Socket.io没有发光价值 [英] Socket.io is not emitting value

问题描述

我在接收socket.io发出的值时遇到问题，我没有得到问题所在。这里发布的代码请帮我解决问题。

I am having problem in receiving values emitted by socket.io, I am not getting where is the problem. Here am posting the code please help me to solve the problem.

var express = require('express');
var app = express();
var http = require('http').Server(app);
var io = require('socket.io')(http);
var bodyParser = require('body-parser');
var path = require('path');
var fs = require('fs');
var spawnSync = require('child_process').spawnSync;

....

app.post('/loadImage',upload.any(),function(req, res) {
        fs.readFile('/home/pathtofile/file.json','utf8',function(err,data){
                if(err){
                    console.log(err);
                }else{
                    //console.log(data);
                    var precjson = JSON.parse(data);
                    var loaded_filename = precjson.Filename;
                    io.emit('emitfilename',{loaded_filename});
                }
            })
}
http.listen(8080,'0.0.0.0',function(){
    console.log('listening on 8080');
})

这是我收到的代码发射值：

And here is my code where I am receiving the emitted values:

    <script type="text/javascript">
    var socket = io.connect('http://localhost:8080');

      socket.on('emitfilename',function(data){
        //console.log(data);
        var li = document.createElement('li');
        var filename = document.createElement('h4');

        filename.textContent = 'File Name:' + data.filename;
        li.appendChild(filename);

        document.getElementById('filenameoutput').appendChild(li);
     });
</script>

我没有获取文件名，而是未定义。任何人都可以帮助我。

Instead of getting file name , I am getting undefined. Can any one please help me.

推荐答案

您不能使用io变量来发送数据。您可以使用刚刚连接的客户端的当前套接字来发送数据：

You can't use "io" variable to emit data. You can use current socket of the client that just connected to send data :

io.on('connection', function (socket) {
  socket.emit('news', { hello: 'world' });
  socket.on('my other event', function (data) {
    console.log(data);
  });
});

或使用 io.sockets 向所有套接字发送

Or use io.sockets to emit to all sockets

io.sockets.emit('users_count', clients);

希望它能解决您的问题！谢谢！

Hope it solve your problem ! Thanks !

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