Struct std::string::FromUtf8Error1.0.0 [] [src]

pub struct FromUtf8Error { /* fields omitted */ }

A possible error value when converting a String from a UTF-8 byte vector.

This type is the error type for the from_utf8() method on String. It is designed in such a way to carefully avoid reallocations: the into_bytes() method will give back the byte vector that was used in the conversion attempt.

The Utf8Error type provided by std::str represents an error that may occur when converting a slice of u8s to a &str. In this sense, it's an analogue to FromUtf8Error, and you can get one from a FromUtf8Error through the utf8_error() method.

Examples

Basic usage:

// some invalid bytes, in a vector
let bytes = vec![0, 159];

let value = String::from_utf8(bytes);

assert!(value.is_err());
assert_eq!(vec![0, 159], value.unwrap_err().into_bytes());Run

Methods

impl FromUtf8Error
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Returns the bytes that were attempted to convert to a String.

This method is carefully constructed to avoid allocation. It will consume the error, moving out the bytes, so that a copy of the bytes does not need to be made.

Examples

Basic usage:

// some invalid bytes, in a vector
let bytes = vec![0, 159];

let value = String::from_utf8(bytes);

assert_eq!(vec![0, 159], value.unwrap_err().into_bytes());Run

Fetch a Utf8Error to get more details about the conversion failure.

The Utf8Error type provided by std::str represents an error that may occur when converting a slice of u8s to a &str. In this sense, it's an analogue to FromUtf8Error. See its documentation for more details on using it.

Examples

Basic usage:

// some invalid bytes, in a vector
let bytes = vec![0, 159];

let error = String::from_utf8(bytes).unwrap_err().utf8_error();

// the first byte is invalid here
assert_eq!(1, error.valid_up_to());Run

Trait Implementations

impl Debug for FromUtf8Error
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Formats the value using the given formatter.

impl Display for FromUtf8Error
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Formats the value using the given formatter.

impl Error for FromUtf8Error
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A short description of the error. Read more

The lower-level cause of this error, if any. Read more