FromVecWithNulError in std::ffi - Rust
Description: An error indicating that a nul byte was not in the expected position.

## FromVecWithNulError

# Struct FromVecWithNulError

1.58.0 · Source

    pub struct FromVecWithNulError { /* private fields */ }

Expand description

An error indicating that a nul byte was not in the expected position.

The vector used to create a `CString` must have one and only one nul byte, positioned at the end.

This error is created by the `CString::from_vec_with_nul` method. See its documentation for more.

## §Examples

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

    let _: FromVecWithNulError = CString::from_vec_with_nul(b"f\0oo".to_vec()).unwrap_err();

## Implementations§

1.58.0 · Source§

### impl FromVecWithNulError

1.58.0 · Source

#### pub fn as_bytes(&self) -> &[u8] ⓘ

Returns a slice of `u8`s bytes that were attempted to convert to a `CString`.

##### §Examples

Basic usage:

    use std::ffi::CString;

    // Some invalid bytes in a vector
    let bytes = b"f\0oo".to_vec();

    let value = CString::from_vec_with_nul(bytes.clone());

    assert_eq!(&bytes[..], value.unwrap_err().as_bytes());

1.58.0 · Source

#### pub fn into_bytes(self) -> Vec<u8> ⓘ

Returns the bytes that were attempted to convert to a `CString`.

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:

    use std::ffi::CString;

    // Some invalid bytes in a vector
    let bytes = b"f\0oo".to_vec();

    let value = CString::from_vec_with_nul(bytes.clone());

    assert_eq!(bytes, value.unwrap_err().into_bytes());

## Trait Implementations§

1.64.0 · Source§

### impl Clone for FromVecWithNulError

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#### fn clone(&self) -> FromVecWithNulError

Returns a duplicate of the value. Read more
1.0.0 · Source§

#### fn clone_from(&mut self, source: &Self)

Performs copy-assignment from `source`. Read more
1.64.0 · Source§

### impl Debug for FromVecWithNulError

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#### fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter. Read more
1.58.0 · Source§

### impl Display for FromVecWithNulError

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#### fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter. Read more
1.58.0 · Source§

### impl Error for FromVecWithNulError

1.30.0 · Source§

#### fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any. Read more
1.0.0 · Source§

#### fn description(&self) -> &str

👎Deprecated since 1.42.0: use the Display impl or to_string()
Read more
1.0.0 · Source§

#### fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0: replaced by Error::source, which can support downcasting
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#### fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (`error_generic_member_access` #99301)
Provides type-based access to context intended for error reports. Read more
1.64.0 · Source§

### impl PartialEq for FromVecWithNulError

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#### fn eq(&self, other: &FromVecWithNulError) -> bool

Tests for `self` and `other` values to be equal, and is used by `==`.
1.0.0 · Source§

#### fn ne(&self, other: &Rhs) -> bool

Tests for `!=`. The default implementation is almost always sufficient, and should not be overridden without very good reason.
1.64.0 · Source§

### impl Eq for FromVecWithNulError

1.64.0 · Source§

### impl StructuralPartialEq for FromVecWithNulError

## Auto Trait Implementations§

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### impl Freeze for FromVecWithNulError

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### impl RefUnwindSafe for FromVecWithNulError

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### impl Send for FromVecWithNulError

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### impl Sync for FromVecWithNulError

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### impl Unpin for FromVecWithNulError

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### impl UnwindSafe for FromVecWithNulError

## Blanket Implementations§

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### impl<T> Any for T
where T: 'static + ?Sized,

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#### fn type_id(&self) -> TypeId

Gets the `TypeId` of `self`. Read more
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### impl<T> Borrow<T> for T
where T: ?Sized,

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#### fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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### impl<T> BorrowMut<T> for T
where T: ?Sized,

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#### fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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### impl<T> CloneToUninit for T
where T: Clone,

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#### unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (`clone_to_uninit` #126799)
Performs copy-assignment from `self` to `dest`. Read more
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### impl<T> From<T> for T

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#### fn from(t: T) -> T

Returns the argument unchanged.

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### impl<T, U> Into<U> for T
where U: From<T>,

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#### fn into(self) -> U

Calls `U::from(self)`.

That is, this conversion is whatever the implementation of `From<T> for U` chooses to do.

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### impl<T> ToOwned for T
where T: Clone,

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#### type Owned = T

The resulting type after obtaining ownership.
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#### fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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#### fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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### impl<T> ToString for T
where T: Display + ?Sized,

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#### fn to_string(&self) -> String

Converts the given value to a `String`. Read more
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### impl<T, U> TryFrom<U> for T
where U: Into<T>,

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#### type Error = Infallible

The type returned in the event of a conversion error.
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#### fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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### impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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#### type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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#### fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.