在Rust中调用Rust动态库

配置Cargo.toml

首先我们先在Cargo.toml中添加相关配置

[[bin]]
name = "master"
path = "src/master/master.rs"

[lib]
name = "speaker"
path = "src/plugins/speaker.rs"
crate-type = ["cdylib"]

[dependencies]
libloading = "*"

其中, speaker是动态库, master是调用动态库的主程序

创建动态库

#[no_mangle]
pub extern fn run() {
    println!("Hello, speaker!");
}

#[no_mangle]表示禁用name mangling, 它表示以原始的函数名编译函数, 因为在一些支持重载的语言中, 编译的函数名并不是在代码中声明的函数名, 而是函数名加参数类型.

在主程序中调用动态库

extern crate libloading as lib;

fn call_dynamic() -> Result<u32, Box<dyn std::error::Error>> {
    let lib = lib::Library::new("/Data/Rust/learn4libloading/target/debug/libspeaker.dylib")?;
    unsafe {
        let func: lib::Symbol<unsafe extern fn() -> u32> = lib.get(b"run")?;
        Ok(func())
    }
}

fn main() {
    println!("Hello, master!");
    let rst = call_dynamic();
    match rst {
        Ok(i) => println!("{}", i),
        Err(e) => println!("{}", e)
    }

}