组播播出程序中主要的代码

 if ((hSendSocket = socket(AF_INET, SOCK_DGRAM, 0)) == INVALID_SOCKET)
    {
        sprintf(szPromoteMsg,"socket failed with: %d\n", WSAGetLastError());
        AfxMessageBox(szPromoteMsg);

        return ;
    }
    // Bind the socket to the local interface. This is done so 
    // that we can receive data.
    local.sin_family = AF_INET;
    local.sin_port   = htons(m_iPort);
    local.sin_addr.s_addr = m_dwInterface;

    if (bind(hSendSocket, (struct sockaddr *)&local, 
        sizeof(local)) == SOCKET_ERROR)
    {
        sprintf(szPromoteMsg,"bind failed with: %d\n", WSAGetLastError());
        AfxMessageBox(szPromoteMsg);

    return ;
    }
    // Setup the im_req structure to indicate what group we want
    // to join as well as the interface
    //
    remote.sin_family      = AF_INET;
    remote.sin_port        = htons(m_iPort);
    remote.sin_addr.s_addr = (m_dwTargetIPAddress);
    
    mcast.imr_multiaddr.s_addr = (m_dwTargetIPAddress);
    mcast.imr_interface.s_addr = m_dwInterface;//±¾µØÒÔÌ«Íø MAC µØÖ·

    if (setsockopt(hSendSocket, IPPROTO_IP, IP_ADD_MEMBERSHIP,
        (char *)&mcast, sizeof(mcast)) == SOCKET_ERROR)
    {
        sprintf(szPromoteMsg,"setsockopt(IP_ADD_MEMBERSHIP) failed: %d\n",     
                              WSAGetLastError());
        AfxMessageBox(szPromoteMsg);

        return ;
    }
    // Set the TTL to something else. The default TTL is 1.
    optval = 8;
    if (setsockopt(hSendSocket, IPPROTO_IP, IP_MULTICAST_TTL, 
        (char *)&optval, sizeof(int)) == SOCKET_ERROR)
    {
        sprintf(szPromoteMsg,"setsockopt(IP_MULTICAST_TTL) failed: %d\n", 
        WSAGetLastError());
        AfxMessageBox(szPromoteMsg);

        return ;
    }
    // Disable the loopback if selected. Note that on NT4 and Win95
    // you cannot disable it.
    if (bLoopBack)
    {
        optval = 0;
        if (setsockopt(hSendSocket, IPPROTO_IP, IP_MULTICAST_LOOP,
            (char *)&optval, sizeof(optval)) == SOCKET_ERROR)
        {
            sprintf(szPromoteMsg,"setsockopt(IP_MULTICAST_LOOP) failed: %d\n",  
            WSAGetLastError());
            AfxMessageBox(szPromoteMsg);

            return ;
        }
    }
    bAllowedSending=TRUE;
/*
    BROADCASTPARAM *pBroadcastParam=new BROADCASTPARAM ;
    pBroadcastParam->remote=remote;
pBroadcastParam->nRate=m_iRate;
pBroadcastParam->hBroadcastSocket=hSendSocket;
pBroadcastParam->bAllowedSending=bAllowedSending;

AfxBeginThread(BroadcastThreadProc,
                         (LPVOID)pBroadcastParam,
 THREAD_PRIORITY_NORMAL,
 0,
 0,
 NULL);
*/

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