C++ :: How To Make Two Clients Apps Communicate With Each Other Through Server
May 12, 2013
I've coded this client/server application and it works fine becuase a client can send a message to the server, so is the server to the client and mutiple clients can be connected to the server at the same time. But my problem is that I want two client to be able to communication with each other through the server. What I don't know how to do is to relay a message in the server from one client to the other. Is there a way to do this? By the way this is a chat application i'm creating.
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Oct 19, 2014
Basically i want to make a chat application , but in this application i want to have a CENTRAL SERVER , by this SERVER all clients communicate with each other.
Suppose there are 2 Clients , if C1 wants to send message to C2 ,first message will sent to SERVER then SERVER will check if C2 is online if he online then message will be delivered to him else SERVER will store message in a buffer when C2 gets online SERVER will deliver message to him.
Basically here i want to do implement INDIRECT COMMUNICATION between different all clients through SERVER...
clients could be on other computers and server on other computer and connect to SERVER through IP ADDRESS.
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Jun 16, 2013
My problem is that I've created a Client and Server program in which they communicate. The Client is an SDL Application that allows you to play as a movable character IF YOU ARE CONNECTED TO THE SERVER. If not, You're unable to play. THIS WORKS!
However, Only one client is able to play on my server?? Anyone elses' window freezes and they are not allowed to play (As if not connected to the server). Here is my server code.
Code:
#include <iostream>
#include <winsock2.h>
#include <vector>
#include <process.h>
#include "Included/pthread.h"
#define MAX_THREADS 5
bool gamerunning = true;
[Code] ....
I'm having troubles allowing more than one client to play on the server.
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Feb 1, 2014
So I've just been messing with enet trying to figure out how to make a server and client for a game. I'm having problems whenever the server receives something from a client. For now I'm just trying to send it to all the clients for them to draw the other player, but for some reason whenever I try to an error message comes up saying a breakpoint has been triggered. I don't know why it is happening. This is the code that is giving me problems.
for (unsigned int i = 0; i < peers.size(); i++)
enet_peer_send(peers[0], 0, event.packet);
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Jan 1, 2015
I'm working a personal project where I have two applications namely Server, Client. when Server is started, it continuously transmits data. When Client is opened, it is ready to consume the data and display it.
I will put both .exe files in a shared location (LAN). Therefore Sever and Client will be launched from different machines. When I searched for articles that teach how to establish communication between the two, I was offered with choices like NamedPipes, WCF, Polling etc.. I'm not sure whether they will work in a LAN based environment.Also are there any other means of establishing communication?
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Jul 2, 2014
Here is what I've got so far:
// build:
// clang++ -g -std=c++11 -Wall main.cpp -o main
// main.cpp
#include <iostream>
#include <thread>
#include <vector>
void pt_ssleep(const int delay);
[Code]...
I need oes object to send some data back to oms object asynchronously and to insert those data into numbers container.
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Jun 18, 2014
I have a device that have some communication protocols and it will respond and send some specific data when somebody communicates with the device. I tried to build a C code that will send those protocols to the device and then store those sending data. Now I don't understand that how to send those commands. Other things than that I can manage with the file handling programming.Is there any predefined function using which it will send some specific data or something like that??
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Apr 14, 2013
I'm still having troubles connecting multiple clients to my server.To break down what I have going:I have a server that is supposed to accept multiple clients.. Currently, It works with one person.While the server is running, One person is allowed to play the game (While connected to the server). If the server is down, the player cannot play (This shows that the server and client responde and work).
However, While the server is running and the client joins, the first player is allowed to play. Everyone else's window goes black and says "Not Responding" (Like any other game in which isn't working).While these players are in "Not Responding", It still says the client has connected onto the server (But they're not able to play?).My client code is working perfectly, But i'm having troubles accepting multiple clients onto my server.
#include <iostream>
#include <winsock2.h>
#include <vector>
#include <process.h>
#include "Included/pthread.h"
//Some things i'm using or will be using in the future
[code]......
I had set notes by things to tell what they do!
