Node.js
N-API

Introduction

Bonjour à N-API

Ce module enregistre la fonction hello sur le module hello. bonjour la fonction imprime Bonjour tout le monde sur la console avec printf et retourne 1373 de la fonction native dans l'appelant javascript.

#include <node_api.h>
#include <stdio.h>


napi_value say_hello(napi_env env, napi_callback_info info)
{
    napi_value retval;

    printf("Hello world\n");

    napi_create_number(env, 1373, &retval);

    return retval;
}

void init(napi_env env, napi_value exports, napi_value module, void* priv)
{
    napi_status status;
    napi_property_descriptor desc = {
        /*
         * String describing the key for the property, encoded as UTF8.
         */
        .utf8name = "hello",
        /*
         * Set this to make the property descriptor object's value property
         * to be a JavaScript function represented by method.
         * If this is passed in, set value, getter and setter to NULL (since these members won't be used).
         */
        .method = say_hello,
        /*
         * A function to call when a get access of the property is performed.
         * If this is passed in, set value and method to NULL (since these members won't be used).
         * The given function is called implicitly by the runtime when the property is accessed
         * from JavaScript code (or if a get on the property is performed using a N-API call).
         */
        .getter = NULL,
        /*
         * A function to call when a set access of the property is performed.
         * If this is passed in, set value and method to NULL (since these members won't be used).
         * The given function is called implicitly by the runtime when the property is set
         * from JavaScript code (or if a set on the property is performed using a N-API call).
         */
        .setter = NULL,
        /*
         * The value that's retrieved by a get access of the property if the property is a data property.
         * If this is passed in, set getter, setter, method and data to NULL (since these members won't be used).
         */
        .value = NULL,
        /*
         * The attributes associated with the particular property. See napi_property_attributes.
         */
        .attributes = napi_default,
        /*
         * The callback data passed into method, getter and setter if this function is invoked.
         */
        .data = NULL
    };
    /*
     * This method allows the efficient definition of multiple properties on a given object.
     */
    status = napi_define_properties(env, exports, 1, &desc);

    if (status != napi_ok)
        return;
}


NAPI_MODULE(hello, init)