;letmutreader=BufReader::new(file);letmutwriter=BufWriter::new(io::stdout());letmutline=String::new();loop{letn= reader.read_line(&mut line).await?;if n =={break;} writer.write_all(line.as_bytes()).await?; line.clear();}Ok(())}这个示例演示了如何使用 BufReader 和 BufWr...
(""); pos += BYTES_PER_SIZE; } } //逐行获取 fn show_string(path: &str) { let f = File::open(path).expect("打开文件失败"); let buf = io::BufReader::new(f); for line in buf.lines() { let line = line.unwrap(); println!("{}", line) } } 写入 use std::fs::Open...
fn main() { let b1=std::io::stdout().write("LearnFK ".as_bytes()).unwrap(); let b2=std::io::stdout().write(String::from("Point").as_bytes()).unwrap(); std::io::stdout().write(format!("\nbytes written {}",(b1+b2)).as_bytes()).unwrap(); } 1. 2. 3. 4. 5. 6...
usestd::fs::File;usestd::io::{BufReader,Read};fn read_file_as_single_bytes(path:&str)->Result<(),Box<dyn std::error::Error>>{ letfile=File::open(path)?;let reader=BufReader::new(file);forbyteinreader.bytes(){matchbyte {// byte正好是一个字节Ok(byte)=>process_byte(byte),Err...
usestd::fs::File;usestd::io::{BufReader, Read};fnmain() {letfile = File::open("file.txt").expect("file not found");letmutreader = BufReader::new(file);letmutbuffer = [0;1024];loop{letbytes_read = reader.read(&mutbuffer).expect("unable to read file");ifbytes_read ==0{bre...
会保留换行符// 需要 use std::io::BufRead, 否则没法调用linesbuf_reader.lines();// 一个迭代器,不包含换行符buf_reader.read_until(stop_byte,&mutbyte_vec);// 类似 read_line, 但是返回的是bytesbuf_reader.split(stop_byte);// 类似 .lines(), 但是返回的是 bytes// 如何直接读出 Vec<String...
match deadline_read(&mut async_reader, render_deadline, &mut buf).await { ReadResult::Ok() | ReadResult::Err(_) => break, // EOF or error ReadResult::Timeout => { async_send_render_to_screen(bytes).await; render_deadline = None; } ReadResult::Ok(n_bytes) ...
let mut reader = BufReader::new(input);let mut writer = BufWriter::new(output); let mut buffer = [0;1024];loop {let bytes_read = reader.read(&mut buffer)?;ifbytes_read ==0{break;}writer.write_all(&buffer[..bytes_read])?;}writer.flush()?;Ok(())} ...
let bytes = data.into_bytes(); let path = std::path::Path::new("/tmp/key") if let Some(p) = path.parent() { std::fs::create_dir_all(p).unwrap(); } let mut file = OpenOptions::new() .write(true) .truncate(true)
("{}", String::from_utf8_lossy(&buf));// 按行读取forlineinreader.lines() {println!("{}", line.unwrap()); } 二、写操作 1、使用File::write方法 usestd::fs::File;usestd::io::Write;letcontent: &str="Hello, world";// 以只写的方式打开文件,文件存在则会覆盖原始内容letmutfile: ...