>Brian, if there is no data avalible, NetLibReceive call will block until at
>least one byte arrives.
I figured out that much - so I do a select first to see if there is data,
and then try to peek.
>If you use Codeworrier, there is a sample program at Symbol SDK
>Support\Samples\S24 Sampels\NdkLib\SrcNdkLib.c
>A fucntion "ReadN" that read "n" byte from a descriptor. I am no sure that
>will help you.
Thanks, I'll check that out.
>By the way, I am testing "telnet" from NetSample onemultor and I can't type
>data as soon as I login, any idea what went wrong?
Nope - although that much works in my own app ;-)
I just end up reading 1 byte at a time!
I'll attach my routine to this message, perhaps you'll notice something.
brian
--
// Return the number of bytes available for reading
Err CNetConnection::ReceiveCheck(UInt32 *numBytesP)
{
Err err;
Int16 numFDs;
Int16 nfds;
NetFDSetType arfds;
NetFDSetType awfds;
// Create our file descriptor set for checking input from the socket
nfds = 0;
netFDZero(&arfds);
netFDZero(&awfds);
netFDSet(fSocket, &arfds);
nfds = fSocket + 1;
// Assume no data
*numBytesP = 0;
// Check for activity
// Wait for any one of the descriptors to be ready.
numFDs = NetLibSelect(
fNetLibRefNum,
nfds, // width: # of descriptor bits to check
&arfds, // read FDs
&awfds, // write FDs
0, // NetFDSetType* exceptFDs,
0, // timeout -1 = forever
&err);
// Just a signal?
if (err == netErrTimeout) { err = 0; goto out; }
// If there is an error, bail
if (err) goto out;
// Return number of bytes found
if (numFDs > 0 && (netFDIsSet(fSocket, &arfds))) {
#if 1
// NOTE: This current code will just return 1, since we
only check for data present,
// and NOT the number of bytes, as one would expect. How
will we do that?!?
*numBytesP = 1;
#else
Err err;
Int16 numRead;
UInt16 fromLen = 0;
char buf[64];
numRead = NetLibReceive(
fNetLibRefNum,
fSocket,
buf, // bufP,
sizeof(buf), // bufLen, - Must be non-zero, or 0
returned by OS
netIOFlagPeek, // AHHH! Peek so we can find # in buffer
// flags
0, // Address to send to
(NetSocketAddrType*), or 0,
&fromLen, // len of above address
0, // fAppNetTimeout, // timeout -1 = forever
&err);
if (numRead >= 0) *numBytesP = numRead;
else *numBytesP = 0;
#endif
}
// No error (could check for numFDs < 0, but then need to take into
account timeout)
out:
return err;
}
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