client.cpp

网络socket编程:Client&Server

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <winsock.h>
#pragma comment(lib, "wsock32.lib")

#define SERVPORT 3333 
#define MAXDATASIZE 100 /*每次最大数据传输量 */ 

void main()
{
	WORD wVersionRequested;
	WSADATA WSAData;

	wVersionRequested = MAKEWORD(1, 1);

	if (0 != WSAStartup(wVersionRequested, &WSAData))
	{
		printf("加载套接库错误!");
		exit(1);
	}

	int sockfd, recvbytes; 
	char buf[MAXDATASIZE]; 
	struct hostent *host;
	struct sockaddr_in serv_addr; 

	if ((sockfd = socket(PF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET)
	{
		printf("创建套接字错误!");
		WSACleanup();
		exit(1);
	}

	host = gethostbyname("172.18.2.145");

	serv_addr.sin_family=AF_INET;
	serv_addr.sin_port=htons(SERVPORT);
	serv_addr.sin_addr = *((struct in_addr *)host->h_addr);

	//serv_addr.sin_addr.s_addr = inet_addr("172.18.2.145");

	if (SOCKET_ERROR == connect(sockfd, (struct sockaddr*)&serv_addr, sizeof(struct sockaddr)))
	{
		printf("连接套接字错误!");
		closesocket(sockfd);
		WSACleanup();
		exit(1);
	}

	recvbytes = 0;

	if ((recvbytes = recv(sockfd, buf, MAXDATASIZE, 0)) == -1)
	{
		printf("接受数据错误!");
		closesocket(sockfd);
		WSACleanup();
		exit(1);
	}

	buf[recvbytes] = '\0';

	printf("Received:%s", buf);

	closesocket(sockfd);
	WSACleanup();
}