导致恐慌的Reflect.Value.FieldByName [英] Reflect.Value.FieldByName causing Panic
问题描述
在调用反射值的.FieldByName方法时出现以下错误,确切的错误是: -
$ b $
panic:reflect:在ptr上调用reflect.Value.FieldByName Value
,代码如下: -
s:= reflect.ValueOf(& value).Elem()(value是一个结构)
metric := s.FieldByName(subval.Metric).Interface()(subval.Metric是一个字符串)
我知道这并不多,但这是我可以得到的所有信息。
以下是Go Playground上代码的链接: http://play.golang.org/p/E038cPOoGp
您的值
已经是一个指向结构体的指针。尝试在代码中打印 s.Kind()
。
没有理由将 value
,然后在 reflect.Value
上调用 Elem()
,
$ b
s:= reflect.ValueOf(value).Elem()
metric := s.FieldByName(subvalMetric).Interface()
fmt.Println(metric)
I'm getting the following error when calling the .FieldByName method of a reflected value, the exact error is :-
panic: reflect: call of reflect.Value.FieldByName on ptr Value
and the code is :-
s := reflect.ValueOf(&value).Elem() (value is a struct)
metric := s.FieldByName(subval.Metric).Interface() (subval.Metric is a string)
I understand this isn't much, but this is all the information I can get.
Here's a link to the code on Go Playground: http://play.golang.org/p/E038cPOoGp
Your value
is already a pointer to a struct. Try printing out s.Kind()
in your code.
There's no reason to take the address of value
, then call Elem()
on that reflect.Value
, which dereferences the pointer you just created.
s := reflect.ValueOf(value).Elem()
metric := s.FieldByName(subvalMetric).Interface()
fmt.Println(metric)
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