我正在try 用Rust编写一个库,我可以从Python代码中调用它.我希望能够将一个空指针传递回Python,这样我就可以在调用Rust之间保持状态.然而,当我再次try 访问指针时,却发现 rust 迹斑斑.
完整代码示例和崩溃报告:https://gist.github.com/robyoung/3644f13a05c95cb1b947
密码
#![feature(libc)]
#![feature(alloc)]
extern crate libc;
use std::boxed;
pub struct Point {
x: i64,
y: i32,
}
#[no_mangle]
pub extern "C" fn start_state() -> *mut Point {
let point = Box::new(Point{x: 0, y: 10});
let raw = unsafe { boxed::into_raw(point) };
println!("{:?}", raw);
raw
}
#[no_mangle]
pub extern "C" fn continue_state(point: *mut Point) -> i32 {
println!("{:?}", point);
let p = unsafe { Box::from_raw(point) };
println!("{} {}", p.x, p.y);
0
}
import ctypes
lib = ctypes.cdll.LoadLibrary('target/libpytesttype.so')
lib.start_state.restype = ctypes.c_void_p
pointer = lib.start_state()
print("{:x}".format(pointer))
lib.continue_state(pointer)
输出
0xdc24000
10dc24000
0xdc24000
[1] 64006 segmentation fault python src/main.py
我做错了什么?