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Jun 13, 2014
I am running a little business on the side, any program I could use that will show me the balances of clients after withdrawals, deposits. For example, if i had a data file like this :
Code:
e 5 Elden
c 3 Felipe 55342.51415
e 3 Leonardo
e 1 Yong
[Code] ....
Lines beginning with 'e' will have an integer employee ID and an employee name.
Lines beginning with 'c' will have an integer customer ID, customer name, and a floating point account balance.
Lines beginning with a 't' will have a customer ID, employee ID, a 'w' or 'd' representing withdrawal or deposit,
and a floating point transaction amount.
Now, obviously the program doesn't have to be exactly like this but something along these lines.
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Nov 11, 2013
I'm currently in the middle of designing a program for some project. one part of the program is to send reminding SMS messages to the employees.
I have already subscribed to a SMS provider that has SMS integration - API. But now I'm wondering how will I be able connect to the SMS server and be able to send messages?
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Jul 4, 2014
I cant seem to get it to write out the correct size to the .gif file,the original is 3kb but the new one i write to finishs with 1kb.
Code:
cout << "Connected"<< endl;
std::string sendbuffer = "GET /apache_pb.gif HTTP/1.1
"
"Host: 192.168.1.4
";
// std::string buffer2 = "GET /apache_pb.gif HTTP/1.1
Host: 192.168.1.4
[Code] ......
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May 30, 2013
I need to create a client and server program. The client will have a GUI that will display all the available servers (since more than one will be running) in a list box.
I’m guessing a TCP connection will be the best method here, but how will the client find the servers to connect to? I won’t know the IP address of the server because anyone could take the server program and run it on their computer and the client would have to find it.
Is there some way to make the server send some kind of signal that only the client application will be to connect to? So the server will be sending out a signal, the client finds the signal and connects to the server. Is this possible?
i also need to be able to store the IP address the client selects so when the client application is run again it will automatically connect to the server that was stored.
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Feb 21, 2013
I need to connect and manipulate a DB in SQL Server 2008, but need to have high performance too, so, I want to develop an class in C++ that connect direct to DBMS, in a low level, without using ADO, ODBC or OLEDB.
I found this API [URL] .... which proposes to do exactly what I want, but I need to develop it by myself.
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Apr 28, 2014
I need the code for multithreaded server and client code. one server and two or more client connect to server.
Without fork(),semaphore(),etc
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Nov 28, 2013
I know this question must have been asked before, but the problem that I am facing is that I am using a library PoDoFo to parse PDF files. It seems that it is only compatible with C++.
Now I want the application to be web-based. That is, the user uploads a PDF file on the server, the server parses it and the parsed content is then sent back to the user.
Is such a thing possible with C++, or maybe any good work-arounds? Or should I look at server-side scripting languages like PHP and their respective libraries?
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Dec 1, 2014
I am writing a very basic database in C++ and I am accessing the data from a web browser. I am using the opensource Mongoose web server code....
I have an issue...
The way the DB works is this: on starting, the DB loads a json file of all of the data into it. I have a class called DatabaseLoader that does this - it is the class that gets rewritten depending on the data structure of the json.
This is passed to vectors (vector<Node*> and vector<Edge*>) as references from Graph object.
Once the DatabaseLoader has finished it can be destroyed and any memory allocated objects it created (except the ones in those two vectors).
From then on, the Graph object is in charge of all of the elements in the database that are stored in the two vectors. When the user browses to htpp://127.0.0.1:8000 they see the json representing each object in the vectors.
All good so far....
However, when I repeatedly hit refresh in my browser (and call me insane...) at quite a fast speed I get this error:
Code:
main(29855,0x7fff76763310) malloc: *** error for object 0x7f98b2829408: incorrect checksum for freed object - object was probably modified after being freed.
*** set a breakpoint in malloc_error_break to debug
[1] 29855 abort ./main testing.json
It seems to me this would be if I tried to "delete" and object twice, or if one of my objects was overwriting memory somewhere. However I am not recreating anything, I am just looping over the vectors and printing out the content. When I refresh slowly, I dont see this happen - i did it quite a lot of times, but when I do it fast I think it is happening.
So is there any possibility of me hitting the c++ web server to quickly and it is trying to process the data twice, causing some sort of memory error - i.e do I need to implement threading or something??
