Socket-Programming | This is an instant messaging application programmed in C | Socket library

I'm new to socket programming. I have developed fundamental/simple client and server application where client successfully communicates with server. Currently, both the server is on my system (local host) and client is also my system.

Now I want to somehow allow clients outside the network ( network where my system belongs to) to communicate with the server but i have no idea what to do and how to proceed. Any help would be appreciated.

Here's a smaple code taken from here

I am just trying to send some files from a socket and i am able to send those files without any interruption: also whether the size file is small or large that does not matter it sends like a charm.

But the problem in my case that is arising is the file that i sent is being corrupted, i.e. it is not playing like audio or video. I have already gone through this but it did not helped.

The code that I am using is below.

Server Side:

I am trying to create a simple socket connection of a client and a server. I wrote something very basic, following this guide.

I am using the client.c:

I want to programmatically transfer a file from a Raspberry Pi with Wi-Fi access, running Linux (client), to an Android phone (host). I'm using this link as a guide for how to set up a P2P connection on Android, but I cannot find any references to handle the client side on non-Android devices. I understand I can use this link to provide documentation on connecting the client to the host, but I have no leads on how to actually send a file with it.

Essentially, what I'd like to know is: Is there anything I can do on Linux to get the same effect as this, from the Android documentation? Am I completely misguided?

I am trying to do a simple communication between a server (running on Ubuntu from Qemu with Cortex-A53 cpu) and a client (running on CentOS from my pc), using sockets.

If I run the C++ code only from Centos (both client.c and server.c) it works fine. Same if I run both from Ubuntu. But if I start the server.c from Ubuntu and client.c from CentOS the communication doesn't work.

The C code I'm using is from this tutorial: https://www.geeksforgeeks.org/socket-programming-cc/

The Qemu command:

I have a requirement to send data asynchronously via TCP. It is a collection of strings ICollection.

I searched and found a good starting example from Microsoft (see below). The sample seems to be under .NET Framework, but I assume it applies to .NET Core as well.

What I am doing:

1. I am re-purposing the code as a non-static class

2. I would like to send a collection of strings ICollection. I know I can rewrite it to send the collection of strings in the main method. Not a problem.

3. I would like to receive a response for each message sent and do something with it. The current response is stored statically in private static String response = String.Empty;. I don't want it to be static. I want a local method variable.

4. My challenge begins from item 3.. How do I return back that response message that seems only accessible from within private static void ReceiveCallback( IAsyncResult ar )

   I do not think changing it to private static string ReceiveCallback( IAsyncResult ar ) would work. If so, how do I read it from client.BeginReceive( state.buffer, 0, StateObject.BufferSize, 0, new AsyncCallback(ReceiveCallback), state);?

I put out a 300point bounty on a very old post for a similar question I found: C# Asyn. Socket Programming. Happy to award anyone who answers here, then there.

An additional question is: Is it recommended practice to open a TCP connection, send the multiple messages, then close it? Or to open a TCP connection for each message being sent?

Microsoft Example

I am trying to learn winsock2 by following a tutorial. The problem is that the last section where it tells you about handling multiple clients, has empty code. How would this be achieved with multi-threading in a nice-mannered way?

Code: https://pastebin.com/D3L8CgAi

I am trying to make a client/server homework. I use Visual Studio 2017 and already changed the project settings that i can use sockets (Windows Socket Programming in C) but now my console always says "ERROR while creating Socket ... : No error"

This is my current code:

this maybe is a simple question but I'm trying to just read a server response using the sockets API adapting the code from Geeks for Geeks [site]1, when I try to read the data, it becomes blocked forever in the valread = read(server_fd, buffer, 2048); line, and doesn't execute any of the prints. Am I doing something wrong?