import hilog from '@ohos.hilog';           //導(dǎo)入hilog
import testNapi from 'libentry.so';     //導(dǎo)入nativeC++模塊

@Entry
@Component
struct Index {
  @State message: string = 'Hello World';

  build() {
    Row() {
      Column() {
        Text(this.message)
          .fontSize(50)
          .fontWeight(FontWeight.Bold)
          .onClick(() => {
            //調(diào)用nativeC++代碼
            hilog.info(0x0000, 'testTag', 'Test NAPI 2 + 3 = %{public}d', testNapi.add(2, 3));
          })
      }
      .width('100%')
    }
    .height('100%')
  }
}

# the minimum version of CMake.
cmake_minimum_required(VERSION 3.4.1)
project(MyNDKApplication)
# 編譯路徑
set(NATIVERENDER_ROOT_PATH ${CMAKE_CURRENT_SOURCE_DIR})
# 編譯頭文件路徑
include_directories(${NATIVERENDER_ROOT_PATH}
                    ${NATIVERENDER_ROOT_PATH}/include)
# 編譯對(duì)象entry是對(duì)應(yīng)用層可見(jiàn)的so，即import testNapi from 'libentry.so'
add_library(entry SHARED hello.cpp)
# 這是link命令，libace_napi 這個(gè)就是node-api需要用的so庫(kù);
target_link_libraries(entry PUBLIC libace_napi.z.so)

#include "napi/native_api.h"
// 對(duì)外node-api方法，對(duì)應(yīng)testNapi.add(2, 3)
static napi_value Add(napi_env env, napi_callback_info info)
{
    size_t requireArgc = 2;
    size_t argc = 2;
    napi_value args[2] = {nullptr};

    napi_get_cb_info(env, info, &argc, args , nullptr, nullptr);

    napi_valuetype valuetype0;
    napi_typeof(env, args[0], &valuetype0);

    napi_valuetype valuetype1;
    napi_typeof(env, args[1], &valuetype1);

    double value0;
    napi_get_value_double(env, args[0], &value0);

    double value1;
    napi_get_value_double(env, args[1], &value1);

    napi_value sum;
    napi_create_double(env, value0 + value1, &sum);

    return sum;

}
// 模塊初始化方法，對(duì)應(yīng)的方法在這加入對(duì)外描述隊(duì)列
EXTERN_C_START
static napi_value Init(napi_env env, napi_value exports)
{
    napi_property_descriptor desc[] = {
        { "add", nullptr, Add, nullptr, nullptr, nullptr, napi_default, nullptr }
    };
    napi_define_properties(env, exports, sizeof(desc) / sizeof(desc[0]), desc);
    return exports;
}
EXTERN_C_END
// 模塊聲明，import時(shí)候調(diào)用
static napi_module demoModule = {
    .nm_version = 1,
    .nm_flags = 0,
    .nm_filename = nullptr,
    .nm_register_func = Init,
    .nm_modname = "entry",
    .nm_priv = ((void*)0),
    .reserved = { 0 },
};
// 模塊入口注冊(cè)
extern "C" __attribute__((constructor)) void RegisterEntryModule(void)
{
    napi_module_register(&demoModule);
}

# the minimum version of CMake.
cmake_minimum_required(VERSION 3.4.1)
project(MyNDKApplication)

set(NATIVERENDER_ROOT_PATH ${CMAKE_CURRENT_SOURCE_DIR})

include_directories(${NATIVERENDER_ROOT_PATH}
                    ${NATIVERENDER_ROOT_PATH}/include)
# 增加hiloglib庫(kù)引用
find_library(
    # Sets the name of the path variable.
    hilog-lib
    # Specifies the name of the NDK library that
    # you want CMake to locate.
    hilog_ndk.z
)

add_library(entry SHARED hello.cpp)
# 增加hiloglib庫(kù)連接
target_link_libraries(entry PUBLIC ${hilog-lib} libace_napi.z.so)

// 增加hilog頭文件
#include <hilog/log.h>
#include "napi/native_api.h"

static napi_value Add(napi_env env, napi_callback_info info)
{
    // 增加打印輸出
    const unsigned int LOG_PRINT_DOMAIN = 0xFF00;
    OH_LOG_Print(LOG_APP, LOG_INFO, LOG_PRINT_DOMAIN, "Init", "Init begins");
    size_t requireArgc = 2;
    size_t argc = 2;
    napi_value args[2] = {nullptr};
    
...

08-07 05:40:25.079  15167-15167  A0ff00/Init                    com.example.myndkapplication    I  Init begins
08-07 05:40:25.079  15167-15167  A00000/testTag                 com.example.myndkapplication    I  Test NAPI 2 + 3 = 5

# Generate NDK library from NDK description file.
#
# Variables:
#  ndk_description_file:
#  min_compact_version: string specifies the minimal compactible version of NDK.
#    set to major_version in default.
#
template("ohos_ndk_library") {
  forward_variables_from(invoker, [ "testonly" ])
  assert(defined(invoker.ndk_description_file),
         "ndk description file is necessary ")
...
// 在GN里用ohos_ndk_library生成ndk庫(kù)和頭文件，如
    
ohos_ndk_library("libhilog_ndk") {
  output_name = "hilog_ndk"
  ndk_description_file = "./libhilog.ndk.json"
  min_compact_version = "1"
  system_capability = "SystemCapability.HiviewDFX.HiLog"
}

ohos_ndk_headers("hilog_header") {
  dest_dir = "$ndk_headers_out_dir/hilog"
  sources = [ "./include/hilog/log.h" ]
} 

// ndk_description_file 對(duì)應(yīng)的 libhilog.ndk.json 文件里聲明了導(dǎo)出的接口函數(shù)
[
    {
        "name": "OH_LOG_Print"
    },
    {
        "name": "OH_LOG_IsLoggable"
    }
]

// ohos 編譯fullsdk的命令：./build.sh --product-name ohos-sdk