Express.js / Multer.在onFileUploadComplete完成之前发送的响应

Express.js / Multer. Response being sent before onFileUploadComplete is complete

本文关键字：响应 js Multer onFileUploadComplete Express      更新时间：2023-09-26

我正在使用以下内容作为文件上传服务:

onFileUploadStart: function (file) {
        uploadPath = "";
        imageDimensions = null;
        console.log(file.originalname + ' is starting to upload...');
    },
onFileUploadComplete: function (file) {
        uploadPath = file.path;
        uploadPath = uploadPath.replace(/''/g,"/");
        console.log("Upload complete. " + file.fieldname + ' uploaded to  ' + file.path)
        sizeOf(file.path, function (err, dimensions) {
            if (err){
                console.log("ERROR, Can't get size of image! " + err);
                return;
            }
            else{
                imageDimensions = { 
                    width : dimensions.width,
                    height: dimensions.height
                };
                console.log("Size of image: width: " + imageDimensions.width + ". height: " + imageDimensions.height);
            }
        });
    }

和

app.post('/imageupload',function(req,res){
  upload(req,res,function(err) {
    console.log("response is being send..");
    if(err) {
        return res.end("Error uploading file.");
    }
    res.header("Access-Control-Allow-Origin", "*");
    res.header("Access-Control-Allow-Headers", "X-Requested-With");
    res.json({
        dimensions: imageDimensions,
        path: uploadPath
    });
});

});

据我所知(https://stackoverflow.com/a/30458411/2742995) onFileUploadComplete是在.post处理程序被执行之前首先处理的。但是，控制台显示:

a.jpg is starting to upload...
Upload complete. file uploaded to uploadeddata'a1235412.jpg
response is being send..
Size of image: width: 2835, height: 1654

因此，似乎在onFileUploadComplete函数的中间。post处理程序已经被执行…

我该怎么解决这个问题?

好的，我知道了。sizeOf函数是async的.....

var dimensions = sizeOf(file.path);

为同步版本

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