winsock UDP 덧셈 서버/클라이언트

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// API_test.cpp : Defines the entry point for the console application.
#include "stdafx.h"
#include <stdio.h>
#include <winsock2.h>
#pragma comment (lib, "ws2_32.lib") //수동으로 lib 추가하기
struct data
{
 int a;
 int b;
 int sum;
};
int main(int argc, char* argv[])
{
 WORD wVersionRequested;
 WSADATA wsaData;
 wVersionRequested = MAKEWORD(2,2);     //버젼 2.2 사용지정
 if(WSAStartup(wVersionRequested, &wsaData) != 0) //WSAStartup 부르기
 {
  return FALSE;
 }
 if(LOBYTE(wsaData.wVersion) != 2 || HIBYTE(wsaData.wVersion) != 2)
 {
  WSACleanup();
  return FALSE;
 }
 printf("WSAStartip success...\n");
 SOCKET sock;
 struct sockaddr_in serv_addr, clnt_addr;
 int clnt_addr_size;
 int err;
 int ec;
 struct data add;
 sock = socket(AF_INET, SOCK_DGRAM, 0);
 if(sock == INVALID_SOCKET) {
  err = WSAGetLastError();
  printf("error: %s\n", err);
  return FALSE;
 }
 
 printf("socket() success...\n");
 memset(&serv_addr, 0, sizeof(serv_addr)); //내꺼 우선 0으로 초기화
 serv_addr.sin_family = AF_INET;
 serv_addr.sin_addr.S_un.S_addr = htonl(INADDR_ANY); //서버는 INADDR_ANY사용
 serv_addr.sin_port = htons(9090);
 ec = bind(sock, (struct sockaddr *) &serv_addr, sizeof(serv_addr));
 if (ec == SOCKET_ERROR) {
  printf("bind error\n");
  return FALSE;
 }
 clnt_addr_size = sizeof(clnt_addr);
 while(1) {
  ec = recvfrom(sock, (char *)&add, sizeof(add), 0, (struct sockaddr *)&clnt_addr, &clnt_addr_size);
  if(ec == SOCKET_ERROR) {
   printf("recvfrom error\n");
   break;
  }
  printf("Receive UDP message\n");
  add.sum = add.a + add.b;
  printf("%d + %d = %d\n", add.a, add.b, add.sum);
  ec = sendto(sock, (char *)&add, sizeof(add), 0, (struct sockaddr *)&clnt_addr, sizeof(clnt_addr));
  if(ec == SOCKET_ERROR) {
   printf("sendto error\n");
   break;
  }
  printf("send UDP message\n");
 }
 closesocket(sock);
  WSACleanup();
 return 0;
}

// API_test.cpp : Defines the entry point for the console application.
#include "stdafx.h"
#include <stdio.h>
#include <winsock2.h>
#pragma comment (lib, "ws2_32.lib") //수동으로 lib 추가하기
struct data
{
 int a;
 int b;
 int sum;
};
int main(int argc, char* argv[])
{
 WORD wVersionRequested;
 WSADATA wsaData;
 wVersionRequested = MAKEWORD(2,2);     //버젼 2.2 사용지정
 if(WSAStartup(wVersionRequested, &wsaData) != 0) //WSAStartup 부르기
 {
  return FALSE;
 }
 if(LOBYTE(wsaData.wVersion) != 2 || HIBYTE(wsaData.wVersion) != 2)
 {
  WSACleanup();
  return FALSE;
 }
 printf("WSAStartip success...\n");
 SOCKET sock;
 struct sockaddr_in serv_addr;
 int serv_addr_len;
 int err;
 int ec;
 struct data add;
 add.sum = 0;
 sock = socket(AF_INET, SOCK_DGRAM, 0);
 if(sock == INVALID_SOCKET) {
  err = WSAGetLastError();
  printf("error: %s\n", err);
  return FALSE;
 }
 
 printf("socket() success...\n");
 memset(&serv_addr, 0, sizeof(serv_addr));
 serv_addr.sin_family = AF_INET;      //IPv4
 serv_addr.sin_addr.S_un.S_addr = inet_addr("127.0.0.1"); //클라는 상대방 주소를 알아야한다.
 serv_addr.sin_port = htons(9090);
 serv_addr_len = sizeof(serv_addr);
 ec = connect(sock, (struct sockaddr *) &serv_addr, sizeof(serv_addr));
 if (ec == SOCKET_ERROR) {
  printf("connect error\n");
  return FALSE;
 }
 while(1) {
  printf("input A : ");
  scanf("%d", &add.a);
  printf("input B : ");
  scanf("%d", &add.b);
  ec = sendto(sock, (char *)&add, sizeof(add), 0, (struct sockaddr *) &serv_addr, serv_addr_len);
  if(ec == SOCKET_ERROR) {
   printf("sendto error\n");
   break;
  }
  ec = recvfrom(sock, (char *)&add, sizeof(add), 0, (struct sockaddr *)&serv_addr, &serv_addr_len);
  if(ec == SOCKET_ERROR) {
   printf("recvfrom error\n");
   break;
  }
  printf("Result : %d + %d = %d\n\n", add.a, add.b, add.sum);
 }
 closesocket(sock);
 WSACleanup();
 return 0;
}