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本文介绍了一个简单的Linux服务端程序，该程序接收新连接并发送当前时间戳后关闭连接，以及对应的Windows客户端实现，客户端接收时间戳并将其转换为可读日期时间格式。

linux服务端，在有新连接进来的时候发送4字节的时间然后关闭连接。

#include <iostream>
#include <arpa/inet.h>
#include <time.h>

#include <event2/event.h>
#include <event2/bufferevent.h>
#include <event2/buffer.h>
#include <event2/listener.h>

void listener_cb(struct evconnlistener *listener, evutil_socket_t fd, struct sockaddr *addr, int socklen, void *val)
{
    time_t now = ::time(NULL);
    int32_t be32 = htonl(now);
    struct evbuffer *buf = evbuffer_new();
    evbuffer_add(buf, &be32, sizeof(be32));
    evbuffer_write(buf, fd);
    evbuffer_free(buf);
    evutil_closesocket(fd);
}

int main()
{
    struct sockaddr_in sin;
    sin.sin_family = AF_INET;
    sin.sin_addr.s_addr = htonl(0);
    sin.sin_port = htons(5000);

    struct event_base *base = event_base_new();
    struct evconnlistener *listener = evconnlistener_new_bind(base, listener_cb, NULL, LEV_OPT_CLOSE_ON_FREE | LEV_OPT_REUSEABLE,
                                    -1, (struct sockaddr*)&sin, sizeof(sin));

    std::cout << "start..." << std::endl;
    event_base_dispatch(base);
    return 0;
}

windows客户端：

#include <iostream>
#include <assert.h>
#include <string.h>
#include <stdint.h>
#include <time.h>

#include "event2/event.h"
#include "event2/bufferevent.h"
#include "event2/buffer.h"
#include "event2/listener.h"

#include "windowsSocket.h"

const char* CONNECT_IP = "192.168.239.147";
const unsigned short CONNECT_PORT = 5000;

void read_cb(struct bufferevent *bufferEvent, void *)
{
	std::cout << "read_cb is comming..." << std::endl;
    struct evbuffer *input = bufferevent_get_input(bufferEvent);
	int32_t be32;
	evbuffer_remove(input, &be32, sizeof(be32));
	time_t val = ntohl(be32);
	struct tm t;
	::localtime_s(&t, &val);
	char buf[128] = {0};
	asctime_s(buf, &t);
	std::cout << buf << std::endl;
}

int _tmain(int argc, _TCHAR* argv[])
{
	WindowsSocket::Startup(2, 2);
    struct sockaddr_in sin;
    sin.sin_family = AF_INET;
    sin.sin_addr.s_addr = inet_addr(CONNECT_IP);
    sin.sin_port = htons(CONNECT_PORT);
    struct event_base *base = event_base_new();
	struct bufferevent *be = bufferevent_socket_new(base, -1, BEV_OPT_CLOSE_ON_FREE);
	if (!be) {
		std::cout << "bufferevent_socket_new error!" << std::endl;
		return -1;
	}

	if (-1 == bufferevent_socket_connect(be, (struct sockaddr*)&sin, sizeof(sin))) {
		std::cout << "bufferevent_socket_connect error!" << std::endl;
		return -1;
	}

	bufferevent_setcb(be, read_cb, NULL, NULL, base);
	bufferevent_enable(be, EV_READ);
    event_base_dispatch(base);
	
	WindowsSocket::Cleanup();
	system("pause");
    return 0;
}

// windowsSocket.h
#pragma once

class WindowsSocket
{
public:
	static void Startup(unsigned char loVer, unsigned char hiVer);
	static void Cleanup();

private:
	static bool s_isStarted;
};

// windowsSocket.cpp
#include "windowsSocket.h"
#include <Windows.h>

bool WindowsSocket::s_isStarted = false;

void WindowsSocket::Startup(unsigned char loVer, unsigned char hiVer)
{
	if (s_isStarted) {
		OutputDebugString(_T("WindowsSocket already initialized."));
		return;
	}

	WSAData wsaData;
	if (WSAStartup(MAKEWORD(loVer, hiVer), &wsaData)) {
		OutputDebugString(_T("Failed to initialize WindowsSocket."));
	} else {
		s_isStarted = true;
	}
}

void WindowsSocket::Cleanup()
{
	if (s_isStarted) {
		s_isStarted = false;
		WSACleanup();
	}
}