윈도우 기반 서버, 클라이언트 예제 작성(동작함)

server.c

#include<stdio.h>
#include<stdlib.h>
#include<WinSock2.h>
#pragma comment (lib, "ws2_32.lib")

void ErrorHandling(char* message);
int main(int argc, char* argv[]) {
	WSADATA wsaData;
	SOCKET hServSock, hClntSock;
	SOCKADDR_IN servAddr, clntAddr;

	int szClntAddr;
	char message[] = "Hello World!";
	if (argc != 2) {
		printf("Usage : %s <port>\n", argv[0]);
		exit(1);
	}

	if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0)
		ErrorHandling("WSAStartup() error!");

	hServSock = socket(PF_INET, SOCK_STREAM, 0);
	if (hServSock == INVALID_SOCKET)
		ErrorHandling("socket() error");

	memset(&servAddr, 0, sizeof(servAddr));
	servAddr.sin_family = AF_INET;
	servAddr.sin_addr.S_un.S_addr = htonl(INADDR_ANY);
	servAddr.sin_port = htons(atoi(argv[1]));

	if (bind(hServSock, (SOCKADDR*)&servAddr, sizeof(servAddr)) == SOCKET_ERROR)
		ErrorHandling("bind() error");

	if (listen(hServSock, 5) == SOCKET_ERROR)
		ErrorHandling("listen() error!");

	szClntAddr = sizeof(clntAddr);
	hClntSock = accept(hServSock, (SOCKADDR*)&clntAddr, &szClntAddr);
	if (hClntSock == INVALID_SOCKET)
		ErrorHandling("accept() error");

	send(hClntSock, message, sizeof(message), 0);
	closesocket(hClntSock);
	closesocket(hServSock);
	WSACleanup();

	return 0;

}

void ErrorHandling(char* message) {
	fputs(message, stderr);
	fputc('\n', stderr);
	exit(1);
}

 

client.c

#include<stdio.h>
#include<stdlib.h>
#include<WinSock2.h>
#pragma comment (lib, "ws2_32.lib")
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> <port>\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_un.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!");

	strLen = recv(hSocket, message, sizeof(message) - 1, 0);
	if (strLen == -1)
		ErrorHandling("read() error!");
	printf("Message from server: %s \n", message);
	closesocket(hSocket);
	WSACleanup();
	return 0;

}

void ErrorHandling(char* message) {
	fputs(message, stderr);
	fputc('\n', stderr);
	exit(1);
}

 

실행 결과

server쪽 cmd 실행화면

 

client쪽 cmd 실행화면