rustHow to read file line by line in rust
Reading a file line by line in Rust can be done using the std::fs::File
type and the BufReader
type from the std::io::BufReader
module. To read a file line by line, first open the file in read-only mode using the File::open
method. Then, create a BufReader
from the file handle. Finally, use the BufReader::lines
method to iterate over the lines of the file. The following ## Code example shows how to read a file line by line:
use std::fs::File;
use std::io::{BufReader, BufRead};
fn main() {
let file = File::open("my_file.txt").expect("Unable to open file");
let reader = BufReader::new(file);
for line in reader.lines() {
let line = line.expect("Unable to read line");
println!("{}", line);
}
}
In this example, the File::open
method is used to open the file in read-only mode. Then, a BufReader
is created from the file handle. Finally, the BufReader::lines
method is used to iterate over the lines of the file. For each line, the expect
method is used to unwrap the Result
type and print the line.
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