Multiple Connections to a Server

Hi, I know a little about network programming. Though I wasn't sure if the codes of a simple server-client program wouldl be the same as the codes of multiple clients connecting to a server. I'm thinking about creating a chat program wherein there is one server and several clients connecting to it. Any ideas where I can start?

Thanks in advance.. :D

Yes, that's pretty much it.
You just need to keep listening to the accept port to gather additional connections.

Hmm. I got this simple code. I used multithreading.

Code:

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#include <stdio.h>
#include <stdlib.h>
#include <windows.h>
#include <winsock.h>

DWORD WINAPI rcv(LPVOID lpParam)
{
    SOCKET sock = (SOCKET) lpParam;
    char buffer[260];
    char temp[260];
   
    while (1)
    {
        int bytesRcv = recv(sock, buffer, sizeof(buffer), 0);
       
        if (bytesRcv == 0 || bytesRcv == SOCKET_ERROR)
        {
            closesocket(sock);
            ExitThread(0);
        }
        else
        {
            memset(buffer, 0, 260);
            strcpy(temp, buffer);
            send(sock, temp, sizeof(temp), 0);
        }   
    }
}

int main(int argc, char *argv[])
{
    WSADATA wsadata;
    if (WSAStartup(MAKEWORD(2,0), &wsadata) != 0) return 0;
   
    SOCKET hSocket, hRemoteSocket;
    hSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    if (hSocket == INVALID_SOCKET) return 0;
   
    SOCKADDR_IN server, client;
    server.sin_family = AF_INET;
    server.sin_addr.s_addr = INADDR_ANY;
    server.sin_port = htons(4567);
   
    if (bind(hSocket, (SOCKADDR*)&server, sizeof(server)) != 0) return 0;
    if (listen(hSocket, SOMAXCONN) != 0) return 0;
   
    int len = sizeof(client);
    DWORD thread;
   
    while (1)
    {
        hRemoteSocket = accept(hSocket, (SOCKADDR*) &client, &len);
        if (hRemoteSocket == INVALID_SOCKET) return 0;
       
        CreateThread(NULL, 0, rcv, (LPVOID)hRemoteSocket, 0, &thread);
    }
   
    closesocket(hSocket);
    WSACleanup();
           
    return 0;
}

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My problem now is how to get the message sent by one client to all the clients connected to the server. Any ideas? :confused:
Thanks again.. ;)

> CreateThread(NULL, 0, rcv, (LPVOID)hRemoteSocket, 0, &thread);
Shouldn't you be passing the remote socket.

And some other bugs in rcv().

> My problem now is how to get the message sent by one client to all the clients connected to the server
A for loop in the server perhaps?

Quote:

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Shouldn't you be passing the remote socket.

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Uhm, I guess I'm passing the remote socket.

Quote:

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And some other bugs in rcv().

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Can you specify the bugs so I may fix it?

Quote:

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A for loop in the server perhaps?

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Okay I'll try that. Thanks.. ;)

I could, but it ought to be pretty obvious if you actually run the code.

Arg. Kinda new here.. Hehe Can't find the bug. :(

What does your memset / strcpy combination do?

Hmm. I just put that cuase cause last time when I ran the program (w/o the memset), if first input 'abcdefg' then input 'bed' the output became 'beddefg'.. That's why I put memset.

Does strcpy copy from temp to buffer, or from buffer to temp?