英文:
Golang accessing elements of Gin.H
问题
尝试使用示例来确定是否可以将其作为发布-订阅功能。我想知道是否可以解析或访问gin.H映射中的元素。我想在POST请求中发送一个JSON。
在route.go的roomPOST()函数中：
...
post := gin.H{
"message": "{\"12345\":\"on\",\"23456\":\"off\"}",
}
...
我希望在streamRoom()函数中对其进行处理：
在route.go的streamRoom()函数中：
...
c.Stream(func(w io.Writer) bool {
select {
case msg := <-listener:
...
fmt.Printf("msg: %s %s\n", reflect.TypeOf(msg), msg)
...
}
输出结果为：
msg: gin.H map[message:{"12345":"on","23456":"off"}]
当尝试访问msg中的元素时，例如：
element := msg["message"].(string)
会抛出以下错误：
invalid operation: cannot index msg (variable of type interface{})
请指导我如何访问Gin.H的元素。
英文:
trying out the example to find out if the it can be a pubsub, I wonder if it is possible to parse or access the elements in gin.H map. I want to send a Json in a POST.
roomPOST() @ route.go
...
post := gin.H{
"message": "{\"12345\":\"on\",\"23456\":\"off\",}",
}
...
And I wish to do something with it in streamRoom()
streamRoom() @ route.go
...
c.Stream(func(w io.Writer) bool {
select {
case msg := <-listener:
...
fmt.Printf("msg: %s %s\n", reflect.TypeOf(msg), msg)
...
}
msg: gin.H map[message:{"12345":"on","23456":"off"}]
When trying to access the element in msg, e.g.
element := msg["message"].(string)
it throws:
invalid operation: cannot index msg (variable of type interface{})
Please advise how I can access the elements of Gin.H.
答案1
得分: 1
gin.H 被定义为 type H map[string]interface{}。你可以像操作普通的 map 一样对其进行索引。
在你的代码中，msg 是一个 interface{} 类型，其动态类型是 gin.H，可以从 reflect.TypeOf 的输出中看到，所以你不能直接对其进行索引。你需要先进行类型断言，然后再进行索引操作：
content := msg.(gin.H)["message"]
英文:
> I wonder if it is possible to parse or access the elements in gin.H map
gin.H is defined as type H map[string]interface{}. You can index it just like a map.
In your code, msg is an interface{} whose dynamic type is gin.H, as seen from the output of reflect.TypeOf, so you can't index it directly. Type-assert it and then index it:
content := msg.(gin.H)["message"]
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