UDP广播的代码

来源：互联网发布：内网文件传输软件编辑：程序博客网时间：2024/05/16 19:11

在bind 广播地址会一直返回-1，忽略即可~

服务器代码：

#include <stdio.h>#include <windows.h>#pragma comment(lib,"ws2_32.lib")#define ServicPort 1447void showerr(char * err,bool exit1){printf(err);if(exit1) {getchar();exit(0);}}int main(){WSAData wdata;WSAStartup(MAKEWORD(2,2),&wdata);SOCKET service;SOCKADDR_IN saddr={0};service = socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP);int iaddrlen;if(service == INVALID_SOCKET){showerr("不能创建套接字!\n",true);return 0;}saddr.sin_port = htons(ServicPort);saddr.sin_family = AF_INET;saddr.sin_addr.S_un.S_addr = INADDR_BROADCAST;iaddrlen = sizeof(SOCKADDR_IN);//设置该套接字为广播类型bool bOpt = true;setsockopt(service,SOL_SOCKET,SO_BROADCAST,(char *)&bOpt,sizeof(bOpt));int err = bind(service,(SOCKADDR * )&saddr,iaddrlen);while(true){char * buffer = "Hello world!\n There is socket broadcast test !\n";int iret = sendto(service,buffer,strlen(buffer),0,(SOCKADDR * )&saddr,iaddrlen);if(iret ==  SOCKET_ERROR)printf("Send failed!\n");else printf("Success \n");Sleep(500);}return 0;}

这个是接收代码：

#include <stdio.h>#include <windows.h>#pragma comment(lib,"ws2_32.lib")#define ServicPort 1447void showerr(char * err,bool exit1){printf(err);if(exit1) {getchar();exit(0);}}int main(){WSAData wdata;WSAStartup(MAKEWORD(2,2),&wdata);SOCKET connect_sock;SOCKADDR_IN saddr={0};SOCKADDR_IN saddr_from={0};connect_sock = socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP);int iaddrlen;if(connect_sock == INVALID_SOCKET){showerr("不能创建套接字!\n",true);return 0;}saddr.sin_port = htons(ServicPort);saddr.sin_family = AF_INET;saddr.sin_addr.S_un.S_addr = 0;saddr_from.sin_port = htons(ServicPort);saddr_from.sin_family = AF_INET;saddr_from.sin_addr.S_un.S_addr = INADDR_BROADCAST;iaddrlen = sizeof(SOCKADDR_IN);//设置该套接字为广播类型bool bOpt = true;setsockopt(connect_sock,SOL_SOCKET,SO_BROADCAST,(char *)&bOpt,sizeof(bOpt));int err = bind(connect_sock,(SOCKADDR * )&saddr,iaddrlen);if(err != 0){printf("%d %d\n",err,WSAGetLastError());showerr("绑定套接字失败！\n",true);}int count = 0;while(true){char buffer[1024]={0};int nsize;nsize = recvfrom(connect_sock,buffer,1024,0,(SOCKADDR *)&saddr_from,&iaddrlen);if(nsize>0)printf("%d : %s \n\n",count++,buffer);Sleep(2000);}return 0;}

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