rust跨平台调用动态库

动态库在不同的操作系统，扩展名是不一样的，所以要做处理:

static LIB: Lazy<Mutex<Option<Library>>> = Lazy::new(|| Mutex::new(None));


type CreateFunc = unsafe extern "C" fn(*const c_char, *const c_char) -> c_int;
type AddFunc =
unsafe extern "C" fn(*const c_char, *const c_char, *const c_char, *const c_char) -> c_int;

type CreateFuncoracle = unsafe extern "C" fn(*const c_char, *const c_char) -> c_int;

type AddFuncoracle =
unsafe extern "C" fn(*const c_char, *const c_char, *const c_char, *const c_char) -> c_int;
#[cfg(target_os = "windows")]
const LIB_NAME: &str = "test.dll";

#[cfg(target_os = "macos")]
const LIB_NAME: &str = "./resources/test.dylib";

#[cfg(target_os = "linux")]
const LIB_NAME: &str = "./resources/test.so";

// 初始化全局变量
pub fn initialize_library() -> Result<(), ApiError> {
    let mut lib = LIB.lock().unwrap();
    *lib = Some(unsafe {
        Library::new(LIB_NAME).map_err(|e| {
            ApiError::InternalError(format!("无法加载库: {}", e))
        })?
    });
    Ok(())
}


unsafe {
                                                            let lib1 = LIB.lock()
                                                                .map_err(|e| { ApiError::InternalError(format!("无法加载库: {}", e)) })?;
                                                            if let Some(ref lib) = *lib1 {
                                                            // 获取 setdata_mssql_create 方法的符号
                                                            let create: Symbol<CreateFunc> = lib
                                                                .get(b"setdata_mssql_create")
                                                                .map_err(|e| { ApiError::InternalError(format!("无法加载函数: {}", e)) })?;
                                                            //let connectionString = "Server=192.168.3.115;Database=testdb;User Id=sa;Password=****;TrustServerCertificate=True;";
                                                            let c_stringconnectionString =
                                                                CString::new(connectionString)
                                                                    .map_err(|e| { ApiError::InternalError(format!("无法创建字符串: {}", e)) })?;
                                                            let c_ptrconnectionString: *const c_char = c_stringconnectionString.as_ptr();

                                                            let createString = sql.as_str();
                                                            let c_stringcreateString =
                                                                CString::new(createString)
                                                                    .map_err(|e| { ApiError::InternalError(format!("无法创建字符串: {}", e)) })?;
                                                            let c_ptrcreateString: *const c_char =
                                                                c_stringcreateString.as_ptr();

                                                            let result = create(
                                                                c_ptrconnectionString,
                                                                c_ptrcreateString,
                                                            );
                                                            if (result != 1) {
                                                                warn!("表修改没有成功，详情请看日志文件，sql:{}",sql);
                                                                return Err(ApiError::InternalError(format!("表修改没有成功，详情请看日志文件，sql:{}",sql)));
                                                            }
                                                            } else {
                                                                println!("Library is not initialized");
                                                            }
                                                        }

部分代码摘自hpctb，实测方案可行。