Re: WSASocket FAILS for multicast options..
From: Paul G. Tobey [eMVP] (ptobey_no_spam_at_instrument_no_spam.com)
Date: 05/21/04
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Date: Fri, 21 May 2004 08:19:06 -0700
Yes, CE supports multicasting using Berkeley calls. Here's some code that I
pulled from an IP multicast test I've used on our devices:
// Initialize Winsock.
if (WSAStartup (MAKEWORD(1,1), &WSAData) != 0)
{
wsprintf (szError, TEXT("WSAStartup failed! Error: %d"),
WSAGetLastError ());
MessageBox (NULL, szError, TEXT("Error"), MB_OK);
return FALSE;
}
// Set up the socket. We aren't associated with a multicast
// group, after this, but the socket will be ready to be
// associated.
if ((Sock = socket (AF_INET, SOCK_DGRAM, 0)) == INVALID_SOCKET)
{
wsprintf (szError, TEXT("Allocating socket failed! Error: %d"),
WSAGetLastError ());
MessageBox (NULL, szError, TEXT("Error"), MB_OK);
return FALSE;
}
// Fill out the local socket's address information.
local_sin.sin_family = AF_INET;
local_sin.sin_port = htons (DEST_PORT);
local_sin.sin_addr.s_addr = htonl (INADDR_ANY);
// Associate the local address with Sock.
if (bind (Sock,
(struct sockaddr FAR *) &local_sin,
sizeof (local_sin)) == SOCKET_ERROR)
{
wsprintf (szError, TEXT("Binding socket failed! Error: %d"),
WSAGetLastError ());
MessageBox (NULL, szError, TEXT("Error"), MB_OK);
closesocket (Sock);
return FALSE;
}
// ... The socket is now ready to be associated.
And here's the code that joins a group:
mreq.imr_multiaddr.s_addr = inet_addr( joinIPs );
mreq.imr_interface.s_addr = INADDR_ANY;
if (setsockopt (Sock,
IPPROTO_IP,
IP_ADD_MEMBERSHIP,
(char FAR *)&mreq,
sizeof (mreq)) == SOCKET_ERROR)
{
wsprintf (szError, TEXT("setsockopt (join) failed! Error: %d"),
WSAGetLastError ());
MessageBox (NULL, szError, TEXT("Error"), MB_OK);
}
That's about all there is to it...
There are a number of messages in the archives about "multicast". You can
search via Google from this link:
http://groups.google.com/groups?hl=en&group=microsoft.public.windowsce
Paul T.
"JNH" <anonymous@discussions.microsoft.com> wrote in message
news:1001601c43ed3$c91e8a60$a501280a@phx.gbl...
> Paul,
>
> Thanks for the reply. Not quite what I expected though.
>
> The following isn't aimed at you Paul, just another rant
> at MS!
>
> If these methods do not 'generally' work, why on earth
> are they included in the SDK with full Help
> documentation! Nowhere in the Help files is there any
> mension of 'not working' in CE! Seems like I've just
> wasted a lot of time chasing throught this! Thanks
> Microsoft!
>
> One question,does CE support mulicasting using Berkley
> style calls?
>
> JNH
>
> >-----Original Message-----
> >I don't know specifically about WSASocket, but,
> generally, the WSA socket
> >calls don't work on Windows CE. You need to use the
> Berkeley sockets calls
> >themselves, instead (socket(), bind(), ioctlsocket(),
> etc.)
> >
> >Paul T.
> >
> >"JNH" <anonymous@discussions.microsoft.com> wrote in
> message
> >news:f84701c43e37$e0bc0b80$a601280a@phx.gbl...
> >> Hi,
> >>
> >> I've written a small multicast app which works fine on
> my
> >> desktop PC. However, when I ported it to WinCE, eVC
> 4.0,
> >> I ran into trouble. According to the WinCE doc's there
> >> does not seem to be any difference between Winsock 2.0
> >> for PC and WinCE.
> >>
> >> Here's the code that fails :-
> >>
> >> DWORD dwFlags = WSA_FLAG_MULTIPOINT_C_LEAF |
> >> WSA_FLAG_MULTIPOINT_D_LEAF;
> >>
> >> m_pProvider = WSASocket(AF_INET, SOCK_DGRAM,
> IPPROTO_UDP,
> >> NULL, 0, dwFlags);
> >>
> >> WSAStartup succeeds but the subsequent call to
> WSASocket
> >> fails with an error of WSAEINVAL.
> >>
> >> Using a value of 0 for dwFlags executes OK but I cannot
> >> use the socket for multicast.....
> >>
> >> The very same code is fine under Visual Studio.NET on
> my
> >> PC but not on my CE device.... Why????????? :-(
> >>
> >> Anyone got any ideas?
> >>
> >> Thanks
> >>
> >> JNH
> >>
> >>
> >
> >
> >.
> >
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