在NODeJS中将十六进制字节转换为TCP套接字上的十进制重述

Question

我在我的tcp套接字上将000F313233343536373839303132333435转换为字节，并希望将它转换为123456789012345，我想将套接字上的字节流转换为数字。

function onConnect(socket) {
    socket.setEncoding('utf8');//Socket data to utf8 format
    
    socket.on('data', function (data) { //Socket event when data is sent from tcp client
    var buffer = Buffer.from(data,"hex");

        let clientport=socket.remotePort;
        let clientadd=socket.remoteAddress;
        console.log(clientadd+":"+clientport)

        console.log("--",data,"--")

        
        console.log(buffer);
        var msg = buffer.toString()
        var msglength = msg.length;
        console.log(msglength);
        

        
    })//<=on data

Answer 1

如果您知道您的号码总是适合于Number.MAX_SAFE_INTEGER，则可以使用简单的Number转换：

const HEADER_LEN = 2;

const src = Buffer.from('000F313233343536373839303132333435', 'hex');

const len = src.readUInt16BE();
const hex = src.toString('utf8', HEADER_LEN, HEADER_LEN + len); // skip first 2 header bytes

console.log(Number(hex)); // 123456789012345

如果它可以是任意长度的整数，也可以指向BigInt：

const bigSrc = Buffer.from(
  '002D313233343536373839303132333435313233343536373839303132333435313233343536373839303132333435',
  'hex'
);

const bigLen = bigSrc.readUInt16BE();
const bigStr = bigSrc.toString('utf8', HEADER_LEN, HEADER_LEN + bigLen); // skip first 2 header bytes

console.log(BigInt(bigStr)); // 123456789012345123456789012345123456789012345n

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