rust ffi test

ffi-test.rs

use std::ffi::{CString, CStr};

fn test1() {
    let i = String::from("test_string1");
    let r = CString::new(i).unwrap().as_bytes_with_nul().as_ptr();
    let s = unsafe {
        CStr::from_ptr(r as *const i8).to_string_lossy().into_owned()
    };
    println!("TEST1: {}", s);
}

fn test2() {
    let i = String::from("test_string2");
    let c = CString::new(i).unwrap();
    let r = c.as_bytes_with_nul().as_ptr();
    let s = unsafe {
        CStr::from_ptr(r as *const i8).to_string_lossy().into_owned()
    };
    println!("TEST2: {}", s);
}

fn main() {
    test1();
    test2();
}

output

 nikolay   master  ~  ffi-test  cargo run
   Compiling ffi-test v0.1.0 (file:///Users/nikolay/ffi-test)
    Finished dev [unoptimized + debuginfo] target(s) in 0.88 secs
     Running `target/debug/ffi-test`
TEST1:
TEST2: test_string2
 nikolay   master  ~  ffi-test 