在 WebSocket (ws) 上接收一个 ArrayBuffer

Question

我想使用ws处理从客户端收到的 ArrayBuffer 消息。客户端，由于ws.binaryType，我直接收到了一个 ArrayBuffer，但服务器端，我没有收到一个 ArrayBuffer 而是这样的（字符串？）： '< Buffer 00 00 2a 00 00 00 00 00 00 00 00 00 00 00 00 00>'。

服务器如何接收 ArrayBuffer ？

客户端 ：

var ws = new WebSocket("ws://localhost:3000/");
ws.binaryType = 'arraybuffer';
ws.onopen = function() {
    var buffer = new ArrayBuffer(15);
    var dv = new DataView(buffer);
    dv.setInt16(1, 42);
    ws.send(buffer);
};

服务器端 ：

var express = require('express'),
app = express(),
server = require('http').createServer(),
WebSocketServer = require('ws').Server,
wss = new WebSocketServer({
    server: server
});

...

wss.on('connection', function(socket) {
    console.log(message);
    //log : <Buffer 00 00 2a 00 00 00 00 00 00 00 00 00 00 00 00 00>


    socket.on('message', function(message) {

        //would like to read and handle the arraybuffer properly

    });
});

Answer 1

只需将 Buffer 转换为 ArrayBuffer

var buf = new Uint8Array(message).buffer;
var dv = new DataView(buf);