Socket-Program | C & & Java socket网络编程 学习socket 案例快速入手 | Socket library
kandi X-RAY | Socket-Program Summary
kandi X-RAY | Socket-Program Summary
C++&&Java socket网络编程 学习socket 案例快速入手
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- Main runner
- Dispatch a readable message
- Receives a socket channel
- Writes out bytes to socket
- Main thread
- On accepting a socket
- On write
- On readable
- Starts the chat server
- Start the server
- Close the selector
- Starts the server
- Start server socket
- Close the selector thread
- Starts a chat client
- Close the connection
- Start socket
- Main method for testing
- Transfer a file to another file
- Transfer a file with nio
- Main entry point
- Main loop
Socket-Program Key Features
Socket-Program Examples and Code Snippets
Community Discussions
Trending Discussions on Socket-Program
QUESTION
I am trying to understand the following code. If I have 50 connections to this server and I send data through one of these sockets, the select block with the inner loop will capture what I send and echo it back. But what happens if within a very short time-frame of the first message, I send another one? So fast that the inner loop (after select - the loop iterating over all active client sockets) doesn't finish. Will that data be thrown away? Will it be what the next select will be triggered with? What happens if I send two messages before the inner loop finishes ? Will I ever face the scenario where inside the loop iterating over all the active sockets I get more than 1 that has "activity" - i.e.: can two FD_ISSET(sd, &readfds) be true within a single iteration of the loop ?
ANSWER
Answered 2020-Nov-22 at 17:45select() is a level-triggered API, which means that it answers the question "are any of these file descriptors readable/writable now?", not "have these file descriptors become readable/writable?". That should answer most of your questions:
But what happens if within a very short time-frame of the first message, I send another one? [...] Will it be what the next
selectwill be triggered with?
It will be what the next select() will be triggered with.
What happens if I send two messages before the inner loop finishes ?
That depends on how long the messages are - TCP doesn't work in terms of messages, but in terms of a stream of bytes. The server might well read both messages in a single read(). And if it doesn't, the socket will remain readable, and it will pick them up immediately on the next select().
Will I ever face the scenario where inside the loop iterating over all the active sockets I get more than 1 that has "activity" - i.e.: can two
FD_ISSET(sd, &readfds)be true within a single iteration of the loop ?
Yes, if two clients send data at the same time (while you are out of select()), select() will report two readable file descriptors.
QUESTION
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
server.py ...ANSWER
Answered 2020-Nov-20 at 18:21You don’t really need to change anything in your code, except for the IP that the client connects to. It needs to be the server PC’s public Internet IP instead of 127.0.0.1.
If the server PC is connected directly to the Internet modem, then you are done.
Otherwise, if the server PC is behind a router or proxy, then you need to configure port forwarding on that router/proxy to forward traffic from its public WAN IP/port to the server PC’s LAN IP/port. Consult your router/proxy’s documentation for how to do that configuration.
If the router/proxy has uPNP enabled, your server code can dynamically forward the WAN IP/port to itself at runtime. See Python: Open a Listening Port Behind a Router (upnp?)
QUESTION
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:
...ANSWER
Answered 2020-Aug-24 at 07:13So after the conversations in comments and as @MarquisofLorne told to delete the line that i have written in my server side code. i.e either delete this line from server side code:
QUESTION
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:
...ANSWER
Answered 2020-Aug-20 at 06:52From the info you gave in the comments, linked with @Andreas Wenzel, @encs and @IS comments:
- You need to wait for the threads to finish. add a join function to block the main thread meanwhile the other threads are running
- use fflush() after every printf() to avoid issues related to buffering
- The server should be in Listen state before any client tries to connect. To ensure that, setup the server in the main thread, and create a pthread for everything below the accept() function.
QUESTION
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?
...ANSWER
Answered 2020-Jun-06 at 20:54The solution for establishing a connection was in wpa_cli Particularly, the commands p2p_find to discover, p2p_peers to see what found it, and p2p_connect pbc go_intent=0 to stop searching and connect to the Android host. You can see it show up as a local network with ip a. However, now I seem to be having a problem on the Android side, and the adventure continues in this question, for anyone interested.
QUESTION
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:
...ANSWER
Answered 2020-Aug-14 at 11:28The problem was that I was trying to connect to the socket from server part by using host address and port, but to access the Qemu data I had to connect to the socket using file descriptor /dev/vport3p1.
The server.c file should look something similar to this:
QUESTION
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:
I am re-purposing the code as a non-static class
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.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.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 fromclient.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
...ANSWER
Answered 2020-Jun-13 at 23:30You can create a class (non-static, I called it AsynchronousClient) that implements all the logic of the socket communication straight from the Microsoft example. The relevant additions are the 3 events (more on handling and raising events):
1) ConnectionComplete, fired when an asynchronous connection operation is completed;
2) SendComplete, fired when data (a string, in this example) is successfully sent;
3) DataReceived, fired when there is incoming data from the remote endpoint.
Basically, the class exposes 3 public methods: AsyncConnect, AsyncSend and AsyncReceive. On the 3 private callbacks the corresponding event in the list above is fired and the class using AsynchronousClient is notified of the termination of the operation.
QUESTION
I found one article for this program . (https://www.gokhan-gokalp.com/en/c-ile-asenkron-socket-programlama/)
But I have problem it is not sending information Server to Client. I have to write receive method in client side and I have to right send method in server side. They are missing. How can I implement ?
Client Side : Main program
...ANSWER
Answered 2020-May-18 at 09:00I suggest to you signalR for full duplex communication between client and server. https://docs.microsoft.com/tr-tr/aspnet/signalr/overview/getting-started/introduction-to-signalr
Also, I modified your code for ServerToClient communication, you can find it below.
In ExampleSocket.cs, define two new variables
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Install Socket-Program
You can use Socket-Program like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the Socket-Program component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .
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