CString

gistfile1.txt

extern crate libc;                                                              
                                                                                  
use libc::c_char;                                                               
use std::ffi::CString;                                                          
                                                                                  
fn get_string() -> String {                                                     
  String::from("hello world!")                                                
}                                                                               
                                                                                  
#[no_mangle]                                                                    
pub unsafe extern "C" fn c_get_string() -> *mut c_char {                        
  let new_str = get_string();                                                 
  let c_new = CString::new(new_str).unwrap();                                 
  c_new.into_raw()                                                            
}                                                                               
                                                                                  
fn main() {                                                                                                                                         
  println!("{}", get_string());                                               
}