---
title: kCFStringEncodingInvalidId
framework: corefoundation
role: symbol
role_heading: Global Variable
path: corefoundation/kcfstringencodinginvalidid
---

# kCFStringEncodingInvalidId

Used as a function result to identify an encoding that is not supported or recognized by CFString.

## Declaration

```swift
var kCFStringEncodingInvalidId: UInt32 { get }
```