Socket.IO

问题 I am trying to log the event name and parameter for each event on my Node server. For this purpose I used io.use(function(socket, next){ // how to get event name out of socket. }); Now, I got stuck while trying to get event name and arguments. To me, it looks like common demand from API dev, so I am pretty sure there must be some way to the library to get that, I have tried to read the docs and source but I am not able to get the stuff. 回答1: The socket events needs to be handled properly,in

问题 I have a working chat application that sends messages to users one on one. See it working here: Live working site I am now trying to add feature that will let connected users select and send images from their local machines. I am able to upload the images on my server using Multer Multer ajax file upload for file upload The file gets uploaded successfully on the server each time a client select and uploads, but I am unable to send/display that saved image from server to the client properly. I

问题 I have a working chat application that sends messages to users one on one. See it working here: Live working site I am now trying to add feature that will let connected users select and send images from their local machines. I am able to upload the images on my server using Multer Multer ajax file upload for file upload The file gets uploaded successfully on the server each time a client select and uploads, but I am unable to send/display that saved image from server to the client properly. I

问题 I am building a real time energy monitoring system, where the data are from sensors. There will be new data every second. The data used will be aggregated to be rendered as charts. I have looked into real time stream processing with big amounts of data, and it lead me to Apache Kafka. Right now my web app is using Express js. I am using kafka-node library. Now currently, I manually insert new data through the command line as a producer . In my server code, I have set-up a consumer that

问题 I am building a real time energy monitoring system, where the data are from sensors. There will be new data every second. The data used will be aggregated to be rendered as charts. I have looked into real time stream processing with big amounts of data, and it lead me to Apache Kafka. Right now my web app is using Express js. I am using kafka-node library. Now currently, I manually insert new data through the command line as a producer . In my server code, I have set-up a consumer that

问题 I am trying to set up a server to receive audio from a client browser using SocketIO , then process it through Google Speech-to-Text, and finally reply back to the client with the text. Originally and ideally, I wanted to set up to function somewhat like the tool on this page: https://cloud.google.com/speech-to-text/ I tried using getUserMedia and streaming it through SocketIO-Stream , but I couldn't figure out how to 'pipe' MediaStream . Instead, now I've decided to use MediaRecorder on the

问题 I am trying to set up a server to receive audio from a client browser using SocketIO , then process it through Google Speech-to-Text, and finally reply back to the client with the text. Originally and ideally, I wanted to set up to function somewhat like the tool on this page: https://cloud.google.com/speech-to-text/ I tried using getUserMedia and streaming it through SocketIO-Stream , but I couldn't figure out how to 'pipe' MediaStream . Instead, now I've decided to use MediaRecorder on the

问题 is it possible to reuse a socket.id or use it multiple times? Let's assume a user views multiple pages of the same site in different browser tabs. I want to use a single socket.id, socket to handle them all. If a user receives a notification it should popup on all tabs with a single socket.emit. 回答1: You can't reuse Socket.IO connection IDs since they are created during the client-server handshake, but there are alternative methods. I don't have any examples, but you can modify the Socket.IO

问题 Is it possible to upload image from client to server with socket.io? 回答1: The WebSocket spec states that WebSockets should be able to send binary data as an ArrayBuffer, however this is not well supported by browsers. Socket.io limits you to sending strings, but you can send Base64 encoded data. So use the canvas toDataUrl() method to get an image as base64 and you're all set. Here's a great article on the subject. 回答2: I would suggest using something like File Stack https://www.filestack.com

问题 Is it possible to upload image from client to server with socket.io? 回答1: The WebSocket spec states that WebSockets should be able to send binary data as an ArrayBuffer, however this is not well supported by browsers. Socket.io limits you to sending strings, but you can send Base64 encoded data. So use the canvas toDataUrl() method to get an image as base64 and you're all set. Here's a great article on the subject. 回答2: I would suggest using something like File Stack https://www.filestack.com