前段时间一个项目需要用到高并发的服务，想着自己应该可以写一个，windwos 上使用完成端口实现，写完之后，测试感觉没什么问题，可是一上线各种各样的问题，初步怀疑是底层网路库的问题，于是决定更换网络库，使用libevent 

　　1,下载最新稳定版libevent

　　 http://libevent.org/ 目前最新稳定版本应该是 下载解压目录

　　

　　2,编译lib库

　　使用VS命令提示工具编译：

　　32位库的编译方法　　

　　cd  F:\libevent\libevent-2.1.8-stable

　　nmake /f Makefile.nmake

　　会在根目录下生成三个文件libevent_core.lib，ibevent_extras.lib，libevent.lib 

　　64位库的编译方法

　　首先修改Makefile.nmake 在LIBFLAGS=/nologo 后面加上 /MACHINE:X64  

　　cd  F:\libevent\libevent-2.1.8-stable

　　nmake /f Makefile.nmake

　　顺利的话，根目录下同样会生成一个64位的库文件，　　

　　3，使用lib库

　　新建一个lib文件夹，将上面编译好的lib文件放进去

　　新建一个Include目录，将F:\libevent\libevent-2.1.8-stable\include下的文件和文件夹copy到该目录下，F:\libevent\libevent-2.1.8-stable\WIN32-Code下的文件copy到该目录下，2个event2目录下的文件可合并一起。

　　然后，在项目工程中引用该include 和lib

#ifndef WIN32#include 
     
      # ifdef _XOPEN_SOURCE_EXTENDED#  include 
      
       # endif#include 
       
        #endif#include "event2/bufferevent.h"#include "event2/buffer.h"#include "event2/listener.h"#include "event2/util.h"#include "event2/event.h"#include 
        
         string IP = "127.0.0.1";int PORT = 9500;char * pMessage = "hello client";struct bevdata{    string ip;    int port;};static void conn_readcb(struct bufferevent *bev, void *ctx){    bevdata *pbev_data = (bevdata*)ctx;    struct evbuffer* input = bufferevent_get_input(bev);     size_t len = evbuffer_get_length(input);    printf("point = %x,len = %d",bev,len);    struct evbuffer* output = bufferevent_get_output(bev);    char msg[4096] = {
   0};    len = bufferevent_read(bev, msg, sizeof(msg) - 1);    printf("server recv data : %s:%d %s\n",pbev_data->ip.c_str(),pbev_data->port,msg);    char senddata[20];    strcpy(senddata,"i recv your data");    bufferevent_write(bev,senddata,strlen(senddata));}static void conn_writecb(struct bufferevent *bev, void *ctx){}static void conn_eventcb(struct bufferevent *bev, short what, void *ctx){    if (what & BEV_EVENT_EOF) {        printf("connection closed\n");    }    else if (what & BEV_EVENT_ERROR) {        printf("some other error\n");    }    bufferevent_free(bev);}static void signal_cb(evutil_socket_t sig, short events, void *user_data){    struct event_base *base = (struct event_base *)user_data;    struct timeval delay = { 2, 0 };    printf("Caught an interrupt signal; exiting cleanly in two seconds.\n");    event_base_loopexit(base, &delay);}static void listener_cb(struct evconnlistener *listener, evutil_socket_t fd,struct sockaddr *sa, int socklen, void *user_data){    struct event_base * base = (struct event_base *)user_data;    struct bufferevent * bev;    bev = bufferevent_socket_new(base,fd,BEV_OPT_CLOSE_ON_FREE);    if(!bev)    {        printf("error constructing bufferevent\n");        event_base_loopbreak(base);        return ;    }    char temp[1024] = {
   0};    // 将sockaddr强制转换为 sockaddr_in    sockaddr_in sin;    memcpy(&sin, sa, sizeof(sin));    // 取得ip和端口号    sprintf(temp, inet_ntoa(sin.sin_addr));    bevdata *bev_data = new bevdata;    bev_data->ip = temp;    bev_data->port = sin.sin_port;    printf("address = %s,port = %d,%x\n",temp,sin.sin_port,bev);    bufferevent_setcb(bev,conn_readcb,conn_writecb,conn_eventcb,bev_data);    bufferevent_enable(bev, EV_WRITE);    bufferevent_enable(bev, EV_READ);    bufferevent_write(bev,pMessage,strlen(pMessage));}int _tmain(int argc, _TCHAR* argv[]){    /*CCompleteIOWrapper complete ;    complete.initComplete("127.0.0.1",9500);    complete.startComplete();    getchar();    */    struct event_base * base;    struct evconnlistener * listener;    struct event * signal_event;    struct sockaddr_in sin;#ifdef WIN32    WSADATA wsa_data;    WSAStartup(0x0201,&wsa_data);#endif    base = event_base_new();    if(!base)    {        printf("cannot initailize libevent\n");        return 1;    }    memset(&sin,0,sizeof(sin));    sin.sin_family = AF_INET;    sin.sin_port = htons(PORT);    sin.sin_addr.S_un.S_addr = inet_addr(IP.c_str());    listener = evconnlistener_new_bind(base,listener_cb,(void*)base,        LEV_OPT_REUSEABLE | LEV_OPT_CLOSE_ON_FREE,-1,        (struct sockaddr*)&sin,        sizeof(sin));    if(!listener)    {        printf("can not create a listener\n");        return 0;    }    signal_event = evsignal_new(base,SIGINT,signal_cb,(void*)base);    if(!signal_event)    {        printf("can not create a signal event\n");        return 0;    }    printf("sertver starting...\n");    event_base_dispatch(base);    evconnlistener_free(listener);    event_free(signal_event);    event_base_free(base);    printf("done\n");        return 0;}
        
       
      
     

　　5,编译好的库文件，奉献给大家 https://files.cnblogs.com/files/techdreaming/lib.zip