问题描述

问题来自于rust英文论坛的一个问题，链接https://users.rust-lang.org/t/pushing-u8-values-to-a-string/36060，　错误代码如下：

fn main() {
    let mut signature_string = String::new(); 
    let signature_code =  [177,187,102,36,165,137,39,
    63,52,197,173,13,168,216,95,3,175,113,213,98,52,
    77,175,152,79,188,119,141,52,19,19,53,];

    for a in signature_code().iter() { 
         println!(" N: {:x?}", a); 
         signature_string.push(a);  
    }

    println!("the entire array HEX as a single string: {}", signature_string);
}

正确代码

思路，使用宏来解决，代码如下：

fn main() {
    use std::fmt::Write;

    let mut signature_string = String::new();
    let signature_code = [177,187,102,36,165,137,39,
    63,52,197,173,13,168,216,95,3,175,113,213,98,52,
    77,175,152,79,188,119,141,52,19,19,53,]; 

    //for a in signature_code().iter() { 
    for a in signature_code.iter() { 
        //println!(" N: {:x?}", a); 
        //signature_string.push(a);
        write!(signature_string, "{:02x}", a);
    }

    println!("the entire array HEX as a single string: {}", signature_string);
}

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