windows socket编程 server client

socket

windows

//server.cpp
#include <stdio.h>
#include <WinSock2.h>
#define _WINSOCK_DEPRECATED_NO_WARNINGS
#pragma comment(lib,"ws2_32.lib")
#define BUF_SIZE 100
int main()
{
	//初始化dll
	WSADATA wsaData;
	WSAStartup(MAKEWORD(2, 2), &wsaData);
	//创建套接字
	SOCKET servSock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
	//绑定套接字
	sockaddr_in sockAddr;
	memset(&sockAddr, 0, sizeof(sockAddr));//每个字节都用0填充
	sockAddr.sin_family = PF_INET;//使用ipv4地址
	sockAddr.sin_addr.s_addr = inet_addr("127.0.0.1");//具体的IP地址 这里是本机地址
	sockAddr.sin_port = htons(1234);//端口
	bind(servSock, (SOCKADDR*)&sockAddr, sizeof(SOCKADDR));
	//进入监听
	listen(servSock, 20);

	//接收客户端请求
	SOCKADDR clntAddr;
	int nSize = sizeof(SOCKADDR);
	char buffer[BUF_SIZE];//缓冲区
	
	while(1)
	{
		SOCKET clntSock = accept(servSock, (SOCKADDR*)&clntAddr, &nSize);
		int strLen = recv(clntSock, buffer, BUF_SIZE, 0);//接受客户端信息
		printf("message received from client:%s\n", buffer);
		send(clntSock, buffer, strLen, 0);//原样发回
		closesocket(clntSock);//关闭本次连接
		memset(buffer, BUF_SIZE, 0);//重置缓存区
	}
	

	//关闭套接字
	closesocket(servSock);
	//中止DLL使用
	WSACleanup();

	return 0;


}

//client.cpp
#include <stdio.h>
#include <stdlib.h>
#include <WinSock2.h>
#pragma comment(lib,"ws2_32.lib")
//加载ws2_32.dll
#define BUF_SIZE 100
int main()
{
	//初始化DLL
	WSADATA wsaData;
	WSAStartup(MAKEWORD(2, 2), &wsaData);

	

	//向服务器发起请求
	sockaddr_in sockAddr;
	memset(&sockAddr, 0, sizeof(sockAddr));//每个字节都用0填充
	sockAddr.sin_family = PF_INET;//使用ipv4地址
	sockAddr.sin_addr.s_addr = inet_addr("127.0.0.1");//具体的IP地址 这里是本机地址
	sockAddr.sin_port = htons(1234);//端口
	char bufSend[BUF_SIZE] = { 0 };//发送缓冲区
	char bufRecv[BUF_SIZE] = { 0 };//接受缓冲区
	while (1)
	{
		//创建套接字
		SOCKET sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
		connect(sock, (SOCKADDR*)&sockAddr, sizeof(SOCKADDR));


		printf("input your message:");
		gets_s(bufSend);
		send(sock, bufSend, BUF_SIZE, 0);
		//接受服务器传回的数据

		recv(sock, bufRecv, BUF_SIZE, 0);
		//输出接收到的数据
		printf("Message from server:%s\n", bufRecv);
		memset(bufSend, 0, BUF_SIZE);
		memset(bufRecv, 0, BUF_SIZE);
		closesocket(sock);
	}
	
	WSACleanup();
	system("pause");
	return 0;
}

在socket使用域名

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

int main()
{
	//加载动态库DLL
	WSADATA wsaData;
	WSAStartup(MAKEWORD(2, 2), &wsaData);
	//域名解析
	struct hostent* host = gethostbyname("www.baidu.com");
	if(!host)
	{
		puts("Get IP address error!");
		system("pause");
		exit(0);
	}
	//别名
	for (int i = 0; host->h_aliases[i]; i++)
	{
		printf("Aliases %d:%s\n", i + 1, host->h_aliases[i]);
	}
	//地址类型
	printf("Address type:%s\n", (host->h_addrtype==AF_INET)?"AF_INET":"AF_INET6");
	for (int i = 0; host->h_addr_list[i]; i++)
	{
		printf("IP addr %d: %s\n", i + 1, inet_ntoa(*(struct in_addr*)host->h_addr_list[i]));
	}
	system("pause");
	return 0;
}