C / C++ / MFC

CCESocket::Create(SOCK_DGRAM)
   //some error checking}
   s = socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP)
   //some more error checking}
   //set some class member flags}

[my overridden function]
CMultiSock::Accept(localPort,localAddress)
   //call the base class function}
   CCESocket::Accept(localport)
        //error checking
        m_localAddress.sin_family = AF_INET;
	m_localAddress.sin_port = htons(localPort);
	m_localAddress.sin_addr.s_addr = htonl(INADDR_ANY);

	bind(s, (SOCKADDR*) &m_localAddress, sizeof(SOCKADDR_IN))
        //start a thread for a blocking receive containing:
              recvfrom(s,buf, bufSize, 0, (SOCKADDR*)&m_localAddress, &m_receiveAddrSz);
    return //from base accept

[my extra code to add multicast functionality in overridden Accept func]

<code>m_mReq.imr_multiaddr.s_addr = inet_addr("234.5.6.7");//224.0.23.167");
m_mReq.imr_interface.s_addr = INADDR_ANY;
m_localAddress.sin_addr.S_un.S_addr = inet_addr("234.5.6.7");
m_localAddress.sin_port = localport;
setsockopt(s,IPPROTO_IP,IP_ADD_MEMBERSHIP,(char*)&m_mReq,sizeof(ip_mreq));
CreateEvent(NULL,FALSE,FALSE,L"Multicast-Event");

setsockopt(s, IPPROTO_IP, IP_MULTICAST_IF, (char *)&addr,sizeof(addr)); 
int TTL = 32 ;
nRet = setsockopt(s, IPPROTO_IP, IP_MULTICAST_TTL,(char*)&TTL, sizeof(TTL));
int loop = 1;
setsockopt(s, IPPROTO_IP, IP_MULTICAST_LOOP,(char*)&loop, sizeof(loop));</code>

case SOCK_DGRAM:
if(m_udpReadyToSend)
{
while(len > 0)
{
if(m_socketState == ACCEPTING)
sentBytes = sendto(s, &buf[dataPtr], len, 0, (SOCKADDR*) &m_localAddress, sizeof(m_localAddress));
else 
sentBytes = sendto(s, &buf[dataPtr], len, 0, (SOCKADDR*) &m_remoteAddress, sizeof(m_remoteAddress));
.
.
.snip