libevent简单应用_3（来自源码）

//利用bufferevent_socket_connect()建立网络连接

#include <event2/event.h>#include <event2/bufferevent.h>#include <sys/socket.h>#include <string.h>void eventcb(struct bufferevent *bev, short events, void *ptr){if (events & BEV_EVENT_CONNECTED) {/* We're connected to 127.0.0.1:8080.   Ordinarily we'd dosomething here, like start reading or writing. */} else if (events & BEV_EVENT_ERROR) {/* An error occured while connecting. */}}int main_loop(void){struct event_base *base;struct bufferevent *bev;struct sockaddr_in sin;base = event_base_new();memset(&sin, 0, sizeof(sin));sin.sin_family = AF_INET;sin.sin_addr.s_addr = htonl(0x7f000001); /* 127.0.0.1 */sin.sin_port = htons(8080); /* Port 8080 */bev = bufferevent_socket_new(base, -1, BEV_OPT_CLOSE_ON_FREE);bufferevent_setcb(bev, NULL, NULL, eventcb, NULL);if (bufferevent_socket_connect(bev,(struct sockaddr *)&sin, sizeof(sin)) < 0) {/* Error starting connection */bufferevent_free(bev);return -1;}event_base_dispatch(base);return 0;}