UDP广播和接受

最新推荐文章于 2025-01-18 18:33:48 发布

转载最新推荐文章于 2025-01-18 18:33:48 发布 · 463 阅读

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本文介绍了如何使用SOCKET编程在局域网中实现广播消息的功能，包括发送端和接收端的程序实现。通过初始化WinSocket、绑定本地端口、设置广播标志等步骤，发送端可以将消息广播到局域网内的所有设备。接收端则通过监听特定端口接收广播消息。此方法适用于需要在局域网内进行实时通讯的应用场景。

//////主　　题：在局域网中, 使用 SOCKET编程,如何广播消息??? ///////////////////////////////////////////////////
//发送端程序
#include <stdio.h >
#include <winsock.h >
int main(int argc, char* argv[]) {
WSADATA wsaData; //指向WinSocket信息结构的指针
SOCKET sockListener;
SOCKADDR_IN sin,saUdpServ;
BOOL fBroadcast = TRUE;
char sendBuff[1024];
int nSize;
int ncount=0;
if(WSAStartup(MAKEWORD( 1, 1 ), &wsaData )!=0)//进行WinSocket的初始化
{
printf( "Can 't initiates windows socket!Program stop.\n ");//初始化失败返回-1
return -1;
}
sockListener=socket(PF_INET,SOCK_DGRAM,0);
setsockopt ( sockListener,SOL_SOCKET,SO_BROADCAST,
(CHAR *)&fBroadcast,sizeof ( BOOL ));

sin.sin_family = AF_INET;
sin.sin_port = htons(0);
sin.sin_addr.s_addr = htonl(INADDR_ANY);
if(bind( sockListener, (SOCKADDR *)&sin, sizeof(sin))!=0)
{
printf( "Can 't bind socket to local port!Program stop.\n ");//初始化失败返回-1
return -1;
}
saUdpServ.sin_family = AF_INET;
saUdpServ.sin_addr.s_addr = htonl ( INADDR_BROADCAST );
saUdpServ.sin_port = htons (7001);//发送用的端口，可以根据需要更改
nSize = sizeof ( SOCKADDR_IN );
while(1)
{
sprintf(sendBuff, "Message %d ",ncount++);
sendto ( sockListener,sendBuff,
lstrlen (sendBuff),
0,
(SOCKADDR *) &saUdpServ,
sizeof ( SOCKADDR_IN ));
printf( "%s\n ",sendBuff);
}
return 0;
}
///////////////////// //接收
#include <stdio.h >
#include <winsock.h >
#include <conio.h >
int main(int argc, char* argv[])
{
WSADATA wsaData; //指向WinSocket信息结构的指针
SOCKET sockListener;
SOCKADDR_IN sin,saClient;
char cRecvBuff[1024];
int nSize,nbSize;
int iAddrLen=sizeof(saClient);
if(WSAStartup(MAKEWORD( 1, 1 ), &wsaData )!=0)//进行WinSocket的初始化
{
printf( "Can 't initiates windows socket!Program stop.\n ");//初始化失败返回-1
return -1;
}
sockListener=socket(AF_INET, SOCK_DGRAM,0);
sin.sin_family = AF_INET;
sin.sin_port = htons(7001);//发送端使用的发送端口，可以根据需要更改
sin.sin_addr.s_addr = htonl(INADDR_ANY);
if(bind( sockListener, (SOCKADDR FAR *)&sin, sizeof(sin))!=0)
{
printf( "Can 't bind socket to local port!Program stop.\n ");//初始化失败返回-1
return -1;
}
while(1)
{
nSize = sizeof ( SOCKADDR_IN );
if((nbSize=recvfrom (sockListener,cRecvBuff,1024,0,
(SOCKADDR FAR *) &saClient,&nSize))==SOCKET_ERROR)
{
printf( "Recive Error ");
break;
}
cRecvBuff[nbSize] = '\0 ';
printf( "%s\n ",cRecvBuff);
}
return 0;
}