TCPServer

#include <stdio.h> #include <WinSock2.h> void main() { WSADATA wsaData; SOCKET socketListen, socketClient; struct sockaddr_in serverAddr; // 네트워크를 초기화 한다. ::WSAStartup( 0x202, &wsaData ); socketClient = INVALID_SOCKET; socketListen = ::socket( AF_INET, SOCK_STREAM, IPPROTO_TCP ); if( socketListen == INVALID_SOCKET ) { printf( "Socket create error !!\n" ); return; } ::memset( &serverAddr, 0, sizeof( serverAddr ) ); serverAddr.sin_family = AF_INET; serverAddr.sin_addr.s_addr = ::htonl( INADDR_ANY ); serverAddr.sin_port = ::htons( 8600 ); if( ::bind( socketListen, ( struct sockaddr* )&serverAddr, sizeof( serverAddr ) ) == SOCKET_ERROR ) { printf( "bind failed!! : %d\n", ::WSAGetLastError() ); return; } if( ::listen( socketListen, SOMAXCONN ) == SOCKET_ERROR ) { printf( "listen failed!! : %d\n", ::WSAGetLastError() ); return; } while( 1 ) { // 접속 처리, 클라이언트는 하나만 받는다. if( socketClient == INVALID_SOCKET ) { fd_set fds; struct timeval tv = { 0, 100 }; // 0.1 초 FD_ZERO( &fds ); FD_SET( socketListen, &fds ); ::select( 0, &fds, 0, 0, &tv ); if( FD_ISSET( socketListen, &fds ) ) { struct sockaddr_in fromAddr; int size = sizeof( fromAddr ); socketClient = ::accept( socketListen, ( struct sockaddr* )&fromAddr, &size ); printf( "Accepted a client : %s\n", ::inet_ntoa( fromAddr.sin_addr ) ); } } else { // 접속이 이루어진 후에는 Echo 통신을 한다. char recvBuffer[127]; int recvBytes; recvBytes = ::recv( socketClient, recvBuffer, 127, 0 ); printf( "%d bytes received : %s\n", recvBytes, recvBuffer ); ::send( socketClient, recvBuffer, recvBytes, 0 ); // 통신이 끝난 후에는 클라이언트의 접속을 해제한다. ::shutdown( socketClient, SD_BOTH ); ::closesocket( socketClient ); socketClient = INVALID_SOCKET; } } ::WSACleanup(); }