以下是基于 N-API 的示例;我也鼓励您采用基于 node-addon-api 的类似实现(在N-API之上使用C ++包装器很容易)
https://github.com/nodejs/node-addon-examples/tree/master/array_buffer_to_native/node-addon-api
#include <assert.h>
#include "addon_api.h"
#include "stdio.h"
napi_value CArrayBuffSum(napi_env env,napi_callback_info info)
{
napi_status status;
const size_t MaxArgExpected = 1;
napi_value args[MaxArgExpected];
size_t argc = sizeof(args) / sizeof(napi_value);
status = napi_get_cb_info(env,info,&argc,args,nullptr,nullptr);
assert(status == napi_ok);
if (argc < 1)
napi_throw_error(env,"EINVAL","Too few arguments");
napi_value buff = args[0];
napi_valuetype valuetype;
status = napi_typeof(env,buff,&valuetype);
assert(status == napi_ok);
if (valuetype == napi_object)
{
bool isArrayBuff = 0;
status = napi_is_arraybuffer(env,&isArrayBuff);
assert(status == napi_ok);
if (isArrayBuff != true)
napi_throw_error(env,"Expected an ArrayBuffer");
}
int32_t *buff_data = NULL;
size_t byte_length = 0;
int32_t sum = 0;
napi_get_arraybuffer_info(env,(void **)&buff_data,&byte_length);
assert(status == napi_ok);
printf("\nC: Int32Array size = %d,(ie: bytes=%d)",(int)(byte_length / sizeof(int32_t)),(int)byte_length);
for (int i = 0; i < byte_length / sizeof(int32_t); ++i)
{
sum += *(buff_data + i);
printf("\nC: Int32ArrayBuff[%d] = %d",i,*(buff_data + i));
}
napi_value rcValue;
napi_create_int32(env,sum,&rcValue);
return (rcValue);
}
调用插件的JavaScript代码
'use strict'
const myaddon = require('bindings')('mync1');
function test1() {
const array = new Int32Array(10);
for (let i = 0; i < 10; ++i)
array[i] = i * 5;
const sum = myaddon.ArrayBuffSum(array.buffer);
console.log();
console.log(`js: Sum of the array = ${sum}`);
}
test1();
代码执行的输出:
C: Int32Array size = 10,(ie: bytes=40)
C: Int32ArrayBuff[0] = 0
C: Int32ArrayBuff[1] = 5
C: Int32ArrayBuff[2] = 10
C: Int32ArrayBuff[3] = 15
C: Int32ArrayBuff[4] = 20
C: Int32ArrayBuff[5] = 25
C: Int32ArrayBuff[6] = 30
C: Int32ArrayBuff[7] = 35
C: Int32ArrayBuff[8] = 40
C: Int32ArrayBuff[9] = 45
js: Sum of the array = 225
本文链接:https://www.f2er.com/3163180.html