I'm opening and binding a UDP socket (port 0) to my local ip address. I am
then sending some stuff to a destination address. This all appears to be
working ok. The problem arises when I try to receive. If I specify a from
address and from length in the netlibreceive call i get a netErrInternal, but
if I put null for the from address and from length everything works ok (at
least I think it does, because so far i'm only getting netErrWouldBlock (but it
might be a problem on the other end of the socket).
Here is my code. Can anyone see why I would be having a problem here?
Err NetListenUDP(NetInfoType *netinfo, PeerInfoType *peerinfo)
{
Err err=errNone;
char *pBufferBegin=NULL;
char *pBufferEnd=NULL;
UInt16 totalBytesToRead;
NetSocketAddrINType socketaddr;
// NetSocketAddrType *socketaddrP = (NetSocketAddrType*) &socketaddr;
UInt16 socketsize=0;
// We add a byte for null termination.
totalBytesToRead = netinfo->maxbytestoread + 1;
// Max size of a handle is 64K - header size
if (totalBytesToRead > ((64L * 1024) - 16))
{err=135;}
netinfo->receivestr = MemGluePtrNew(totalBytesToRead);
MemSet(netinfo->receivestr, totalBytesToRead,'\0');
pBufferBegin = netinfo->receivestr;
pBufferEnd = pBufferBegin;
MemSet(&socketaddr, sizeof(socketaddr), 0);
socketsize = sizeof(socketaddr);
netinfo->bytesread = 0;
netinfo->bytesread = NetLibReceive(netinfo->netlibrefnum,
netinfo->socketrefnum, (void *)pBufferEnd, totalBytesToRead, 0,
---> This does NOT work: socketaddrP, &socketsize, -1, &err);
---> This DOES work: NULL, NULL, netinfo->timeout, &err);
<there is more non-important stuff here>
}
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