// 二维码中间件
const express = require('express');
const router = express.Router();
const fs = require('fs')
const path = require('path')
router.get('/', (req, res, next) => {
    const qrcodeName = Date.now() + '-' + Math.random().toString(36).slice(-6);
    const filePath = path.resolve(__dirname, `./../public/qrcode/${qrcodeName}.png`);
    // 给客户端返回一个文件流
    //格式必须为 binary，否则会出错
    // 创建文件可读流
    const cs = fs.createReadStream(filePath);
    cs.on("data", chunk => {
        res.write(chunk);
    })
    cs.on("end", () => {
        res.status(200);
        res.end();
    })
})
module.exports = router;