[Network] UDP Server/Client 예제

[UDP Server Code]

#include <stdio.h>
#include <winsock2.h>
 
int main(){
    WSADATA wsdata;
    WSAStartup(MAKEWORD(2,2), &wsdata);
 
    SOCKET sock = socket(AF_INET, SOCK_DGRAM, 0);
    SOCKADDR_IN addr;
    ZeroMemory(&addr, sizeof(addr));
    addr.sin_family = AF_INET;
    addr.sin_addr.s_addr = htonl(INADDR_ANY);
    addr.sin_port = htons(12345);
 
    bind(sock, (SOCKADDR*)&addr, sizeof(addr));
 
    char msg[30];
    SOCKADDR_IN clntAddr;
    ZeroMemory(&clntAddr, sizeof(clntAddr));
    int clntAddrSz = sizeof(clntAddr);
    recvfrom(sock,msg, sizeof(msg), 0, (SOCKADDR*)&clntAddr, &clntAddrSz);
    printf("[%s] 수신 데이터 : %s\n", inet_ntoa(clntAddr.sin_addr), msg);
 
    closesocket(sock);
 
    WSACleanup();
    return 0;
}

[UDP Client Code]

#include <stdio.h>
#include <winsock2.h>
 
int main(){
    WSADATA wsdata;
    WSAStartup(MAKEWORD(2,2), &wsdata);
 
    SOCKET sock = socket(AF_INET, SOCK_DGRAM, 0);
    SOCKADDR_IN addr;
    ZeroMemory(&addr, sizeof(addr));
    addr.sin_family = AF_INET;
    addr.sin_addr.s_addr = inet_addr("192.168.232.141");
    addr.sin_port = htons(12345);
 
    char msg[30] = "UDP test";
    sendto(sock, msg, sizeof(msg), 0, (SOCKADDR*)&addr, sizeof(addr));
 
    closesocket(sock);
 
    WSACleanup();
    return 0;
}