这两天很多人在问怎么样用SOCKET实现广播（BoardCast）

正好我做过这方面的程序，这里用最简单的代码写一个广播发送和接受的例子：

//

//发送端程序

#include
#include

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_.NET,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("%sn",sendBuff);
  }
return 0;
}

/

//接收

#include
#include
#include

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] = '';
  printf("%sn",cRecvBuff);

}
  return 0;
}

来自 “ ITPUB博客 ” ，链接：http://blog.itpub.net/10752043/viewspace-992490/，如需转载，请注明出处，否则将追究法律责任。