Help understanding a code
Hello there something i dont understand in johnni winsock tutrial it says accept() here in this code get info about the user but on msdn it says it just accept the connection please help me I just wanna know what accept does in this code
Code:
#include <windows.h>
#include <winsock.h>
#include <stdio.h>
#define NETWORK_ERROR -1
#define NETWORK_OK 0
void ReportError(int, const char *);
int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, LPSTR lpCmd, int nShow)
{
WORD sockVersion;
WSADATA wsaData;
int nret;
sockVersion = MAKEWORD(1, 1); // We'd like Winsock version 1.1
// We begin by initializing Winsock
WSAStartup(sockVersion, &wsaData);
// Next, create the listening socket
SOCKET listeningSocket;
listeningSocket = socket(AF_INET, // Go over TCP/IP
SOCK_STREAM, // This is a stream-oriented socket
IPPROTO_TCP); // Use TCP rather than UDP
if (listeningSocket == INVALID_SOCKET)
{
nret = WSAGetLastError(); // Get a more detailed error
ReportError(nret, "socket()"); // Report the error with our custom function
WSACleanup(); // Shutdown Winsock
return NETWORK_ERROR; // Return an error value
}
// Use a SOCKADDR_IN struct to fill in address information
SOCKADDR_IN serverInfo;
serverInfo.sin_family = AF_INET;
serverInfo.sin_addr.s_addr = INADDR_ANY; // Since this socket is listening for connections,
// any local address will do
serverInfo.sin_port = htons(8888); // Convert integer 8888 to network-byte order
// and insert into the port field
// Bind the socket to our local server address
nret = bind(listeningSocket, (LPSOCKADDR)&serverInfo, sizeof(struct sockaddr));
if (nret == SOCKET_ERROR)
{
nret = WSAGetLastError();
ReportError(nret, "bind()");
WSACleanup();
return NETWORK_ERROR;
}
// Make the socket listen
nret = listen(listeningSocket, 10); // Up to 10 connections may wait at any
// one time to be accept()'ed
if (nret == SOCKET_ERROR)
{
nret = WSAGetLastError();
ReportError(nret, "listen()");
WSACleanup();
return NETWORK_ERROR;
}
// Wait for a client
SOCKET theClient;
theClient = accept(listeningSocket,
NULL, // Optionally, address of a SOCKADDR_IN struct
NULL); // Optionally, address of variable containing
// sizeof ( struct SOCKADDR_IN )
if (theClient == INVALID_SOCKET)
{
nret = WSAGetLastError();
ReportError(nret, "accept()");
WSACleanup();
return NETWORK_ERROR;
}
// Send and receive from the client, and finally,
closesocket(theClient);
closesocket(listeningSocket);
// Shutdown Winsock
WSACleanup();
return NETWORK_OK;
}
void ReportError(int errorCode, const char *whichFunc)
{
char errorMsg[92]; // Declare a buffer to hold
// the generated error message
ZeroMemory(errorMsg, 92); // Automatically NULL-terminate the string
// The following line copies the phrase, whichFunc string, and integer errorCode into the buffer
sprintf(errorMsg, "Call to %s returned error %d!", (char *)whichFunc, errorCode);
MessageBox(NULL, errorMsg, "socketIndication", MB_OK);
}
