这篇文章主要介绍了vxworks中如何实现BroadCast，具有一定借鉴价值，感兴趣的朋友可以参考下，希望大家阅读完这篇文章之后大有收获，下面让小编带着大家一起了解一下。
广播的代码其实更简单，直接参考单播/组播的例子写一个
Server是在单播的基础上略加改动
调用socket()打开一个Socket
调用bind()指定Port信息
调用setsockopt()加入广播
调用recvfrom()阻塞接收
最后，调用close()关闭Socket
广播Client更简单了
调用socket()打开一个Socket
指定广播地址和Port信息
调用sendto()发送数据
最后，调用close()关闭Socket
完整代码如下
#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 10void broadServer (int port, int size, int times){struct sockaddr_in localAddr;struct sockaddr_in peerAddr;int addrSize = sizeof(struct sockaddr);int opt = 1;int fd;int num;char *buffer;if(port <= 2000) port = HOST_PORT;if(size <= 0) size = MIN_SIZE;if(times <= 0) times = MIN_TIMES;printf (">, size, port);/* 打开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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