简易TCP服务端与客户端

服务端

#define WIN32_LEAN_AND_MEAN
#define _WINSOCK_DEPRECATED_NO_WARNINGS
#include<Windows.h>
#include<WinSock2.h>
#include<stdio.h>
#pragma comment(lib, "ws2_32.lib")

int main()
{
	// 启动windwos dsocket2.x环境
	WORD ver = MAKEWORD(2, 2);
	WSAData data;
	int statut = WSAStartup(ver, &data);

	//建立一个socket
	SOCKET _sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
	//bind 绑定用于接受客户端连接的网络端口
	sockaddr_in _sin = {};
	_sin.sin_family = AF_INET;
	_sin.sin_port = htons(4567);
	_sin.sin_addr.S_un.S_addr = INADDR_ANY;/*inet_addr("127.0.0.1");*/
	if (SOCKET_ERROR == bind(_sock, (sockaddr*)&_sin, sizeof(_sin)))
	{
		printf("bind绑定失败...\n");
	}
	else
	{
		printf("bind绑定成功!\n");
	}
	//listen 监听网络端口
	if (SOCKET_ERROR == listen(_sock, 5))
	{
		printf("listen失败...\n");
	}
	else
	{
		printf("listen成功...\n");
	}
	//accept 接受等待客户端连接
	sockaddr_in clientAddr = {};
	int addrlen = sizeof(sockaddr);
	SOCKET _cSock = INVALID_SOCKET;

	char msgBuf[] = "hello,server!";
	int msgBufLen = strlen(msgBuf);
	while (true)
	{
		_cSock = accept(_sock, (sockaddr*)&clientAddr, &addrlen);
		if (INVALID_SOCKET == _cSock)
		{
			printf("接收到无效客户端SOCKET...\n");
		}
		printf("新客户端加入 IP: %s \n", inet_ntoa(clientAddr.sin_addr));
		//send 向客户端发送一条数据

		send(_cSock, msgBuf, msgBufLen + 1, 0);
	}
	//关闭套接字 closesocket
	closesocket(_sock);

	// 清除windows socket环境
	WSACleanup();
	return 0;
}

客户端

#define WIN32_LEAN_AND_MEAN
#include<Windows.h>
#include<WinSock2.h>
#include<stdio.h>

#pragma comment(lib, "ws2_32.lib")
int main()
{
	// 初始化windows socket2.x环境
	WORD ver = MAKEWORD(2, 2);
	WSADATA data;
	WSAStartup(ver, &data);

	//建立一个socket
	SOCKET _sock = socket(AF_INET, SOCK_STREAM, 0);
	if (INVALID_SOCKET == _sock)
	{
		printf("socket创建失败...\n");
	}
	//连接服务器 connect
	sockaddr_in _sin = {};
	_sin.sin_family = AF_INET;
	_sin.sin_port = htons(4567);
	_sin.sin_addr.S_un.S_addr = inet_addr("192.168.0.2");
	int ret = connect(_sock, (sockaddr*)&_sin, sizeof(sockaddr_in));
	if (SOCKET_ERROR == ret)
	{
		printf("connect连接失败...\n");
	}
	else
	{
		printf("connect连接成功...\n");
	}
	//接收服务器 recv
	char recvBuf[256] = {};
	int nLen = recv(_sock, recvBuf, 256, 0);
	if (nLen > 0)
	{
		printf("接收到数据: %s", recvBuf);
	}
	//关闭套接字 closesocket
	closesocket(_sock);
	getchar();
	// 清理socket环境
	WSACleanup();
	return 0;
}