用udp实现广播通信

特点：

用途：

广播地址：

实例：

server.cpp

#include <iostream>
#include <strings.h>
#include <string.h>
#include <sys/types.h>     
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <stdlib.h>
using namespace std;

int main()
{
	int sockfd;
	struct sockaddr_in saddr;
	int r;
	char recvline[1025];
	struct sockaddr_in presaddr;
	socklen_t len;
	
	sockfd = socket(AF_INET, SOCK_DGRAM, 0);
	bzero(&saddr, sizeof(saddr));
	saddr.sin_family = AF_INET;
	saddr.sin_addr.s_addr = htonl(INADDR_ANY);
	saddr.sin_port = htons(9999);
	bind(sockfd, (struct sockaddr*)&saddr, sizeof(saddr));
	while (1)
	{
		r = recvfrom(sockfd, recvline, sizeof(recvline), 0 , (struct sockaddr*)&presaddr, &len);
		if (r <= 0)
		{
			perror("");
			exit(-1);
		}
		recvline[r] = 0;
		cout <<"recvfrom "<< inet_ntoa(presaddr.sin_addr) <<" " << recvline << endl;
	}
	return 0;
}

client.cpp

#include <iostream>
#include <strings.h>
#include <string.h>
#include <sys/types.h>     
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <stdlib.h>
using namespace std;

int main()
{
	int sockfd;
	struct sockaddr_in des_addr;
	int r;
	char sendline[1024] = {"Hello"};
	const int on = 1;
	
	sockfd = socket(AF_INET, SOCK_DGRAM, 0);
	setsockopt(sockfd, SOL_SOCKET, SO_BROADCAST, &on, sizeof(on)); //设置套接字选项
	bzero(&des_addr, sizeof(des_addr));
	des_addr.sin_family = AF_INET;
	des_addr.sin_addr.s_addr = inet_addr("192.168.199.255"); //广播地址
	des_addr.sin_port = htons(9999);
	r = sendto(sockfd, sendline, strlen(sendline), 0, (struct sockaddr*)&des_addr, sizeof(des_addr));
	if (r <= 0)
	{
		perror("");
		exit(-1);
	}
	cout << "finish" << endl;
	return 0;
}

问题：

用udp实现广播通信,布布扣,bubuko.com

用udp实现广播通信

原文：http://blog.csdn.net/aspnet_lyc/article/details/34444111