使用外部預構建庫

#ifdef __cplusplus
extern "C" {
#endif

    const char* hello(void) {
        return "Hello, World!";
    }

#ifdef __cplusplus
}
#endif

cmake_minimum_required(VERSION 3.3)
project(hello)
set(CMAKE_CXX_STANDARD 14)
add_library(hello SHARED library.cpp)

export TOOLCHAIN=/Applications/DevEco-Studio.app/contents/sdk/default/openharmony/native/llvm
export SYSROOT=/Applications/DevEco-Studio.app/contents/sdk/default/openharmony/native/sysroot

$TOOLCHAIN/bin/aarch64-linux-ohos-clang++ \
  --sysroot=$SYSROOT \
  -fPIC -shared \
  -o libhello.so \
  library.cpp

entry/libs/arm64-v8a/libhello.so

{
  "buildOption": {
    "externalNativeOptions": {
      "path": "./src/main/cpp/CMakeLists.txt",
      "abiFilters": ["arm64-v8a"]
    }
  }
}

import { dlopen, FFIType, CString, CFunction, JSCallback, Library } from 'arkffi';

const libhello = dlopen('libhello.so', {
  hello: { args: [], returns: FFIType.int64 },
});

const resultPtr = libhello.symbols.hello();
const resultStr = new CString(resultPtr);

console.log(resultStr.toString()); // -> "Hello, World!"

libhello.close();