本文主要介绍如何在vxworks中实现BroadCast，具有一定的参考价值。有兴趣的朋友可以参考一下。希望大家看完这篇文章后收获多多。让边肖带你去了解一下。
有了单播和组播，广播就不能运行了。broadcast、BroadCast和单播的区别在于地址。广播的地址是255 . 255 . 255 . 255 . 255；而且广播数据不会被路由器转发，局限于局域网，否则因为网络风暴，广播码其实更简单。直接写一个请参考单播/组播的例子。
服务器在单播的基础上略有变化。
调用Socket()打开一个套接字。
调用bind()来指定端口信息。
调用setsockopt()加入广播
调用recvfrom()以阻止接收
最后，调用close()关闭套接字。
广播客户端更简单。
调用Socket()打开一个套接字。
指定广播地址和端口信息
通过调用sendto()发送数据
最后，调用close()关闭套接字。
完整的代码如下
# include stdio . h/* pritnf()*/# include stdlib . h/* malloc()*/# include socklib . h/* socket()*/# include inetlib . h/* struct sockaddr _ in */# define HOST _ PORT 60000 # define MIN _ SIZE 10 # define MIN _ TIMES 10 void broadServer(int PORT，int size，int TIMES){ struct sockaddr _ in local addr；struct sockaddr _ in peerAddrint addrSize=sizeof(struct sockaddr)；int opt=1；int fdint numchar *缓冲区；if(PORT=2000)PORT=HOST _ PORT；if(SIZE=0)SIZE=MIN _ SIZE；if(TIMES=0)TIMES=MIN _ TIMES；printf(‘，大小，端口)；/* Open socket */FD=socket(AF _ inet，sock _ DGRAM，0)；/*指定本地地址信息*/localAddr.sin_family=
AF_INET; localAddr.sin_port = htons (port); localAddr.sin_addr.s_addr = INADDR_ANY; bind (fd, (struct sockaddr *)&localAddr, sizeof(struct sockaddr)); /* 加入广播 */ setsockopt(fd, SOL_SOCKET, SO_BROADCAST, (char *)&opt, sizeof(int)); buffer = (char *)malloc (size); while ((times--)>0) { /* 接收广播数据 */ num = recvfrom (fd, buffer, size, 0, (struct sockaddr *)&peerAddr, &addrSize); if (num < 0) break; printf (" broadServer: recv %d chars from %s\n", num, inet_ntoa(peerAddr.sin_addr)); } /* 关闭Socket */ close (fd); free (buffer); printf (" broadServer: end\n"); }
#include <stdio.h> /* pritnf() */#include <stdLib.h> /* malloc() */#include <sockLib.h> /* socket() */#include <inetLib.h> /* struct sockaddr_in */#define HOST_PORT 60000#define MIN_SIZE 1#define MIN_TIMES 1void broadClient (int port, int size, int times){ struct sockaddr_in serverAddr; int opt = 1; int fd; char *buffer; int num; if(port <= 2000) port = HOST_PORT; if(size <= 0) size = MIN_SIZE; if(times<= 0) times= MIN_TIMES; buffer = (char *)malloc(size); for(num=0; num<size; num++) buffer[num] = (num%26)+'a'; /* 服务器地址信息 */ serverAddr.sin_family = AF_INET; serverAddr.sin_port = htons (port); serverAddr.sin_addr.s_addr = htonl(INADDR_BROADCAST); printf (" broadClient: try to send %d chars %d times to %s:%d\n", size, times, inet_ntoa(serverAddr.sin_addr), port); /* 打开Socket */ fd = socket (AF_INET, SOCK_DGRAM, 0); while ((times--)>0) { /* 发送数据到BroadCast Server */ num = sendto(fd, buffer, size, 0, (struct sockaddr *)&serverAddr, sizeof(struct sockaddr)); printf (" broadClient: send %d chars\n", num); } /* 关闭Socket */ close (fd); free (buffer); printf (" broadClient: send finished\n"); }
运行情况如下如下
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