从ArkTs向Native传复杂参数---List参数篇

napi_get_named_property
napi_call_function

build() {   
  Row() {   
    Column() {   
      Text(this.message)   
        .fontSize(50)   
        .fontWeight(FontWeight.Bold)   
        .onClick(() => {   
          hilog.info(0x0000, 'testTag', 'Test NAPI 2 + 3 = %{public}d', testNapi.add(2, 3));   
          let listA: List<string> = new List<string>();   
          listA.add('assssssss');   
          listA.add('aabbbcccc');   
          listA.add('1dddddddd45');   
          listA.add('eeeeeee');   
          listA.add('5ddddddddddd');   
          testNapi.putList(listA);   
        })   
    }   
    .width('100%')   
  }   
  .height('100%')   
}

// 将value转成字符串返回   
static std::string value2String(napi_env env, napi_value value) {   
    size_t stringSize = 0;   
    napi_get_value_string_utf8(env, value, nullptr, 0, &stringSize); // 获取字符串长度   
    std::string valueString;   
    valueString.resize(stringSize + 1);   
    napi_get_value_string_utf8(env, value, &valueString[0], stringSize + 1, &stringSize); // 根据长度传换成字符串   
    return valueString;   
}   
   
// list.get(index) 根据index 取对应list中的值   
static std::string getByIndex(napi_env env, napi_value list, int index) {   
    napi_value indexValue, getFun, value;   
    size_t getStringLength = 0;   
    napi_create_int32(env, index, &indexValue);   
    napi_get_named_property(env, list, "get", &getFun);   
    napi_call_function(env, list, getFun, 1, &indexValue, &value);   
    return value2String(env, value);   
}   
   
static napi_value ts_putList(napi_env env, napi_callback_info info) {   
    size_t argc = 1;   
    napi_value args[1] = {nullptr};   
    napi_get_cb_info(env, info, &argc, args, nullptr, nullptr);   
    napi_value list = args[0]; // 获取list对象   
   
    napi_value length = NULL;   
    napi_get_named_property(env, list, "length", &length);   
   
    int32_t lengthSize = 0;   
    napi_get_value_int32(env, length, &lengthSize); // 获取list长度   
    OH_LOG_Print(LOG_APP, LOG_INFO, LOG_DOMAIN, LOG_TAG, "ts_putList list.length = %{public}d", lengthSize);   
   
    napi_value indexValue, getFun, getValue;   
    size_t getStringLength = 0;   
    for (int index = 0; index < lengthSize; index++) {   
        std::string stringValue = getByIndex(env, list, index);   
        OH_LOG_Print(LOG_APP, LOG_INFO, LOG_DOMAIN, LOG_TAG, "ts_putList list::get = %{public}s", stringValue.c_str());   
    }   
    return nullptr;   
}   
   
EXTERN_C_START   
static napi_value Init(napi_env env, napi_value exports)   
{   
    napi_property_descriptor desc[] = {   
        {"putList", nullptr, ts_putList, nullptr, nullptr, nullptr, napi_default, nullptr},   
        {"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