OnReceive is not getting called??

From:

synx <synx.28eptr@mail.codecomments.com>

Newsgroups:

microsoft.public.vc.mfc

Date:

Fri, 26 May 2006 01:57:59 -0500

Message-ID:

<synx.28eptr@mail.codecomments.com>

Im trying somewhat simplest idea of sockets app using multicast.

Following is what *SockApp1* does:
1) _OnButtonCreate()_ creates the port, default OS assigned port.
Create(0, SOCK_DGRAM)

--------------------
m_pUDPSocket->Create(0, SOCK_DGRAM);
--------------------

2) When _OnButtonInitMulti()_ the mutlicast group(ip/port) is initialized.

Code:
--------------------

// set up destination address
memset(&m_addrMulti,0,sizeof(m_addrMulti));
m_addrMulti.sin_family =AF_INET;
m_addrMulti.sin_addr.s_addr =inet_addr(MULTIADDR);
m_addrMulti.sin_port =htons(MULTIPORT);
--------------------

3) When _OnButtonSend()_ it sends the data to the group.

Code:
--------------------
SendTo(m_sendBuffer, m_sendBuffer.GetLength(),
(const SOCKADDR* )&m_addrMulti, sizeof(m_addrMulti));
--------------------

*SockApp2* with following buttons clicked:
1) _OnButtonCreate()_ creates the port, default OS assigned port. Create(0,
SOCK_DGRAM)

Code:
--------------------
m_pUDPSocket->Create(0, SOCK_DGRAM);
--------------------

2) _OnButtonJoinMulti()_ joins the multicast group.

Code:
--------------------
ip_mreq mreq;
memset(&mreq, 0, sizeof(ip_mreq));
mreq.imr_multiaddr.s_addr = inet_addr(MULTIADDR);
mreq.imr_interface.s_addr = htonl(MULTIPORT);

if(SOCKET_ERROR == SetSockOpt(IP_ADD_MEMBERSHIP, &mreq, sizeof(mreq)))
{
AfxMessageBox("Error: Unable to add membership");
return -1;
}
--------------------

here

Code:
--------------------
#define MULTIADDR "224.0.1.129"
#define MULTIPORT319 5009
--------------------

Now, *SockApp1*, when i click onto the Send button, OnButtonSend() shud get
called in which im doing the SendTo() thing. Uptill here the App1/App2 both
are working fine, and the data is being sent successfully, this im sure.

The problem is, that *SockApp2*, which joined the group, is unable to
receive the data being sent from SockApp1.

Now, SockApp1 and SockApp2 are actually a _single_ app, called *SockApp*. I
added SockApp1/2 names just for the clarity of the question and
understanding.

At this moment, im just wondering... why SockApp2 is not receiving the data
from SockApp1???

Any ideas why?

--
synx
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