socket.io /连接参数
在我的node.js / Express.js应用程序中,我需要通过socket.io连接传递参数(请参见另一篇文章)。
在客户端,我有类似的东西:
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:
io.of('/image/change') .on('connection', function (socket) {
console.log('log input param : ' + socket.handshake.query.name);
});
但是控制台中什么也没有。
还有另一种方法可以实现吗?
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);
});
};
感谢你的帮助
回答:
就在这里。
1)query
就像GET
参数一样,因此请替换"param:value"
为"param=value"
(如果您想传递多个参数,请像通常使用URL:一样进行操作param=value&some_other_param=test
)
2)handshaken
在connection
处理程序中获取查询参数有一种更简单,更可靠的方法(因为没有访问对象的未定义属性的风险):
console.log(socket.handshake.query.param);
学习完完整的代码后,我想我找出了导致问题的原因。问题是您可能误解了Socket.IO名称空间的主要思想。
我猜您io.connect
在一页内有多个Socket.IO连接(调用),对吗?通常,一个连接就足够了。您的错误是您调用io.connect
了鼠标事件,但是您应该在上调用一次document.ready
,然后才发出emit
声音。
看下面的代码(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);
});
如果您有一个名称空间,它应该可以工作。我实际上不知道这是Socket.IO的错误还是名称空间使用不当的结果,但是修改代码以仅创建一个名称空间应该可以解决问题。
因此,就您而言,您根本不必在握手时传递查询参数。
实际上,如果要使您的应用程序更安全,则必须使用查询参数。请参阅http://wlkns.co/node-js/socket-io-
authentication-tutorial-server-and-client/(对于Socket.io 0.9)
希望我的回答对您有所帮助。祝好运!
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