開發(fā)流程

在DevEco Studio的模板工程中包含使用Native API的默認(rèn)工程，使用File->New->Create Project創(chuàng)建Native C++模板工程。

在此基礎(chǔ)上進行修改

刪除

entry/src/main/cpp

打開

entry/build-profile.json5

刪除c++ build 配置

{
  "apiType": "stageMode",
  "buildOption": {
    // "externalNativeOptions": {
    //  "path": "./src/main/rust/CMakeLists.txt",
    //  "arguments": "",
    //  "cppFlags": "",
    //  }
  },
  "targets": [
    {
      "name": "default",
      "runtimeOS": "HarmonyOS"
    },
    {
      "name": "ohosTest",
    }
  ]
}

創(chuàng)建rust項目

cargo new hello

修改 Cargo.toml

[package]
name = "hello"
version = "0.1.0"
edition = "2021"

[lib]
name = "hello"
crate-type = ["dylib"]

[dependencies]
oh-napi-sys = "0.1" 
ctor = "0.1"

lib.rs 添加測試代碼

use std::ffi::{CString};
use std::ptr::{null_mut};
use oh_napi_sys::*;
use ctor::ctor;

extern "C" fn add(env: napi_env, info: napi_callback_info) ->napi_value{
    // 期望從ArkTS側(cè)獲取的參數(shù)的數(shù)量，napi_value可理解為ArkTS value在Native方法中的表現(xiàn)形式。

    let mut args:[napi_value; 2] = [null_mut();2];
    let mut argc = args.len();
    unsafe {
        napi_get_cb_info(env, info, &mut argc, args.as_mut_ptr(), null_mut(), null_mut());

        let mut valuetype0  = napi_valuetype_napi_undefined;
        napi_typeof(env, args[0], &mut valuetype0);
        let mut valuetype1  = napi_valuetype_napi_undefined;
        napi_typeof(env, args[1], &mut valuetype1);

        if (valuetype0 != napi_valuetype_napi_number) || (valuetype1 != napi_valuetype_napi_number) {
            let mut undefined: napi_value= null_mut();
            napi_get_undefined(env, &mut undefined);
            return undefined;
        }


        // 將獲取的ArkTS參數(shù)轉(zhuǎn)換為Native信息，此處ArkTS側(cè)傳入了兩個number，這里將其轉(zhuǎn)換為Native側(cè)可以操作的double類型。
        let mut value0 = 0f64;
        napi_get_value_double(env, args[0], &mut value0);

        let mut value1 = 0f64;
        napi_get_value_double(env, args[1], &mut value1);

        // Native側(cè)的業(yè)務(wù)邏輯，這里簡單以兩數(shù)相加為例。
        let native_sum = value0 + value1;


        // 此處將Native側(cè)業(yè)務(wù)邏輯處理結(jié)果轉(zhuǎn)換為ArkTS值，并返回給ArkTS。
        let mut sum = null_mut();
        napi_create_double(env, native_sum, &mut sum);

        return sum;
    }
}
type Callback = extern "C" fn(env: napi_env, info: napi_callback_info) -> napi_value;

unsafe fn new_func_descriptor(name: &'static str, f: Callback) ->napi_property_descriptor{
    let name= CString::new(name).unwrap();
    napi_property_descriptor{
        utf8name: CString::into_raw(name),
        name: null_mut(),
        method: Some(f),
        getter: None,
        setter: None,
        value: null_mut(),
        attributes: napi_property_attributes_napi_default,
        data: null_mut(),
    }
}

// 注冊 module
#[ctor]
fn register_hello_module(){
    let name= CString::new( "hello").unwrap();

    let mut hello_module = napi_module{
        nm_version: 1,
        nm_flags: 0,
        nm_filename: null_mut(),
        nm_register_func: Some(init),
        nm_modname: name.as_ptr() as _,
        nm_priv: 0 as * mut _,
        reserved: [0 as * mut _;4],
    };


    unsafe {
        napi_module_register(&mut hello_module);
    }

    // Init將在exports上掛上Add/NativeCallArkTS這些Native方法，此處的exports就是開發(fā)者import之后獲取到的ArkTS對象。
    unsafe extern "C" fn init(env: napi_env , exports: napi_value )-> napi_value {

        let desc =[
            new_func_descriptor("add", add),
        ];

        let count = desc.len();
        napi_define_properties(env, exports, count, desc.as_ptr());
        return exports;
    }
}

添加對應(yīng)ts代碼

// entry/src/main/rust/types/libhello/index.d.ts

export const add: (a: number, b: number) => number;

// entry/src/main/rust/types/libhello/oh-package.json5

{
  "name": "libhello.so",
  "types": "./index.d.ts",
  "version": "",
  "description": "Please describe the basic information."
}

配置依賴

// entry/oh-package.json5
{
  "name": "entry",
  "version": "1.0.0",
  "description": "Please describe the basic information.",
  "main": "",
  "author": "",
  "license": "",
  "dependencies": {
    "libhello.so": "file:./src/main/rust/types/libhello"
  }
}

在 rust 根目錄下編譯，添加ohos目標(biāo)的教程可以參考 Rust交叉編譯OpenHarmony應(yīng)用動態(tài)庫

cargo build -Zbuild-std  --release  --target aarch64-unknown-linux-ohos

將編譯好的 libhello.so 拷貝至

entry/libs/arm64-v8a

修改頁面 Index.ets

import testNapi from 'libhello.so'

// onClick 里添加
hilog.info(0x0000, 'testTag', 'Test NAPI 2 + 3 = %{public}d', testNapi.add(2, 3));

編譯app點擊hello world，日志中看到 Test NAPI 2 + 3 = 5文章來源地址http://www.zghlxwxcb.cn/news/detail-768236.html

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