arrays - How to convert IoSliceMut array into Vec?

Question

let mut buffer = Vec::with_capacity(10);
stream.read_vectored(&mut buffer);

The code above turns buffer into an IoSliceMut vector, but I don't know how to read from this vector or how to convert it back into a Vec<u8>.

标签： arraysvectorrustbufferslice

Answer 1

您不必将IoSliceMut结构转换回u8数组，read_vectored将字节直接写入数组缓冲区，因为您通过可变引用传递它们。之后您可以只使用缓冲区，它们会将数据写入其中。例子：

use std::io::IoSliceMut;
use std::io::Read;

fn main() {
    let mut buffer: [u8; 10] = [0; 10];
    let mut io_slices = [IoSliceMut::new(&mut buffer)];
    let mut data: &[u8] = &[1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
    data.read_vectored(&mut io_slices);
    dbg!(data, buffer); // data is now in buffer
}

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