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本篇仅用于记录自己所学知识及应用,代码仍可优化,仅供参考,如果发现有错误的地方,尽管留言于我,谢谢。
具体代码如下:
/*
server部分:
*/
#include <stdio.h>
#include <time.h>
#include <stdlib.h>
#include <signal.h>
#include <unistd.h>
#include <string.h>
#include <arpa/inet.h>
int main()
{
int fd = socket(AF_INET, SOCK_DGRAM, 0); //创建UDP套接字
int on = 1;
setsockopt(fd, SOL_SOCKET, SO_BROADCAST, &on, sizeof(on)); //设置为广播
struct sockaddr_in addr; //准备好对端各方地址结构体
socklen_t len = sizeof(addr);
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = inet_addr("224.0.0.100"); //多播组ID
addr.sin_port = htons(20000);
char buf[100];
time_t t;
while(1)
{
bzero(buf, 100);
t = time(NULL); //获取当前系统时间
snprintf(buf, 100, "%s", ctime(&t));
sendto(fd, buf, strlen(buf), 0, (struct sockaddr *)&addr, len);
sleep(1);
}
return 0;
}
/*
client部分:
*/
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <unistd.h>
#include <string.h>
#include <arpa/inet.h>
#include <pthread.h>
int main()
{
int fd = socket(AF_INET, SOCK_DGRAM, 0); //创建UDP套接字
struct sockaddr_in addr;
bzero(&addr, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = htonl(INADDR_ANY); //自动获取本机IP
addr.sin_port = htons(20000); //PORT
bind(fd, (struct sockaddr *)&addr, sizeof(addr)); //绑定地址
struct ip_mreq a; //加入UDP多播组
bzero(&a, sizeof(a));
a.imr_interface = addr.sin_addr; //指定接收多播组数据的网络接口
a.imr_multiaddr.s_addr = inet_addr("224.0.0.100"); //指定要接收的多播组ID
setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &a, sizeof(a));
char *buf = malloc(100*1024);
while(1)
{
bzero(buf, 100*1024);
recvfrom(fd, buf, 100*1024, 0, NULL, NULL); //接收发送方发来的时间数据
printf("收到发来的时间:%s", buf);
}
return 0;
}