Can I get a brief description of this C code to understand more.

#include "Decrypt.h"

#include

#include

#include

#include

using namespace std;

#pragma comment(lib, "WS2_32.lib")

int main()

{

WSADATA wsaData;

WORD sockVersion = MAKEWORD(2, 2); //windows web programing database version information.

SOCKET sListen = 0; //create a socket struct

sockaddr_in sin = { 0 }; //create a local socket type programmable wed address structure sin.

sockaddr_in remoteAddr = { 0 }; //create a remove socket type programmable wed address structure remoteAddr.

char szText[] = "TCP Server Demo";

int nAddrLen = 0;

nAddrLen = sizeof(sockaddr_in); //calculate the size of sockaddr_in

sin.sin_port = htons(4567); //set the server port.

sin.sin_family = AF_INET; //set the sin type

sin.sin_addr.S_un.S_addr = INADDR_ANY; //set local IP address, normally INADDR_ANY will generate init wsa of local IP address when the program start.

if (WSAStartup(sockVersion, &wsaData) != 0) //WSAStartup is for initializing and loading windows net

{

cout << "initialization failed!" << endl;

exit(0); //if fail to initialize, exit

}

sListen = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); //create a socket in local computer, use bind function to put the

//local IP address and Port to the socket object and initialize socket.

//in the web client, we use connect to initialize the socket while we use bind in web server

if (bind(sListen, (LPSOCKADDR)&sin, sizeof(sin)) == SOCKET_ERROR)

{

cout << "bind failed!" << endl;

return 0; //if fail to bind then return 0 and exit.

}

if (listen(sListen, 2) == SOCKET_ERROR) //listen is used to open the local port,2 means there can be 2 client connecting to it at the same time

{

cout << "listen failed!" << endl;

return 0;

//if fail to open the local port then return 0 and exit.

}

SOCKET sClient = INADDR_ANY;//create another socket in the server for storing the connecting instants with the clients

while (true)

{

//accept function is used for creating a TPC communication instants,

//it takes the IP address in a remote computer and a local socket as parameters to build a connection.

sClient = accept(sListen, (SOCKADDR*)&remoteAddr, &nAddrLen);

if (sClient == INVALID_SOCKET)

{

cout << "accept failed!" << endl;

continue;

}

//send function is used to send data to the client

send(sClient, szText, strlen(szText), 0);

char* buffer = new char[10240];

//create a buffer for receive data from server

int nRecv = 0; //count how many bytes received

nRecv = recv(sClient, buffer, 1024, 0); //recv is a function for counting how many bytes received from the server

generateDecryptInfor(buffer); //put the data into function for decryption

}

closesocket(sListen);

//close slisten

WSACleanup();

//release ws2_32.dll

}