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File I O with std::fs and ? Error Propagation - DEV Community In this post, we'll explore the essentials of file I O in Rust, including how to use std::fs to read and write files, and how to leverage the ? operator for elegant error propagation To make things exciting, we'll build a minimalist file copy utility in just 10 lines of Rust code
Trying to propagate Result for file open (std::fs::File) I want to propagate the error up to handle it elsewhere, and just reading through the examples here, this seemed like the way to do it I must be missing something important
Not able to open file even though it is there (working with absolute . . . Have you tried outputting the current directory to see what that actually is for your program? (current_dir in std::env - Rust) Maybe the current directory is the one in which you ran cargo run, which would be pretty normal for the command line
Using Rusts std fs for File System Operations and Error Handling Remember to always handle errors and exceptions, use the ? operator to propagate errors, and avoid using std::fs::File directly With practice and experience, you can become proficient in using std::fs to build powerful and reliable file system applications in Rust