[Network] TCP Server/Client 예제

[TCP Server Code]

#include <stdio.h>
#include <winsock2.h>
 
int main(){
    WSADATA wsdata;
    WSAStartup(MAKEWORD(2,2), &wsdata);
 
    SOCKET servSock = socket(AF_INET, SOCK_STREAM, 0);
    SOCKADDR_IN addr;
    ZeroMemory(&addr, sizeof(addr));
    addr.sin_family = AF_INET;
    //addr.sin_addr.s_addr = htonl(INADDR_ANY);
    addr.sin_addr.s_addr = inet_addr("127.0.0.1");
    addr.sin_port = htons(9999);
 
    bind(servSock, (SOCKADDR*)&addr, sizeof(addr));
    listen(servSock, SOMAXCONN);
 
    SOCKET clntSock = accept(servSock, NULL, NULL);
    
    printf("클라이언트 접속!\n");
 
    char str[20] = "Hello Client~";
 
    send(clntSock, str, sizeof(str), 0);
 
    closesocket(clntSock);
    closesocket(servSock);
 
    WSACleanup();
    return 0;
}

[TCP Client Code]

#include <stdio.h>
#include <winsock2.h>
 
int main(){
    WSADATA wsdata;
    WSAStartup(MAKEWORD(2,2), &wsdata);
 
    SOCKET sock = socket(AF_INET, SOCK_STREAM, 0);
    SOCKADDR_IN addr;
    ZeroMemory(&addr, sizeof(addr));
    addr.sin_family = AF_INET;
    addr.sin_addr.s_addr = inet_addr("127.0.0.1");
    addr.sin_port = htons(9999);
 
    connect(sock, (SOCKADDR*)&addr, sizeof(addr));
 
    char str[20];
    recv(sock, str, sizeof(str), 0);
    printf("수신 데이터 : %s\n", str);
    closesocket(sock);
 
    WSACleanup();
    return 0;
}