C ++ Windows Socket implements the simplest C/S network communication (TCP) and socket network communication

C ++ Windows Socket implements the simplest C/S network communication (TCP) and socket network communication

1. server code:

# Include <iostream> # include <WinSock2.h> # pragma comment (lib, "ws2_32.lib") # define CONNECT_NUM_MAX 10 using namespace std; int main () {// load the socket library WSADATA wsaData; int iRet = 0; iRet = WSAStartup (MAKEWORD (2, 2), & wsaData); if (iRet! = 0) {cout <"WSAStartup (MAKEWORD (2, 2), & wsaData) execute failed! "<Endl; return-1;} if (2! = LOBYTE (wsaData. wVersion) | 2! = HIBYTE (wsaData. wVersion) {WSACleanup (); cout <"WSADATA version is not correct! "<Endl; return-1;} // create SOCKET socket serverSocket = SOCKET (AF_INET, SOCK_STREAM, 0); if (serverSocket = INVALID_SOCKET) {cout <"serverSocket = socket (AF_INET, SOCK_STREAM, 0) execute failed! "<Endl; return-1;} // initialize the SOCKADDR_IN addrSrv and addrSrv of the server address family. sin_addr.S_un.S_addr = htonl (INADDR_ANY); addrSrv. sin_family = AF_INET; addrSrv. sin_port = htons (6000); // bind iRet = bind (serverSocket, (SOCKADDR *) & addrSrv, sizeof (SOCKADDR); if (iRet = SOCKET_ERROR) {cout <"bind (serverSocket, (SOCKADDR *) & addrSrv, sizeof (SOCKADDR) execute failed! "<Endl; return-1 ;}// listener iRet = listen (serverSocket, CONNECT_NUM_MAX); if (iRet = SOCKET_ERROR) {cout <" listen (serverSocket, 10) execute failed! "<Endl; return-1;} // wait for connection _ receiver _ Send SOCKADDR_IN clientAddr; int len = sizeof (SOCKADDR); while (1) {SOCKET connSocket = accept (serverSocket, (SOCKADDR *) & clientAddr, & len); if (connSocket = INVALID_SOCKET) {cout <"accept (serverSocket, (SOCKADDR *) & clientAddr, & len) execute failed! "<Endl; return-1;} char sendBuf [100]; sprintf_s (sendBuf," Welcome % s ", inet_ntoa (clientAddr. sin_addr); send (connSocket, sendBuf, strlen (sendBuf) + 1, 0); char recvBuf [100]; recv (connSocket, recvBuf, 100, 0 ); printf ("% s \ n", recvBuf); closesocket (connSocket);} system ("pause"); return 0 ;}

 

2. client code:

# Include <iostream> # include <winsock2.h> using namespace std; # pragma comment (lib, "ws2_32.lib") int main () {// load the socket library WSADATA wsaData; int iRet = 0; iRet = WSAStartup (MAKEWORD (2, 2), & wsaData); if (iRet! = 0) {cout <"WSAStartup (MAKEWORD (2, 2), & wsaData) execute failed! "<Endl; return-1;} if (2! = LOBYTE (wsaData. wVersion) | 2! = HIBYTE (wsaData. wVersion) {WSACleanup (); cout <"WSADATA version is not correct! "<Endl; return-1;} // create a SOCKET: socket clientSocket = SOCKET (AF_INET, SOCK_STREAM, 0); if (clientSocket = INVALID_SOCKET) {cout <"clientSocket = socket (AF_INET, SOCK_STREAM, 0) execute failed! "<Endl; return-1;} // initialize the SOCKADDR_IN srvAddr and srvAddr variable of the server address family. sin_addr.S_un.S_addr = inet_addr ("127.0.0.1"); srvAddr. sin_family = AF_INET; srvAddr. sin_port = htons (6000); // connection server iRet = connect (clientSocket, (SOCKADDR *) & srvAddr, sizeof (SOCKADDR); if (0! = IRet) {cout <"connect (clientSocket, (SOCKADDR *) & srvAddr, sizeof (SOCKADDR) execute failed! "<Endl; return-1;} // receives the message char recvBuf [100]; recv (clientSocket, recvBuf, 100, 0); printf (" % s \ n ", recvBuf); // send the message char sendBuf [100]; sprintf_s (sendBuf, "Hello, This is client % s", "rabbit"); send (clientSocket, sendBuf, strlen (sendBuf) + 1, 0); // clear closesocket (clientSocket); WSACleanup (); system ("pause"); return 0 ;}

 

3. program running: