};//Read the myfile contents into a string, returns `io::Result<usize>`let mut s = String::new(); match myfile.read_to_string(&mut s) { Err(why)=> panic!("couldn't read {}: {}", display, why), Ok(_)=> print!("{} contains:\n{}", display, s), }//`myfile` goes...
Unsupported(String), /// An unexpected bug has happened. Please open an issue on github! ReportableBug(String), // 比如这个错误就很严重,严重到要通知作者,所以就被包裹进全局的Error enum中了 /// A read or write error has happened when interacting with the file /// system. Io(io::Erro...
Ok(myfile) => myfile, }; // Read the myfile contents into a string, returns `io::Result<usize>` let mut s = String::new(); match myfile.read_to_string(&mut s) { Err(why) => panic!("couldn't read {}: {}", display, why), Ok(_) => print!("{} contains:\n{}", ...
read_to_string方法:连续读取AsyncRead类型中的数据并存储为字符串。 take方法:创建一个新的AsyncRead类型,其读取操作被限制在指定的字节数范围内。 read_buf方法:从AsyncRead类型中读取数据并存储到指定的缓冲区中,使用了Buf trait来避免了临时的中间缓冲区分配。
string that// describes the errorErr(why)=>panic!("couldn't open {}: {}",display,why.description()),Ok(file)=>file,};// Read the file contents into a string, returns `io::Result<usize>`letmuts=String::new();matchfile.read_to_string(&muts){Err(why)=>panic!("couldn't read {...
代码仓库:pdf-rs/pdf: Rust library to read, manipulate and write PDF files. (github.com) calamine Rust 编写的 Excel/OpenDocument 电子表格文件阅读器/反序列化器。 代码仓库:tafia/calamine: A pure Rust Excel/OpenDocument SpeadSheets file reader: rust on metal sheets (github.com) docx-rs 一个带...
To understand this book, it's enough to know what integers and floating-point numbers are, and to distinguish identifiers from string literals. Rust Cookbook This book will help you understand the core concepts of the Rust language, enabling you to develop efficient and high-performance ...
将try_into() 函数添加在 u16 类型 b.try_into() 返回一个 i32 类型的值,try_into()会在转换出错的时候返回错误信息。(细节在下一章) 浮点危害 对浮点数类型(f32 和 f64)进行比较是一个特别的情况,有两点原因: 浮点数通常近似于它们所代表的数字,因为浮点类型是以基数 2 来实现的,但我们经常以基数 10...
use std::fs::File;use std::io::Read;fnread_file(name:&str)->Result<String,std::io::Error>{letmut f=File::open(name)?;letmut contents=String::new();f.read_to_string(&mut contents)?;Ok(contents)} ?操作符 展开来就类似这样: ...
Value}; use chrono::{Local}; use anyhow::{Error, Result}; // 读取给定图片文件的exif信息,返回图片的创建时间 格式 2023-10-17 // allow_no_exif: 如果没有exif信息,是否使用图片文件的创建信息 pub fn read_datetime(img: &mut File, allow_no_exif: bool) -> Result<(String, String)> { //...