我有一个函数,可以遍历作为参数传递的接口的所有字段。为了实现这一点,我正在使用反射。问题是我不知道如何获取非指针字段的地址。这是一个例子:
type Z struct { Id int } type V struct { Id int F Z } type T struct { Id int F V }
上面的代码代表了我的测试结构。现在,这是遍历指定结构并列出有关其详细信息的实际函数:
func InspectStruct(o interface{}) { val := reflect.ValueOf(o) if val.Kind() == reflect.Interface && !val.IsNil() { elm := val.Elem() if elm.Kind() == reflect.Ptr && !elm.IsNil() && elm.Elem().Kind() == reflect.Ptr { val = elm } } if val.Kind() == reflect.Ptr { val = val.Elem() } for i := 0; i < val.NumField(); i++ { valueField := val.Field(i) typeField := val.Type().Field(i) address := "not-addressable" if valueField.Kind() == reflect.Interface && !valueField.IsNil() { elm := valueField.Elem() if elm.Kind() == reflect.Ptr && !elm.IsNil() && elm.Elem().Kind() == reflect.Ptr { valueField = elm } } if valueField.Kind() == reflect.Ptr { valueField = valueField.Elem() } if valueField.CanAddr() { address = fmt.Sprint(valueField.Addr().Pointer()) } fmt.Printf("Field Name: %s,\t Field Value: %v,\t Address: %v\t, Field type: %v\t, Field kind: %v\n", typeField.Name, valueField.Interface(), address, typeField.Type, valueField.Kind()) if valueField.Kind() == reflect.Struct { InspectStruct(valueField.Interface()) } } }
这是结构实例化/初始化之后的实际测试:
t := new(T) t.Id = 1 t.F = *new(V) t.F.Id = 2 t.F.F = *new(Z) t.F.F.Id = 3 InspectStruct(t)
最后是InspectStruct调用的输出:
Field Name: Id, Field Value: 1, Address: 408125440 , Field type: int , Field kind: int Field Name: F, Field Value: {2 {3}}, Address: 408125444 , Field type: main.V , Field kind: struct Field Name: Id, Field Value: 2, Address: not-addressable , Field type: int , Field kind: int Field Name: F, Field Value: {3}, Address: not-addressable , Field type: main.Z , Field kind: struct Field Name: Id, Field Value: 3, Address: not-addressable , Field type: int , Field kind: int
如您所见,我正在使用递归,因此,如果其中一个字段是结构类型,则可以为其调用InspectStruct。 我的问题是,尽管所有字段都已针对整个结构“ t”的层次结构进行了初始化,但我无法获得比“ t”高的深度的任何字段的地址。 我真的很感谢您的帮助。
通过reflect.Value而不是interface{}似乎可以解决问题,但是我不知道为什么valueField.Interface()不起作用。
reflect.Value
interface{}
valueField.Interface()
工作示例:http : //play.golang.org/p/nleA2YWMj8
func InspectStructV(val reflect.Value) { if val.Kind() == reflect.Interface && !val.IsNil() { elm := val.Elem() if elm.Kind() == reflect.Ptr && !elm.IsNil() && elm.Elem().Kind() == reflect.Ptr { val = elm } } if val.Kind() == reflect.Ptr { val = val.Elem() } for i := 0; i < val.NumField(); i++ { valueField := val.Field(i) typeField := val.Type().Field(i) address := "not-addressable" if valueField.Kind() == reflect.Interface && !valueField.IsNil() { elm := valueField.Elem() if elm.Kind() == reflect.Ptr && !elm.IsNil() && elm.Elem().Kind() == reflect.Ptr { valueField = elm } } if valueField.Kind() == reflect.Ptr { valueField = valueField.Elem() } if valueField.CanAddr() { address = fmt.Sprintf("0x%X", valueField.Addr().Pointer()) } fmt.Printf("Field Name: %s,\t Field Value: %v,\t Address: %v\t, Field type: %v\t, Field kind: %v\n", typeField.Name, valueField.Interface(), address, typeField.Type, valueField.Kind()) if valueField.Kind() == reflect.Struct { InspectStructV(valueField) } } } func InspectStruct(v interface{}) { InspectStructV(reflect.ValueOf(v)) }