socket.io /连接上的参数

Question

在我的node.js/Express.js应用程序中,我需要使用socket.io连接传递参数(在另一篇文章中看到).

在客户端,我有类似的东西:

编辑

var socket = io.connect('/image/change', {query:"name=my_img_name"});
var siofu = new SocketIOFileUpload(socket);

siofu.listenOnInput(document.getElementById("change_image_inpt"));

在服务器端:

编辑

io.of('/image/change')
  .on('connection', function (socket) {
  console.log('log input param : ' + socket.handshake.query.name);
});

但是在控制台中什么都没有

还有另一种方法可以实现吗？

EDIT2

这是客户端的完整代码:

$(document).ready(function() {

// icon_action_modal
$('.icon_actions').on('click', function() {
    // set icon preview
    $('#icon_action_modal_icon_preview').html('<img src="/upload/icon/' + $(this).data('icon') + '.png" />');

    // set icon to delete
    $('#icon_name').val($(this).data('icon'));

    // set Change icon socket
    var socket = io.connect('/icon_sets/change', {query:"name=my_img_name"});
    var siofu = new SocketIOFileUpload(socket);

    siofu.listenOnInput(document.getElementById("change_icon"));

    // Do something when a file is uploaded
    siofu.addEventListener("complete", function () {
        $('.overlay').hide();
    });

    // display loader window
    socket.on('displayOverlay', displayOverlay);

    // display
    socket.on('displayIconImage', function (data) {
        $('#iconset_render').append('<div class="icon"><img src="' + data.path + '" /></div>');
    });

    socket.on('setIconsetArray', function (data) {
        var iconset = ($('#iconset_array').val()) ? JSON.parse($('#iconset_array').val()) : [];

        iconset.push(data.iconName);

        $('#iconset_array').val(JSON.stringify(iconset));

        deleteIcon($('#icon_name').val());

        // close modal
        $('#icon_action_modal').modal('hide');
    });

});

$('#icon_action_modal_delete_icon').on('click', function() {
    deleteIcon($('#icon_name').val());

    // close modal
    $('#icon_action_modal').modal('hide');
});

}); // end document.ready

以及服务器端的完整代码:

io.of('/icon_sets/change')
  .on('connection', function (socket) {
    console.log('log input param : ' + socket.handshake.query.name);
    functions.socketImageTransfer(socket, 'icon', 65, 65);
});

具有以下socketImageTransfer功能:

module.exports.socketImageTransfer = function(socket, type, width, height, name) {

var socketioFileUploadServer    = require('socketio-file-upload');   // upload files by socket
var config                      = require(__dirname + '/config/config.json');
var easyimg                     = require('easyimage');                 // crop - resize image
var fs                          = require('fs');                        // file system access

// Make an instance of socketioFileUploadServer and listen on this socket:
var uploader = new socketioFileUploadServer();
uploader.dir = config.tmpDir;
uploader.listen(socket);

// Do something when a file is saved:
uploader.on('saved', function (event) {

    console.log('Original ' + type + ' saved');

    // resize and rename image with a unique id
    var newName;

    if (!name) {
        newName = Math.random().toString(36).substr(2, 9) + '_' + type + '.png';
    } else {
        newName = name;
    }

    var fileName = event.file.name.replace(/ /g, '_');

    easyimg.rescrop({src: config.tmpDir + fileName, dst: config.uploadDir + type + '/' + newName, width: width, height: height}, function (err, image) {

        if (err) return console.log(err);

        console.log(type + ' resized and cropped: ' + image.width + ' x ' + image.height);

        // image is uploaded - resized - croped, now display it
        socket.emit('display' + ucfirst(type) + 'Image', {path: '/upload/'+ type + '/' + newName});

        // remove original from file system
        fs.unlink(config.tmpDir + fileName, function () {
            if (err) throw err;
            console.log('Original ' + type + ' removed');
        });

        // additionnal action
        switch(type) {
            case 'icon':
                // send path to generate iconset_json
                socket.emit('setIconsetArray', {iconName: newName});
                break;
        }

    });

});

uploader.on('start', function (event) {
    console.log('Client start upload');
    socket.emit('displayOverlay');
});

// Error handler:
uploader.on('error', function (event) {
    console.log("Error from uploader", event);
});

};

感谢您的帮助

Answer 1

就在这里.

1)query是一样GET的参数,所以更换"param:value"用"param=value"(如果你想传递多个参数,做它,你通常做网址:param=value&some_other_param=test)

2)有一个更简单,更可靠(因为没有访问handshaken对象的未定义属性的风险)的方式来获取connection处理程序内的查询参数:

console.log(socket.handshake.query.param);

编辑:

在学习完整代码后,我想我找出了导致问题的原因.问题是你可能误解了Socket.IO命名空间的主要思想.

我猜你io.connect在一个页面内有多个Socket.IO连接(调用),对吗？通常单个连接就足够了.你的错误是你打电话io.connect给鼠标事件,但是你应该打电话一次document.ready,然后再打电话emit.

看一下下面的代码(客户端):

$(document).ready(function() {
    var socket = io.connect('', {query: 'name=something'});

    // [...]

    socket.on('some_event_from_server', function(data, cb) {});

    // [...]

    $('#someButton').click(function() {
        socket.emit('markers_add', {some: 'data'});  //send `markers_add` message to server within main namespace
    });

    $('#someOtherButton').click(function() {
        socket.emit('icon_sets_add', {some: 'thing'}, function(response) {
            //server may response to this request. see server side code below
        });
    });
});

服务器端代码:

io.on('connection', function(socket) {  //connection handler of main namespace
    socket.on('markers_add', function(data) { /* ... */  });
    socket.on('icon_sets_add', function(data, cb) {
        // do something
        cb({some: 'response'});
    });

    // [...]

    socket.emit('some_event_from_server', {});  //server sends a message to a client

    //BTW, now it should be OK:
    console.log(socket.handshake.query.name);
});

如果你有一个命名空间,它应该工作.我实际上不知道它是否是Socket.IO的错误或者是由于命名空间的使用不当造成的,但修改代码只能创建一个命名空间应该可以解决问题.因此,在您的情况下,您根本不必在握手时传递查询参数.实际上,如果您想让您的应用更安全,您必须使用查询参数.请参阅http://wlkns.co/node-js/socket-io-authentication-tutorial-server-and-client/(对于Socket.io 0.9)

希望我的回答可以帮到你.祝好运!

Answer 2

这就是我所做的.

客户

var socket = io.connect('http://localhost:8890',{ query: "foo=bar" });

服务器

io.on('connection', function (socket) {
  console.log(socket.handshake.query['foo']);
}); 

Answer 3

2021 年（socket.io 版本 4）

// client.js

const socket = io('https://195.174.3.104:3000', { query: { myParam: 'myValue' } });

// server.js

io.on("connection", (socket) => console.log(socket.handshake.query.myParam);  // myValue

来源： https: //socket.io/docs/v4/client-initialization/#query