douchensou6495 2014-07-30 07:35
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Go接口的未导出字段或方法

I am quite new to go, and I am trying to loop through each field of an interface (can be different struct) but I am not sure what is going wrong with the following code? it reports runtime error: panic: reflect.Value.Interface: cannot return value obtained from unexported field or method

what are those unexported field/method? I have the SomeField field capitalized thanks

type SomeStruct struct {
SomeField   uint32
}

func test(obj interface{}){
  typ := reflect.TypeOf(obj)
  val := reflect.ValueOf(obj)
  for i := 0; i < typ.NumField(); i++ {
    fieldValue := val.Field(i).Interface()
    fmt.Println(fieldValue)
  }
}

func test1(obj interface{}){
  val := reflect.ValueOf(obj)
  test(val)
}

func main() {
  var ss SomeStruct
  test1(ss)
}
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2条回答 默认 最新

  • douwei1408 2014-07-30 07:42
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    I think you just wanted to run this:

    package main
    
    import "fmt"
    import "reflect"
    
    type SomeStruct struct {
    SomeField   uint32
    }
    
    func test(obj interface{}){
      typ := reflect.TypeOf(obj)
      val := reflect.ValueOf(obj)
      for i := 0; i < typ.NumField(); i++ {
        fieldValue := val.Field(i).Interface()
        fmt.Println(fieldValue)
      }
    }
    
    func main() {
      var ss SomeStruct
      test(ss)
      ss.SomeField = 1
      test(ss)
    }
    

    Your original code tries to get a value of each field of val := reflect.ValueOf(ss) instead of ss.

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