[TCP/IP] 윈도우 기반 클라이언트 예제

출처 도서 : [열혈 TCP/IP 소켓 프로그래밍]

Client 

#include <stdio.h>
#include <stdlib.h>
#include <WinSock2.h>
void ErrorHandling(char* message);
int main(int argc, char* argv[])
{
	WSADATA wsaData;
	SOCKET hSocket;
	SOCKADDR_IN servAddr;
	char message[30];
	int strLen;
	if (argc != 3)
	{
		printf("Usage : %s <IP> <post> \n", argv[0]);
		exit(1);
	}
	if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0)
		ErrorHandling("WSASTartup() error!");
	hSocket = socket(PF_INET, SOCK_STREAM, 0);
	if (hSocket == INVALID_SOCKET)
		ErrorHandling("socket() error");
	memset(&servAddr, 0, sizeof(servAddr));
	servAddr.sin_family = AF_INET;
	servAddr.sin_addr.s_addr = inet_addr(argv[1]);
	servAddr.sin_port = htons(atoi(argv[2]));
	if (connect(hSocket, (SOCKADDR*)&servAddr, sizeof(servAddr)) == SOCKET_ERROR)
		ErrorHandling("connect() error!");
	if (connect(hSocket, (SOCKADDR*)&servAddr, sizeof(servAddr)) == SOCKET_ERROR)
		ErrorHandling("connect() error!");
	strLen = recv(hSocket, message, sizeof(message) - 1, 0);
	if (strLen == -1)
		ErrorHandling("read() Error");
	printf("Message form server : %s \n", message);
	closesocket(hSocket);
	WSACleanup();
	return 0;
}
void ErrorHandling(char* message)
{
	fputs(message, stderr);
	fputc('\n', stderr);
	exit(1);
}