Nodejs Multer成功获得返回值

2024-05-06 • 问答

我正在尝试使用NodeJS + ExpressJS + Multer上传图像，但是我面临着这个问题，即我无法从Multer的uplode函数获取返回值，因此我可以在数据库上设置图像名称或抛出一个图像。错误

const express = require("express");
const router = express.Router();
const multer = require("multer");
const path = require("path");
const auth = require("../../middleware/auth");
const photoModel = require("../../models/Photo");

const upload = multer({
  storage: multer.diskStorage({
    destination: "./client/public/uploads/",filename: function(req,file,callback) {
      callback(null,"IMAGE-" + Date.now() + path.extname(file.originalname));
    }
  }),limits: { fileSize: 1000000 }
}).single("myImage");

router.post("/upload/:row",async (req,res) => {
  const id = "1";
  const { row } = req.params;
  const result = await upload(req,res,err => {
    console.log("Request ---",req.body);
    console.log("Request file ---",req.file); //Here you get file.
    /*Now do where ever you want to do*/
    // if (!err) return res.send(200).end();
    if (!err) {
      return true;
    } else {
      return false;
    }
  });
  console.log("result ",result);
  if (result) {
    const check = photoModel.SetImage(id,row);
    if (check) console.log(check);
    else {
      console.log(check);
    }
  }
});

我希望得到的结果返回true或false，但实际输出结果未定义

我确实为我的问题找到了解决之道，并将multer设置为中间件

const express = require("express");
const router = express.Router();
const multer = require("multer");
const path = require("path");
const auth = require("../../middleware/auth");
const photoModel = require("../../models/Photo");
const fs = require("file-system");

var storage = multer.diskStorage({
  destination: function(req,file,cb) {
    const { id } = req.user;
    const { row } = req.params;
    const dir = `./client/public/uploads/${id}/`;
    fs.exists(dir,exists => {
      if (!exists) {
        return fs.mkdir(dir,error => cb(error,dir));
      }
      return cb(null,dir);
    });
  },filename: function(req,callback) {
    const { row } = req.params;
    console.log(row);
    if (row === "profile_Image")
      return callback(null,"profile" + path.extname(file.originalname));
    else
      return callback(
        null,"IMAGE-" + Date.now() + path.extname(file.originalname)
      );
  }
});

// @route   Post api/profle/upload
// @desc    upload user images
// @access  Private
var upload = multer({ storage: storage });
router.post("/upload/:row",[auth,upload.single("myImage")],(req,res) => {
  const file = req.file;
  const { row } = req.params;
  const id = req.user.id;
  if (!file) {
    const error = new Error("Please upload a file");
    error.httpStatusCode = 400;
    return next(error);
  } else {
    const check = photoModel.SetImage(id,row,file.filename);
    if (check) {
      return res.json({
        success: true,errorMsg: "Your image hass been uploaded"
      });
    } else {
      return res.json({
        success: false,errorMsg: "There is an error on upload image"
      });
    }
  }
});

希望可以在将来帮助某人；）

Nodejs Multer成功获得返回值

dearyan421 回答：Nodejs Multer成功获得返回值

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