std::ffi::NulError - Rust
Description: API documentation for the Rust `NulError` struct in crate `std`.
Keywords: rust, rustlang, rust-lang, NulError

# Struct std::ffi::NulError 1.0.0 [−] [src]

    pub struct NulError(_, _);

An error indicating that an interior nul byte was found.

While Rust strings may contain nul bytes in the middle, C strings can't, as that byte would effectively truncate the string.

This error is created by the `new` method on `CString`. See its documentation for more.

# Examples

    use std::ffi::{CString, NulError};

    let _: NulError = CString::new(b"f\0oo".to_vec()).unwrap_err();Run

## Methods

### `impl NulError`
[src]

#### `pub fn nul_position(&self) -> usize`
[src]

Returns the position of the nul byte in the slice that caused `CString::new` to fail.

# Examples

    use std::ffi::CString;

    let nul_error = CString::new("foo\0bar").unwrap_err();
    assert_eq!(nul_error.nul_position(), 3);

    let nul_error = CString::new("foo bar\0").unwrap_err();
    assert_eq!(nul_error.nul_position(), 7);Run

####
ⓘImportant traits for Vec<u8>

### Important traits for Vec<u8>

`impl Write for Vec<u8>`
`pub fn into_vec(self) -> Vec<u8>`
[src]

Consumes this error, returning the underlying vector of bytes which generated the error in the first place.

# Examples

    use std::ffi::CString;

    let nul_error = CString::new("foo\0bar").unwrap_err();
    assert_eq!(nul_error.into_vec(), b"foo\0bar");Run

## Trait Implementations

### `impl Clone for NulError`
[src]

#### `fn clone(&self) -> NulError`
[src]

Returns a copy of the value. Read more

#### `fn clone_from(&mut self, source: &Self)`
[src]

Performs copy-assignment from `source`. Read more

### `impl PartialEq for NulError`
[src]

#### `fn eq(&self, __arg_0: &NulError) -> bool`
[src]

This method tests for `self` and `other` values to be equal, and is used by `==`. Read more

#### `fn ne(&self, __arg_0: &NulError) -> bool`
[src]

This method tests for `!=`.

### `impl Eq for NulError`
[src]

### `impl Debug for NulError`
[src]

#### `fn fmt(&self, __arg_0: &mut Formatter) -> Result`
[src]

Formats the value using the given formatter. Read more

### `impl Error for NulError`
[src]

#### `fn description(&self) -> &str`
[src]

A short description of the error. Read more

#### `fn cause(&self) -> Option<&Error>`
[src]

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

### `impl Display for NulError`
[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result`
[src]

Formats the value using the given formatter. Read more

### `impl From<NulError> for Error`
[src]

#### `fn from(_: NulError) -> Error`
[src]

Performs the conversion.

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