libevent小程序

来源：互联网发布：远程网络连接器编辑：程序博客网时间：2024/06/07 05:23
#include <iostream>#include <WinSock2.h>#include "event2/bufferevent.h"#include "event2/buffer.h"#include "event2/listener.h"#include "event2/util.h"#include "event2/event.h"#pragma comment(lib, "Ws2_32.lib")using namespace std;static voidecho_read_cb(struct bufferevent *bev, void *ctx){/* This callback is invoked when there is data to read on bev. */struct evbuffer *input = bufferevent_get_input(bev);struct evbuffer *output = bufferevent_get_output(bev);char recv_buf[1024];memset(recv_buf,0,sizeof(recv_buf));int nInputLength = evbuffer_get_length(input);int recv_size = bufferevent_read(bev,recv_buf,sizeof(recv_buf));if ( recv_size <=0 ){return ;}cout<<recv_buf<<endl;/* Copy all the data from the input buffer to the output buffer. */evbuffer_add_buffer(output, input);}static voidecho_event_cb(struct bufferevent *bev, short events, void *ctx){if (events & BEV_EVENT_ERROR)perror("Error from bufferevent");if (events & (BEV_EVENT_EOF | BEV_EVENT_ERROR)) {bufferevent_free(bev);}}static voidaccept_conn_cb(struct evconnlistener *listener,   evutil_socket_t fd, struct sockaddr *address, int socklen,   void *ctx){/* We got a new connection! Set up a bufferevent for it. */struct event_base *base = evconnlistener_get_base(listener);struct bufferevent *bev = bufferevent_socket_new(base, fd, BEV_OPT_CLOSE_ON_FREE);bufferevent_setcb(bev, echo_read_cb, NULL, echo_event_cb, NULL);bufferevent_enable(bev, EV_READ|EV_WRITE);}static voidaccept_error_cb(struct evconnlistener *listener, void *ctx){struct event_base *base = evconnlistener_get_base(listener);int err = EVUTIL_SOCKET_ERROR();fprintf(stderr, "Got an error %d (%s) on the listener. ""Shutting down.\n", err, evutil_socket_error_to_string(err));event_base_loopexit(base, NULL);}const char*  CONNECT_IP = "127.0.0.1";const unsigned int   CONNECT_PORT = 21101;int main(){WSAData was_data;/* 为了在应用程序当中调用任何一个Winsock API函数，首先第一件事情就是必须通过WSAStartup函数完成对Winsock服务的初始化，因此需要调用WSAStartup函数。使用Socket的程序在使用Socket之前必须调用WSAStartup函数。该函数的第一个参数指明程序请求使用的Socket版本，其中高位字节指明副版本、低位字节指明主版本；操作系统利用第二个参数返回请求的Socket的版本信息。当一个应用程序调用WSAStartup函数时，操作系统根据请求的Socket版本来搜索相应的Socket库，然后绑定找到的Socket库到该应用程序中。以后应用程序就可以调用所请求的Socket库中的其它Socket函数了。*/int ret = WSAStartup(0x0201, &was_data);cout<<ret<<endl;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 = NULL;struct evconnlistener *pevlistener = NULL;base = event_base_new();if (base==NULL){cout<<"libevent new error"<<endl;return 0;}//函数内自动设置nonblockpevlistener = evconnlistener_new_bind(base,accept_conn_cb,NULL,LEV_OPT_CLOSE_ON_FREE|LEV_OPT_REUSEABLE,-1,                                  (struct sockaddr*)&sin,sizeof(struct sockaddr));if (!pevlistener){cout<<"listen error"<<endl;return 0;}evconnlistener_set_error_cb(pevlistener,accept_error_cb);event_base_dispatch(base);return 0;}
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