---
title: "init(validatingCString:)"
framework: swift
role: symbol
role_heading: Initializer
path: "swift/string/init(validatingcstring:)-98wra"
---

# init(validatingCString:)

Creates a new string by copying and validating the null-terminated UTF-8 data referenced by the given array.

## Declaration

```swift
init?(validatingCString nullTerminatedUTF8: [CChar])
```

## Parameters

- `nullTerminatedUTF8`: An array containing a null-terminated sequence of UTF-8 code units.

## Discussion

Discussion This initializer does not try to repair ill-formed UTF-8 code unit sequences. If any are found, the result of the initializer is nil. note: This initializer is deprecated. Use the initializer String.init?(validating: array, as: UTF8.self) instead, remembering that “\0” is a valid character in Swift.

## See Also

### Converting a C String

- [init(bytes:encoding:)](swift/string/init(bytes:encoding:).md)
- [init(bytesNoCopy:length:encoding:freeWhenDone:)](swift/string/init(bytesnocopy:length:encoding:freewhendone:).md)
- [init(validatingCString:)](swift/string/init(validatingcstring:)-992vo.md)
- [init(cString:)](swift/string/init(cstring:)-2p84k.md)
- [init(cString:)](swift/string/init(cstring:)-6kr8s.md)
- [init(cString:encoding:)](swift/string/init(cstring:encoding:)-3h7bc.md)
- [init(cString:encoding:)](swift/string/init(cstring:encoding:)-3qgzd.md)
- [init(decodingCString:as:)](swift/string/init(decodingcstring:as:)-8way7.md)
- [decodeCString(_:as:repairingInvalidCodeUnits:)](swift/string/decodecstring(_:as:repairinginvalidcodeunits:)-46n2p.md)