TryFromSliceError
RustERRORCommonType Conversion
Slice length mismatch
Quick Answer
Verify slice length before converting, or use slice indexing to extract the right number of bytes.
What this means
Returned by <[T; N]>::try_from(&[T]) when the slice length does not match the target array length.
Why it happens
- 1Byte slice shorter or longer than the target array size
- 2Protocol data unexpectedly truncated
Fix
Convert a known-length slice
Convert a known-length slice
let bytes: &[u8] = &data[0..4];
let arr: [u8; 4] = bytes.try_into()
.map_err(|_| "expected exactly 4 bytes")?;
let value = u32::from_le_bytes(arr);Why this works
Slicing to the exact length before try_into() eliminates the mismatch.
Code examples
Triggerrust
let a: [u8; 4] = [1u8, 2].as_ref().try_into()?; // wrong length
Sources
Official documentation ↗
Rust std::array
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