Question

过去几周我一直在学习防锈，并且我认为我对这种语言的使用感到满意。对于我的一个个人项目，我无法从Java调用rust代码（编译为dll）。

这是我目前用于防锈代码的内容：

use std::f64;
use std::any::Any;

#[no_mangle]
pub extern fn _Java_getDifferenceInAngleDegrees(env: *const (), jclass: *const (),from: f64, to: f64) -> f64 {
    let mut angle = to - from;
    // Naive algorithm
    while (angle >= 180.0) {
        angle -= 360.0;
    }
    while (angle < -180.0) {
        angle += 360.0;
    }
    angle
}

fn main() {
    println!("a");
}

这是我尝试在Java中加载它的方式

import java.io.File;

public class test{
    public static native double getDifferenceInAngleDegrees(double from, double to);        

    public static void main(String[] args) {
        File f = new File("rustMath.dll");
        System.load(f.getAbsolutePath());
        System.out.println(test.getDifferenceInAngleDegrees(120.0, 119.0));
    }
}

我得到的错误是：

Exception in thread "main" java.lang.UnsatisfiedLinkError: test.getDifferenceInAngleDegrees(DD)D
        at test.getDifferenceInAngleDegrees(Native Method)
        at test.main(test.java:17)

Cargo.toml

[package]
name = "rustMath"
version = "0.1.0"
authors = ["22ethompson"]
edition = "2018"

[lib]
crate-type = ["cdylib"]
path = "src/main.rs"

[profile.release]
lto = true

[dependencies]
jni = "0.10.2"

在Java中加载Rust代码，java.lang.UnsatisfiedLinkError：

0 个答案: