bufferevent实现的简易http client

来源：互联网发布：it's worth it 编辑：程序博客网时间：2024/06/05 00:37
#include "stdafx.h"#include <event2/dns.h>#include <event2/bufferevent.h>#include <event2/buffer.h>#include <event2/util.h>#include <event2/event.h>#include <stdio.h>void readcb(struct bufferevent *bev, void *ptr){char buf[1024];int n;struct evbuffer *input = bufferevent_get_input(bev);while ((n = evbuffer_remove(input, buf, sizeof(buf))) > 0) {fwrite(buf, 1, n, stdout);}}void eventcb(struct bufferevent *bev, short events, void *ptr){if (events & BEV_EVENT_CONNECTED) {printf("Connect okay.\n");} else if (events & (BEV_EVENT_ERROR|BEV_EVENT_EOF)) {struct event_base *base = (struct event_base *)ptr;if (events & BEV_EVENT_ERROR) {int err = bufferevent_socket_get_dns_error(bev);if (err)printf("DNS error: %s\n", evutil_gai_strerror(err));}printf("Closing\n");bufferevent_free(bev);event_base_loopexit(base, NULL);}}int main(int argc, char **argv){struct event_base *base;struct evdns_base *dns_base;struct bufferevent *bev;WORD wVersionRequested;WSADATA wsaData;int err;wVersionRequested = MAKEWORD( 2, 2 );err = WSAStartup( wVersionRequested, &wsaData );if ( err != 0 ) {return -1;}if (argc != 3) {printf("Trivial HTTP 0.x client\n""Syntax: %s [hostname] [resource]\n""Example: %s www.google.com /\n",argv[0],argv[0]);return 1;}base = event_base_new();dns_base = evdns_base_new(base, 1);bev = bufferevent_socket_new(base, -1, BEV_OPT_CLOSE_ON_FREE);bufferevent_setcb(bev, readcb, NULL, eventcb, base);bufferevent_enable(bev, EV_READ|EV_WRITE);evbuffer_add_printf(bufferevent_get_output(bev), "GET %s\r\n", argv[2]);bufferevent_socket_connect_hostname(bev, dns_base, AF_UNSPEC, argv[1], 80);event_base_dispatch(base);WSACleanup();return 0;}
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