sockets – Page 6 – Tarik Billa

Accepting output of the socket generated by Python in MQL5

December 7, 2023 by Tarik

Please find a running example. Important element is to create byte object of the payload instead of string before you send as reply. socket object produces and ingests only bytes import socket import threading import sys def actual_work(data): print(data) return b’ACK’ def daemon(): sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) sock.bind((‘127.0.0.1’, 6666)) print(“Listening on udp … Read more

Is it safe to cast SOCKET to int under Win64?

December 6, 2023 by Tarik

The simple answer to this question is no. Take a look at the description of SOCKET values on MSDN [1]: Windows Sockets handles have no restrictions, other than that the value INVALID_SOCKET is not a valid socket. Socket handles may take any value in the range 0 to INVALID_SOCKET–1. So clearly, the API allows all … Read more

Are there any module that works like django admin in Nodejs?

December 6, 2023 by Tarik

Express Admin is very similar to how the Django admin looks. It’s really a light weight solution and it’s definitely not a framework but at least you can easily create an admin panel for your database.

What is the difference between Socket and RPC?

December 4, 2023 by Tarik

Short answer: RPC is the protocol. The socket provides access to the transport to implement that protocol. RPC is the service and protocol offered by the operating system to allow code to be triggered for running by a remote application. It has a defined protocol by which procedures or objects can be accessed by another … Read more

IPv6: Is `::’ equivalent to `0.0.0.0′ when listening for connections?

December 4, 2023 by Tarik

I believe that listening on a port on 0.0.0.0 is equivalent to listening on a port on any network adapter, at least my memory of the Windows socket API says that this is so. That is correct. 0.0.0.0 is defined as INADDR_ANY and can be used to listen on all local IPv4 adapters. It also … Read more

Scaling a chat app – short polling vs. long polling (AJAX, PHP)

December 1, 2023 by Tarik

TCP_NODELAY not found on Ubuntu

December 1, 2023 by Tarik

Did you #include <netinet/tcp.h>?

Socket and file descriptors

November 29, 2023 by Tarik

Yes, sockets are also indices into the same table as files. At least for UNIX systems (like Linux and OSX), Windows is different, which is why you can’t use e.g. read and write to receive and send data. Each process has its own “file” descriptor table.

Testing Java Sockets

November 28, 2023 by Tarik

If I was to test the code, I’d do the following. Firstly, refactor the code so that the Socket isn’t directly instantiated in the method you want to test. The example below shows the smallest change I can think of to make that happen. Future changes might factor out the Socket creation to a completely … Read more

Use socket.io inside a express routes file

November 28, 2023 by Tarik

There is a better way to do this now with Express 4.0. You can use app.set() to store a reference to the io object. Base configuration: var app = require(‘express’)(); var server = app.listen(process.env.PORT || 3000); var io = require(‘socket.io’)(server); // next line is the money app.set(‘socketio’, io); Inside route or middleware: exports.foo = function(req,res){ … Read more