udp的广播_setsockopt广播_udp组播

在UDP正常通信中我的server和client都可以正常通信，可是在server广播消息时client接收不到广播消息而server可以接收到自己的广播消息！如何让client接收到UDP的广播消息？

在测试过程中发现client如果bind了相应的广播端口的话可以正常接收广播消息！

重要代码如下：

server:

//Bind端口

boolCUDPServer::BindPort(UNSHORTunBindPort)

{

//设置绑定方式

structsockaddr_inServerAddr;

ServerAddr.sin_family=AF_INET;

ServerAddr.sin_port=htons(unBindPort);///端口

ServerAddr.sin_addr.s_addr=htonl(INADDR_ANY);///本机

m_Socket=socket(AF_INET,SOCK_DGRAM,0);

BOOLbBroadcast=TRUE;

setsockopt(m_Socket,SOL_SOCKET,SO_BROADCAST,(constchar*)&bBroadcast,sizeof(BOOL));

if(SOCKET_ERROR==bind(m_Socket,(structsockaddr*)&ServerAddr,sizeof(ServerAddr)))

{

returnfalse;

}

returntrue;

}

//发送广播消息

boolCUDPServer::BroadCase(char*szSend,DWORDdwSendSize)

{

SOCKADDR_INBroadcastAddr=m_ClientAddr;

BroadcastAddr.sin_family =AF_INET;

BroadcastAddr.sin_addr.s_addr =htonl(INADDR_BROADCAST);

BroadcastAddr.sin_port =htons(8848);

intnSiz=sizeof(SOCKADDR_IN);

if(SOCKET_ERROR==sendto(m_Socket,szSend,dwSendSize,0,(structsockaddr*)&BroadcastAddr,sizeof(BroadcastAddr)))

{

returnfalse;

}

unsignedshort*pUnBuff=(unsignedshort*)szSend;

cout<<"CUDPClient::BroadCase:"<<inet_ntoa(BroadcastAddr.sin_addr)<<"-"<<"size:"<<pUnBuff[0]<<"-"<<"type:"<<pUnBuff[1]<<endl;

returntrue;

}

client:

//Bind端口

boolCUDPClient::BindPort(std::stringstrBindIP,UNSHORTunBindPort)

{

m_ServerAddr.sin_family=AF_INET;

m_ServerAddr.sin_port=htons(unBindPort);///server的端口

m_ServerAddr.sin_addr.s_addr=inet_addr(strBindIP.c_str());///server的地址

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