C project

jaarius

hello all

i have a client/server SMS project to do in C. basically one computer is the server and two computers are the clients. any ideas? i have a few things im playing around with but any help would be appriciated.

jaz?

Rev Hellfire

I'd write the 'server' code aqnd deploy on the server and then do the 'client' code and deploy it on the clients. Also I'd only do one client program and run the same code on the two client, rather than write two apps for each client.

If you need any more help, dont hesitate to ask.

kayos

Originally posted by Rev Hellfire
I'd write the 'server' code aqnd deploy on the server and then do the 'client' code and deploy it on the clients. Also I'd only do one client program and run the same code on the two client, rather than write two apps for each client.

If you need any more help, dont hesitate to ask.

roffle please put a warning on posts like that my boss is looking at me after bursting out in the middle of the office while reading this

Back on topic what OS? If its windows check out winsock me thinks. Or you could be really fancy and type the following in the cmd line

net send <pc name> "<message>"

kayos

Baz_

smartarses

GoneShootin

yes you guys are proper meanies

as you shoud know by now jaarius, either ask a SPECIFIC question or get smartasre replys.

tho i enjoyed HellFires post, most entertaining

Trojan

rotfl!

I'm with Kayos on this one - you should have a posted a warning

Mebe should be moved to Humour

Al.

jaarius

using WinNT for this. im doing the server end and i will be using winsock. when we asked about netsend we were greeted with the frowning of a lifetime. i have never used winsock before and will be doinng some on-line tutorials.

what i would like is examples. i been looking on the web for sample code but no joy. im not looking to cut and paste this or anything but some sample code could point me in the right example.

yes goneshootin... i should know better. damn my eyes!

jaz?

Trojan

http://www.google.com/search?hl=en&ie=ISO-8859-1&oe=ISO-8859-1&q=windows+c+sockets+example

91k hits...

check your development environment help - some of them have tonnes of examples (even Visual Studio).

Al.

V3n37

This is a code for a very simple socket server

// Compile and link with wsock32.lib
//
// Pass the port number that the server should bind() to
// on the command line. Any port number not already in use
// can be specified.
//
// Example: Server 2000
//

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

// Function prototype
void StreamServer(short nPort);

// Helper macro for displaying errors
#define PRINTERROR(s) \
fprintf(stderr,"\n%: %d\n", s, WSAGetLastError())

////////////////////////////////////////////////////////////

void main(int argc, char **argv)
{
WORD wVersionRequested = MAKEWORD(1,1);
WSADATA wsaData;
int nRet;
short nPort;

//
// Check for port argument
//
if (argc != 2)
{
fprintf(stderr,"\nSyntax: server PortNumber\n");
return;
}

nPort = atoi(argv[1]);

//
// Initialize WinSock and check version
//
nRet = WSAStartup(wVersionRequested, &wsaData);
if (wsaData.wVersion != wVersionRequested)
{
fprintf(stderr,"\n Wrong version\n");
return;
}


//
// Do the stuff a stream server does
//
StreamServer(nPort);


//
// Release WinSock
//
WSACleanup();
}

////////////////////////////////////////////////////////////

void StreamServer(short nPort)
{
//
// Create a TCP/IP stream socket to "listen" with
//
SOCKET listenSocket;

listenSocket = socket(AF_INET, // Address family
SOCK_STREAM, // Socket type
IPPROTO_TCP); // Protocol
if (listenSocket == INVALID_SOCKET)
{
PRINTERROR("socket()");
return;
}


//
// Fill in the address structure
//
SOCKADDR_IN saServer;

saServer.sin_family = AF_INET;
saServer.sin_addr.s_addr = INADDR_ANY; // Let WinSock supply address
saServer.sin_port = htons(nPort); // Use port from command line

//
// bind the name to the socket
//
int nRet;

nRet = bind(listenSocket, // Socket
(LPSOCKADDR)&saServer, // Our address
sizeof(struct sockaddr)); // Size of address structure
if (nRet == SOCKET_ERROR)
{
PRINTERROR("bind()");
closesocket(listenSocket);
return;
}

//
// This isn't normally done or required, but in this
// example we're printing out where the server is waiting
// so that you can connect the example client.
//
int nLen;
nLen = sizeof(SOCKADDR);
char szBuf[256];

nRet = gethostname(szBuf, sizeof(szBuf));
if (nRet == SOCKET_ERROR)
{
PRINTERROR("gethostname()");
closesocket(listenSocket);
return;
}

//
// Show the server name and port number
//
printf("\nServer named %s waiting on port %d\n",
szBuf, nPort);

//
// Set the socket to listen
//

printf("\nlisten()");
nRet = listen(listenSocket, // Bound socket
SOMAXCONN); // Number of connection request queue
if (nRet == SOCKET_ERROR)
{
PRINTERROR("listen()");
closesocket(listenSocket);
return;
}

//
// Wait for an incoming request
//
SOCKET remoteSocket;

printf("\nBlocking at accept()");
remoteSocket = accept(listenSocket, // Listening socket
NULL, // Optional client address
NULL);
if (remoteSocket == INVALID_SOCKET)
{
PRINTERROR("accept()");
closesocket(listenSocket);
return;
}

//
// We're connected to a client
// New socket descriptor returned already
// has clients address

//
// Receive data from the client
//
memset(szBuf, 0, sizeof(szBuf));
nRet = recv(remoteSocket, // Connected client
szBuf, // Receive buffer
sizeof(szBuf), // Lenght of buffer
0); // Flags
if (nRet == INVALID_SOCKET)
{
PRINTERROR("recv()");
closesocket(listenSocket);
closesocket(remoteSocket);
return;
}

//
// Display received data
//
printf("\nData received: %s", szBuf);

//
// Send data back to the client
//
strcpy(szBuf, "From the Server");
nRet = send(remoteSocket, // Connected socket
szBuf, // Data buffer
strlen(szBuf), // Lenght of data
0); // Flags

//
// Close BOTH sockets before exiting
//
closesocket(remoteSocket);
closesocket(listenSocket);
return;
}

Sockets is not too hard to program. I would advise you to get a good book as well. The one I used was from Bob Quinn "Windows Sockets Network Programming". Quite good.

Above code exit each time a char is received. Hopefully this will get you going.

Taken from http://www.sockaddr.com/ExampleSourceCode.html

jaarius

cheers V3n37

that is well helpful. im on my way to bigger things.

jaz?

flyz

Beej's Guide to Network programming. Tells you everything you need to know about network programming.

http://www.ecst.csuchico.edu/~beej/guide/net/

V3n37

Beej's guide is quite good actually, however is more unix biased, so if you're going to develop on NT you might want to look for another tutorial, although some concepts apply to Win32 as well as to UNIX.

flyz

Originally posted by V3n37
Beej's guide is quite good actually, however is more unix biased, so if you're going to develop on NT you might want to look for another tutorial, although some concepts apply to Win32 as well as to UNIX.

yes true, but in this case the project is being done in C.

if it was written in C++ I wouldn't have recommended it