UDP boost::asio的实现

最新推荐文章于 2024-08-07 18:07:39 发布

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最新推荐文章于 2024-08-07 18:07:39 发布

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分类专栏：网络通信

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本文介绍了一种在局域网内使用SOCKET编程进行广播消息的方法，包括发送端和接收端的代码实现，适用于Windows平台。通过设置广播选项并绑定特定端口，发送端可以向局域网内的所有主机广播消息，而接收端能够监听并接收这些广播消息。

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//////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;
}