错误：解析器错误，解析了4344字节的0（Node.js） [英] Error: parser error, 0 of 4344 bytes parsed (Node.js)

问题描述

我正在尝试使用上传程序上传我的文件。我使用的代码是

I am trying to use an upload program to upload my files. The code that I use is

app.post('/photos',loadUser, function(req, res) {
  var post = new Post();
  req.form.complete(function(err, fields, files) {
    if(err) {
      console.log(err);
      next(err);
    } else {
      ins = fs.createReadStream(files.file.path);
      ous = fs.createWriteStream(__dirname + '/public/uploads/photos/' + files.file.filename);
      post.filename=files.file.filename;
      post.file=files.file.path;
      util.pump(ins, ous, function(err) {
        if(err) {
          next(err);
        } else {
          post.save(function(err,docs) { 
        req.flash('info', 'information  Saved');
            res.redirect('/photos');
          });
        }
      });
    }
  });
});

当我删除loadUser方法时，一切正常，但是当我使用 loadUser 方法它给我一个错误。错误的控制台信息是：

When I remove loadUser method everything is working fine, but when I use the loadUser method it is giving me an error. The console information of the error is:

Error: parser error, 0 of 4344 bytes parsed
at IncomingForm.write (/home/darhamid/node_modules/formidable/lib/incoming_form.js:141:17)
at IncomingMessage.<anonymous> (/home/darhamid/node_modules/formidable/lib/incoming_form.js:91:12)
at IncomingMessage.emit (events.js:67:17)
at HTTPParser.onBody (http.js:121:23)
at Socket.ondata (http.js:1349:22)
at TCP.onread (net_uv.js:312:27)

该错误仅在我使用loadUser函数时引起，如果我删除loadUser Funciton一切正常。
我不知道背后的原因而且卡住了。有人可以帮我吗？

The error is caused only when i use loadUser function, if i remove the loadUser Funciton everything is working fine. I don't know the reason behind this and am stuck. Can anyone help me please?

推荐答案

你正试图在所有事情之前执行数据库操作，这会给你带来麻烦。请尝试以下代码：

You are trying to perform database operation before everything, which is creating problems for you. Try the following code:

app.post('/potos', function(req, res, next) {
  //req.form.pause();
  req.form.complete(function(err, fields, files) {
    if(err) {
      next(err);
    } else {
      ins = fs.createReadStream(files.file.path);
      ous = fs.createWriteStream(__dirname + '/public/uploads/photos/' + files.file.filename);
      var post = new Post();
      post.filename=files.file.filename;
      post.file=files.file.path;
      post.created_at = new Date();
      post.user_id = req.session.user_id;

      function postCreationFailed() {
        req.flash('error', 'Unable to Download ');
        res.render('photos/new', {
          locals: {
             post: new Post(),currentUser: req.session.user_id
          }
        });
      }

      util.pump(ins, ous, function(err) {
        if(err) {
          next(err);
        } else { 
                 console.log('\nuploaded %s to %s',  files.file.filename, files.file.path);
                 post.save(function(err) {
                   if (err)
                return postCreationFailed();
                   req.flash('info', 'photos Succesfully Uploaded');
               res.redirect('/user/photos/'+post.user_id);
                });
              }
      });
    }
  });
  req.form.on('progress', function(bytesReceived, bytesExpected){
    var percent = (bytesReceived / bytesExpected * 100) | 0;
    process.stdout.write('Uploading: %' + percent + '\r');
  });

});

祝你好运......

Good luck...

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