Answer 1

Players is a JSON array. Thus you have to convert it to a slice of interface.

Then you can access any element of the slice and casting it to a map[string]interface{} type.

Here's the working example

package main

import (
    "encoding/json"
    "fmt"
    "io/ioutil"
    "net/http"
)

func main() {
    response, err := http.Get("http://api.steampowered.com/ISteamUser/GetPlayerSummaries/v0002/?key=2B2A0C37AC20B5DC2234E579A2ABB11C&steamids=76561198132612090")
    content, err := ioutil.ReadAll(response.Body)
    defer response.Body.Close()
    if err != nil {
        panic(0)
    }

    var decoded map[string]interface{}
    if err := json.Unmarshal(content, &decoded); err != nil {
        panic(0)
    }

    players := decoded["response"].(map[string]interface{})["players"]
    if err != nil {
        panic(0)
    }

    sliceOfPlayers := players.([]interface{})
    fmt.Println((sliceOfPlayers[0].(map[string]interface{}))["personaname"])
}