Network Programming with Windows Sockets : A Socket-Based Client

10/10/2010 3:10:42 PM
The conversion is straightforward, with several small differences.
  • Rather than locating a server using mailslots, the user enters the IP address on the command line. If the IP address is not specified, the default address is, which indicates the current machine.

  • Functions for sending and receiving messages, such as ReceiveMessage, are used but are not shown here.

  • The port number, SERVER_PORT, is defined in the header file, ClientServer.h.

Program 1. clientSK: Socket-Based Client
/* Single-threaded command line client. */
/* Reads a sequence of commands to send to a server process */
/* over a socket connection. Wait for and display response. */

#include "Everything.h"
#include "ClientServer.h"/* Defines request and response records. */

static BOOL SendRequestMessage (REQUEST *, SOCKET);
static BOOL ReceiveResponseMessage (RESPONSE *, SOCKET);

struct sockaddr_in clientSAddr;/* Client Socket address structure */

int main (int argc, LPSTR argv[])
REQUEST request;/* See clntcrvr.h */
RESPONSE response;/* See clntcrvr.h */
WSADATA WSStartData; /* Socket library data structure */
BOOL quit = FALSE;
DWORD conVal;

/* Initialize the WS library. Ver 2.0 */
WSAStartup (MAKEWORD (2, 0), &WSStartData);
/* Connect to the server */
/* Follow the standard client socket/connect sequence */
clientSock = socket(AF_INET, SOCK_STREAM, 0);
memset (&clientSAddr, 0, sizeof(clientSAddr));
clientSAddr.sin_family = AF_INET;
if (argc >= 2)
clientSAddr.sin_addr.s_addr = inet_addr (argv[1]);
clientSAddr.sin_addr.s_addr = inet_addr ("");

clientSAddr.sin_port = htons(SERVER_PORT);
conVal = connect (clientSock, (struct sockaddr *)&clientSAddr,
/* Main loop to prompt user, send request, receive response */
while (!quit) {
_tprintf (_T("%s"), _T("\nEnter Command: "));
fgets (request.record, MAX_RQRS_LEN, stdin);
/* Get rid of the new line at the end */
request.record[strlen(request.record)-1] = '\0';
if (strcmp (request.record, "$Quit") == 0) quit = TRUE;
SendRequestMessage (&request, clientSock);
if (!quit) ReceiveResponseMessage (&response, clientSock);

shutdown (clientSock, SD_BOTH); /* Disallow sends and receives */
closesocket (clientSock);
_tprintf (_T("\n****Leaving client\n"));
return 0;

While the code is written for Windows, there are no Windows dependencies other than the WSA calls.

Comment: The programs in this chapter do not use generic characters. This is a simplification driven by the fact that inet_addr does not accept Unicode strings.

Running the Socket Client

The socket server is complex with long program listings. Therefore, Run 1 shows the client in operation, assuming that there is a running server.

Run 1. clientSK: Socket Client Operation

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