usestd::fs;usestd::str;fn read_file_as_bytes(path:&str)->Result<String,Box<dyn std::error::Error>>{ let byte_content=fs::read(path)?;let string_content=str::from_utf8(&byte_content)?;Ok(string_content.to_string())} 1. 2. 3. 4. 5. 6. 7. 8. 9. 3,逐行读取文件 如上...
use same_file::Handle;use std::fs::File;use std::io::{BufRead,BufReader,Error,ErrorKind};use std::path::Path;fnmain()->Result<(),Error>{letpath_to_read=Path::new("new.txt");letstdout_handle=Handle::stdout()?;lethandle=Handle::from_path(path_to_read)?;ifstdout_handle==handle...
File 模块实现了提供 BufReader 结构体的 Read trait。File::create 打开文件 File 进行写入,File::open 则进行读取,代码如下: use std::fs::File; use std::io::{Write, BufReader, BufRead, Error}; fn main() -> Result<(), Error> { let path = "lines.txt"; let mut output = File::creat...
letmutread_from:Box<dynRead>=ifxxx is not emptystr{letfile=File::open(Path::new(fpath)).expect(format!("cannot open {}",fpath).as_str());Box::new(file)}else{letstdin=std::io::stdin();Box::new(stdin)}; Stdin类型以及File类型都实现了Readtrait,所以,这样写是没有问题的。下面先来...
1、使用read_to_string方法 // 直接读取文件后存入到字符串,文件不存在则报错letcontent:String=read_to_string("file_path").unwrap(); 2、使用File::read方法 usestd::fs::File;usestd::io::Read;// open()是以只读方式打开文件。不能进行写入letmutfile: File = File::open("foo.txt").unwrap()...
read_file(path){//判断方法结果Ok(file)=>{println!("{}",file)}//OK 代表读取到文件内容,正确打印文件内容Err(e)=>{println!("{} {}",path,e)}//Err代表结果不存在,打印错误结果}}fnread_file(path:&str)->Result<String,Error>{//Result作为结果返回值std::fs::read_to_string(path)//读取...
fn read_lines<P>(filename: P) -> io::Result<io::Lines<io::BufReader<File>>> where P: AsRef<Path>, { let file = File::open(filename)?; Ok(io::BufReader::new(file).lines()) } 1. 2. 3. 4. 5. 6. 7. 8. 9.
使用std::fs::File和std::io::Read模块可以读取文件内容。首先,我们需要打开一个文件,然后读取其内容。以下是一个简单的示例: usestd::fs::File;usestd::io::prelude::*;fnmain() {letmutfile = File::open("file.txt").expect("file not found");letmutcontents =String::new(); ...
use std::fs::{File, OpenOptions}; fn main() { let file = File::open("./test.txt").expect("文件不存在"); //文件权限 let f = OpenOptions::new() .read(true) //读取权限 .write(true) //写入权限 .create(true) //如果path出的文件不存在,创建一个 .append(true) //追加,不会删除...
Read"Installation"fromThe Book. Installing from Source If you really want to install from source (though this is not recommended), seeINSTALL.md. Getting Help Seehttps://www.rust-lang.org/communityfor a list of chat platforms and forums. ...