


How to Retrieve the Address of a Non-Pointer Field in Nested Go Structures Using Reflection?
Get Pointer to Value Using Reflection
Reflection plays a crucial role in introspection and dynamic handling of data in Go. However, it presents challenges when targeting non-pointer fields for address retrieval. This article focuses on addressing this issue and provides a solution for obtaining the address of non-pointer fields in nested structures using reflection.
Consider the following sample code:
<code class="go">type Z struct { Id int } type V struct { Id int F Z } type T struct { Id int F V }</code>
Here, T is a nested structure with F as a field of type V, which in turn has another field F of type Z. The goal is to retrieve the address of the Id field within the Z structure.
Using reflection, we can iterate through fields and access their values. However, the code below demonstrates how to handle non-pointer fields and retrieve their addresses:
<code class="go">package main import ( "fmt" "reflect" ) func InspectStructV(val reflect.Value) { // Handle interface types if val.Kind() == reflect.Interface && !val.IsNil() { elm := val.Elem() if elm.Kind() == reflect.Ptr && !elm.IsNil() && elm.Elem().Kind() == reflect.Ptr { val = elm } } // Dereference pointers if val.Kind() == reflect.Ptr { val = val.Elem() } // Iterate over fields for i := 0; i < val.NumField(); i++ { valueField := val.Field(i) typeField := val.Type().Field(i) address := "not-addressable" // Handle nested interfaces if valueField.Kind() == reflect.Interface && !valueField.IsNil() { elm := valueField.Elem() if elm.Kind() == reflect.Ptr && !elm.IsNil() && elm.Elem().Kind() == reflect.Ptr { valueField = elm } } // Dereference embedded pointers if valueField.Kind() == reflect.Ptr { valueField = valueField.Elem() } // Retrieve address if possible if valueField.CanAddr() { address = fmt.Sprintf("0x%X", valueField.Addr().Pointer()) } // Print field details 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()) // Recurse for nested structures if valueField.Kind() == reflect.Struct { InspectStructV(valueField) } } } func InspectStruct(v interface{}) { InspectStructV(reflect.ValueOf(v)) } func main() { 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) }</code>
By passing reflect.Value directly instead of interface{} and dereferencing nested pointers, this code ensures that the address of the Id field within the nested Z structure can be retrieved.
The sample output below demonstrates the successful retrieval of the address for the Id field despite its depth in the nested structure:
Field Name: Id, Field Value: 1, Address: 0x40c1080088, Field type: int, Field kind: int Field Name: F, Field Value: {2 {3}}, Address: 0x40c108008c, Field type: main.V, Field kind: struct Field Name: Id, Field Value: 2, Address: 0x40c1080090, Field type: int, Field kind: int Field Name: F, Field Value: {3}, Address: 0x40c1080098, Field type: main.Z, Field kind: struct Field Name: Id, Field Value: 3, Address: 0x40c10800a0, Field type: int, Field kind: int
The above is the detailed content of How to Retrieve the Address of a Non-Pointer Field in Nested Go Structures Using Reflection?. For more information, please follow other related articles on the PHP Chinese website!

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