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libevent 简单客户端和服务器

第七根弦 2015 年 1 月 28 日 libevent, UC 发表评论 (0)

libevent 简单客户端和服务器

server.cpp

C++
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#include <stdio.h>  
#include <string.h>  
#include <iostream>  
#include <sys/socket.h>      
#include <netinet/in.h>      
#include <arpa/inet.h>      
#include <netdb.h>  
#include <unistd.h>  
 
#include <event.h>  
using namespace std;
 
// 事件base  
struct event_base* base;
 
// 读事件回调函数  
void onRead(int iCliFd, short iEvent, void *arg)
{
int iLen;
char buf[1500];
 
iLen = recv(iCliFd, buf, 1500, 0);
 
if (iLen <= 0)
{
cout << "Client Close" << endl;
 
// 连接结束(=0)或连接错误(<0)，将事件删除并释放内存空间
struct event *pEvRead = (struct event*) arg;
event_del(pEvRead);
delete pEvRead;
 
close(iCliFd);
return;
}
 
buf[iLen] = 0;
cout << "Client Info:" << buf << endl;
 
struct bufferevent* buf_ev;
buf_ev = bufferevent_new(iCliFd, NULL, NULL, NULL, NULL);
buf_ev->wm_read.high = 4096;
char MESSAGE[] = "welcome to server..";
bufferevent_write(buf_ev, MESSAGE, strlen(MESSAGE));
}
 
// 连接请求事件回调函数  
void onAccept(int iSvrFd, short iEvent, void *arg)
{
int iCliFd;
struct sockaddr_in sCliAddr;
 
socklen_t iSinSize = sizeof(sCliAddr);
iCliFd = accept(iSvrFd, (struct sockaddr*) &sCliAddr, &iSinSize);
 
// 连接注册为新事件 (EV_PERSIST为事件触发后不默认删除)
struct event *pEvRead = new event;
event_set(pEvRead, iCliFd, EV_READ | EV_PERSIST, onRead, pEvRead);
event_base_set(base, pEvRead);
event_add(pEvRead, NULL);
 
struct bufferevent* buf_ev;
buf_ev = bufferevent_new(iCliFd, NULL, NULL, NULL, NULL);
buf_ev->wm_read.high = 4096;
char MESSAGE[] = "welcome to server..";
bufferevent_write(buf_ev, MESSAGE, strlen(MESSAGE));
 
cout << "a client connect:" << iCliFd << endl;
}
 
int main()
{
 
int iSvrFd;
struct sockaddr_in sSvrAddr;
 
memset(&sSvrAddr, 0, sizeof(sSvrAddr));
sSvrAddr.sin_family = AF_INET;
sSvrAddr.sin_addr.s_addr = inet_addr("127.0.0.1");
sSvrAddr.sin_port = htons(8888);
 
// 创建tcpSocket（iSvrFd），监听本机8888端口
iSvrFd = socket(AF_INET, SOCK_STREAM, 0);
bind(iSvrFd, (struct sockaddr*) &sSvrAddr, sizeof(sSvrAddr));
listen(iSvrFd, 10);
 
// 初始化base
base = (struct event_base*) event_init();
 
struct event evListen;
// 设置事件
event_set(&evListen, iSvrFd, EV_READ | EV_PERSIST, onAccept, NULL);
// 设置为base事件
event_base_set(base, &evListen);
// 添加事件
event_add(&evListen, NULL);
 
// 事件循环
event_base_dispatch(base);
 
return 0;
}

client.cpp

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/******* 客户端程序  client.c ************/
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <netdb.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <sys/types.h>
#include <arpa/inet.h>
#include<sys/time.h>
#include<event.h>
int main(int argc, char *argv[])
{
int sockfd;
char buffer[1024];
struct sockaddr_in server_addr;
struct hostent *host;
int portnumber, nbytes;
 
if ((host = gethostbyname("127.0.0.1")) == NULL)
{
fprintf(stderr, "Gethostname error\n");
exit(1);
}
 
if ((portnumber = atoi("8888")) < 0)
{
fprintf(stderr, "Usage:%s hostname portnumber\a\n", argv[0]);
exit(1);
}
 
/* 客户程序开始建立 sockfd描述符  */
if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1)
{
fprintf(stderr, "Socket Error:%s\a\n", strerror(errno));
exit(1);
}
 
/* 客户程序填充服务端的资料       */
bzero(&server_addr, sizeof(server_addr));
server_addr.sin_family = AF_INET;
server_addr.sin_port = htons(portnumber);
server_addr.sin_addr = *((struct in_addr *) host->h_addr);
 
/* 客户程序发起连接请求         */
if (connect(sockfd, (struct sockaddr *) (&server_addr),
sizeof(struct sockaddr)) == -1)
{
fprintf(stderr, "Connect Error:%s\a\n", strerror(errno));
exit(1);
}
 
while (true)
{
char MESSAGE[] = "hello server..\n";
//bufferevent_write(buf_ev,MESSAGE,strlen(MESSAGE));
//
if (-1 == (::send(sockfd, MESSAGE, strlen(MESSAGE), 0)))
{
printf("the net has a error occured..");
break;
}
 
if ((nbytes = read(sockfd, buffer, 1024)) == -1)
{
fprintf(stderr, "read error:%s\n", strerror(errno));
exit(1);
}
 
buffer[nbytes] = '\0';
printf("I have received:%s\n", buffer);
memset(buffer, 0, 1024);
 
sleep(2);
 
}
/* 结束通讯     */
close(sockfd);
exit(0);
}

编译命令：
g++ -g server.cpp -o server -levent
g++ -g client.cpp -o client 

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