std::string::FromUtf8Error
Struct std::string::FromUtf8Error
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());
Methods
impl FromUtf8Error
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fn as_bytes(&self) -> &[u8]
Returns a slice of [u8]s bytes that were attempted to convert to a String.
Examples
Basic usage:
#![feature(from_utf8_error_as_bytes)] // some invalid bytes, in a vector let bytes = vec![0, 159]; let value = String::from_utf8(bytes); assert_eq!(&[0, 159], value.unwrap_err().as_bytes());
fn into_bytes(self) -> Vec<u8>
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());
fn utf8_error(&self) -> Utf8Error
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());
Trait Implementations
impl Debug for FromUtf8Error
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fn fmt(&self, __arg_0: &mut Formatter) -> Result<(), Error>
Formats the value using the given formatter.
impl Display for FromUtf8Error
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fn fmt(&self, f: &mut Formatter) -> Result<(), Error>
Formats the value using the given formatter. Read more
impl Error for FromUtf8Error
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fn description(&self) -> &str
A short description of the error. Read more
fn cause(&self) -> Option<&Error>
The lower-level cause of this error, if any. Read more
© 2010 The Rust Project Developers
Licensed under the Apache License, Version 2.0 or the MIT license, at your option.
https://doc.rust-lang.org/std/string/struct.FromUtf8Error.html
