英文:
Receiving zero-initialized object after json.Unmarshal
问题
我似乎无法在Go语言中解析JSON文件。我尝试了很多教程，但我看不出我做错了什么。JSON的格式如下所示：
{"latitude": 34.4048358,"longitude": -119.5313565,"dateTime": "Thu Jun 26 2014 08:36:42 GMT-0700 (PDT)"}
我的主文件如下所示：
package mainimport ("encoding/json""fmt")type Position struct {latitude float64 `json:"latitude"`longitude float64 `json:"longitude"`dateTime string `json:"dateTime"`}func jsonToPosition(jsonData []byte) {position := &Position{}if err := json.Unmarshal(jsonData, position); err != nil {fmt.Println(err)}fmt.Println(position)}func main() {jsonToPosition([]byte(`{"latitude":34.4048358,"longitude":-119.5313565,"dateTime":"Thu Jun 26 2014 08:36:42 GMT-0700 (PDT)"}`))}
当我执行fmt.Println(position)时，我没有收到任何错误信息，只得到了&{0 0 }。
英文:
I can't seem to be able to parse a json file in Go. I've tried a bunch of tutorials, but I can't see what I'm doing wrong. The JSON looks like this.
{"latitude": 34.4048358,"longitude": -119.5313565,"dateTime": "Thu Jun 26 2014 08:36:42 GMT-0700 (PDT)"}
And my main file looks like this.
package mainimport ("encoding/json""fmt")type Position struct {latitude float64 `json:latitude`longitude float64 `json:logitude`dateTime string `json:dateTime`}func jsonToPosition(jsonData []byte) {position := &Position{}if err := json.Unmarshal(jsonData, position); err != nil {fmt.Println(err)}fmt.Println(position)}func main() {jsonToPosition([]byte(`{"latitude":34.4048358,"longitude":-119.5313565,"dateTime":"Thu Jun 26 2014 08:36:42 GMT-0700 (PDT)"}`))}
I don't get an error or anything. I just get &{0 0 } when I do fmt.Println(position).
答案1
得分: 3
这是一个常见的错误：你没有在Position结构体中导出数值，所以json包无法使用它。使用大写字母来命名变量以解决这个问题：
type Position struct {Latitude float64 `json:"latitude"`Longitude float64 `json:"longitude"`DateTime string `json:"dateTime"`}
英文:
This is a common mistake: you did not export values in the Position structure, so the json package was not able to use it. Use a capital letter in the variable name to do so:
type Position struct {Latitude float64 `json:latitude`Longitude float64 `json:logitude`DateTime string `json:dateTime`}
通过集体智慧和协作来改善编程学习和解决问题的方式。致力于成为全球开发者共同参与的知识库，让每个人都能够通过互相帮助和分享经验来进步。
评论