management/front/dkha-web-sz-main/public/card-read/cardReader/index.js

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JavaScript
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let SerialPort = require('serialport');
let Readline = require('@serialport/parser-readline');
let sp;
var timer;
// 建立webscoket连接
var ws = require('nodejs-websocket');
var server = ws.createServer(function(socket) {
socket.on('text', function(str) {   // 在控制台输出前端传来的消息  
console.log(str);
});
}).listen(3001);
// 打开串口服务
function opensp(oldsp, path, baudRate = 115200) {
if (typeof oldsp != 'undefined') {
if (oldsp.isOpen) {
oldsp.close(function(err) {
if (err) throw err;
else {
console.log('串口已经关闭');
opensp(oldsp, path, (baudRate = 115200));
}
});
return null;
}
}
// 打开串口
sp = new SerialPort(
path, {
baudRate: baudRate,
autoOpen: false,
},
false
);
sp.open(function(err) {
if (err) {
console.log('串口打开失败: ' + err);
return null;
}
// 清除定时器
if (timer) {
console.log('clear in timer')
clearInterval(timer);
timer = null;
}
const parser = sp.pipe(new Readline());
parser.on('data', data => {
// let matchRes = data.match(/UID:(\d*),ZID/);
// if (matchRes) {
// // logger.info('当前读取ID' + matchRes[1]);
// if (!timer) {
// timer = setTimeout(() => {
// mySocket.sendText(matchRes[1])
// console.log(matchRes[1])
// timer = null;
// }, 1000)
// }
// return
// }
// 匹配信息字段
if (!data.startsWith("#V10")) {
return
}
let matchRes = data.match(/ID:(\d*)/);
console.log(matchRes[1])
// 建立webscoket连接情况下 发送消息
if (server) {
server.connections.forEach(socket => {
socket.sendText(JSON.stringify({
msg: Number(matchRes[1])
}))
})
}
});
console.log('串口打开成功');
});
//错误监听
sp.on('error', function(err) {
console.log('error: ' + err);
});
// 串口连接关闭后的回调 拔插读卡器
sp.on('close', info => {
// 每隔1s 尝试重新建立串口连接服务
timer = setInterval(() => {
opensp(sp, 'COM3');
}, 1000);
})
}
opensp(sp, 'COM3');