Question

使用下面的代码，我可以将图像上传到mogodb一次，如果我第二次尝试收到错误。

我做了一些研究，因为写入流正在关闭NODEJS writeStream error

conn.once('open', function () {

    var gfs = Grid(conn.db, mongoose.mongo);

    app.post('/upload', function(req,res){

        form.on('part', function(part){
            if(!part.filename) return;
            size = part.byteCount;
            fileName = part.filename;
        });

        form.on('file', function(name,file){

            var tempfile = file.path;
            var origname = fileName;

            var writestream = gfs.createWriteStream({ filename: origname });

            fs.createReadStream(tempfile).on('end', function () {
                res.send('<p><h1>Upload Complete!</h1><p>');
            }).on('error', function () {
                res.send('Error, upload failed!');
            }).pipe(writestream);

        });

        form.parse(req);

    });


    app.get('/image/:id', function(req,res){

        console.log(req.params.id)
        gfs.createReadStream({_id:req.params.id}).pipe(res);

    });

});

错误消息如下所示

events.js:72
        throw er; // Unhandled 'error' event
              ^
Error: write after end
    at writeAfterEnd (C:\Users\Michael\Desktop\Chat-App\node_modules\multiparty\node_modules\readable-stream\lib\_stream_writable.js:161:12)
    at Form.Writable.write (C:\Users\Michael\Desktop\Chat-App\node_modules\multiparty\node_modules\readable-stream\lib\_stream_writable.js:208:5)
    at write (_stream_readable.js:582:24)
    at flow (_stream_readable.js:591:7)
    at _stream_readable.js:559:7
    at process._tickCallback (node.js:419:13)

所以看起来多方在我的代码中存在问题。我的问题是，如果我更改post方法以在id上运行代码，我该如何解决这个问题？

Answer 1

替换

var form = new multiparty.Form();

内

app.post('/upload', function(req,res){...});

不要在全球范围内声明var form。它应该初始化每个帖子请求

写完后，nodejs gridFS writestream错误

1 个答案: