RUST编写和调用DLL

1  执行 cargo new  hellolib --lib 创建库项目

修改 cargo.toml 

[lib]
name = "myfirst_rust_dll" #生成dll的文件名
crate-type = ["dylib"]

lib.rs

#[no_mangle]
pub extern fn hello_rust(){
    println!("Hello rust dll!");
}

执行：  cargo build --release

生成了myfirst_rust_dll.dll

2、现在准备调用上面的myfirst_rust_dll.dll

执行 cargo new  hello 创建二进制项目

修改 cargo.toml 

[dependencies]
libloading = "0.7"

main.rs

extern crate libloading;

fn call_dynamic() -> Result<u32, Box<dyn std::error::Error>> {
    unsafe {
        let lib = libloading::Library::new("myfirst_rust_dll.dll")?;
        let func: libloading::Symbol<unsafe extern fn() -> u32> = lib.get(b"hello_rust")?;
        Ok(func())
    }
}
fn main() {
    let _a =call_dynamic();

}

将myfirst_rust_dll.dll复制到hello目录下，在VSCode中调试，将输出："Hello rust dll!"

或将myfirst_rust_dll.dll复制到debug目录下，在控制台中运行hello.exe ，也将输出："Hello rust dll!"

参考：https://blog.yasking.org/a/rust-dll-clipboard.html

https://docs.rs/libloading/0.7.0/libloading/

https://blog.csdn.net/wowotuo/article/details/86251732