I can paste code, but there is quite a lot now....
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Oct 1, 2012
I managed to upload a file to a remote server with below code:
Code:
// Get the object used to communicate with the server.
FtpWebRequest request = (FtpWebRequest)WebRequest.Create("ftp://kasunl.worlditsme.com/voo.txt");
request.Method = WebRequestMethods.Ftp.UploadFile;
[Code]....
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Mar 8, 2013
I just started to work on a project which is 'Body Area Network'.
What I need to do is to take data from body with some sensor nodes and send it to mobile which would further send the data to a remote server, and I need to add some security (encryption/decryption) on the data.
So I want to know how to send data from mobile after encrypting it to the server and then decrypt it back(on server side).
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Nov 11, 2013
I'm currently in the middle of designing a program for some project. one part of the program is to send reminding SMS messages to the employees.
I have already subscribed to a SMS provider and they gave me an access to a control panel (aspx). But now I'm wondering how will I be able connect to the SMS server and be able to send messages?
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Sep 2, 2013
I'm building a client server which is communicating.I am trying to use the function recvfrom, but have several bugs, so I might have the recvfrom function in the wrong part of my code.
Code:
int talk_with_server(int fd) {
printf("Test.
");
char buf[LEN];
int n = read(fd, buf, LEN);
[Code]....
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Sep 1, 2013
I have to make a server-client file transfer using UDP . I have created a basic server which receives message sent by client . That's all. Now comes the major part :-
1. The message sent by client is the name of file
.2. Now the server checks whether there exists this file or not .
3. If there exists it sends the file to the client and it also keeps the count of the number of requests of file made by the client . Here is the Server Code
Code:
#include<sys/socket.h>
#include<arpa/inet.h>
#include<stdio.h>
#include<unistd.h>
#include<fcntl.h>
#include<sys/types.h>
#include<string.h>
}
[code]...
The server reads the data from file and writes into it and send to the client , On the other end client receive the data and make duplicate of this file and write into it. But on compiling it gives error in reading the file.
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Nov 1, 2014
I'm trying to find a way to create and amend a database using the SQL server. How to do this. I just know it's included with the VS Express package.
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Feb 25, 2013
I was wondering if i had to say simply retrieve data from a server whether it be simple plain text for variables or download whole files (FTP), what would be the best method for this? I would imagine there is a pretty big difference between retrieving text and downloading files but im just wondering what the best thing would be to research for both.
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May 30, 2014
First of all i create single server single client program and then using thread i make multiple client to connect to server.
while(true){
csock = (int*)malloc(sizeof(int));
if(nClient<=maxClient){
if((*csock = accept( hsock, (SOCKADDR*)&sadr, &addr_size))!= INVALID_SOCKET ){
[Code].....
The clients send message to the server and server echo back the message to that particular client. But i want that the server will echo back ones's message to all clients. Suppose 5 clients are connected to the server. So whenever one client send a message to the server, the server will send that message to all 5 clients.
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Oct 9, 2014
I have loads of movies on DVD and they are all on my media server, but the media server doesn't actually allow streaming to be done, the movies are just stored in a folder on the desktop.
My goal would be able to host all my movies on my LAN server, then build an application to run on a windows based PC at home, not over the Internet just over LAN. For example, say the server I have at home had all the movies in a folder on the desktop, then when I start the client on another PC or laptop in my house, I could view all the movies, choose which one and then stream it to that client PC. I am using C#.NET WPF visual studio.
Maybe I could use something like VLC player to play the movies but I would want to build an client application to view the movies and search for them on the server where the movies are stored. Also I know there are other media streaming programs out there but I want to develop my own one for my uses.
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Feb 27, 2014
I have a problem with this work. It is that when the server send some data to the client it send them correctly but when they arrive to the client all the info are changed and i don't know why, because i print them before the send and they are right, but after they arrive to the client the data doesn't be the same.
here it is the server and client's code. In the code there are some italian words, but there are only constant, so there is a real problem to understand the code.
Server
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <stdbool.h>
#define FLUSH while(getchar()!='
[code]....
the problem is in the line 136 of the server and on the line 203 of the client
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