Re: Sockets server HELP! - repost

[Scott Klement <klemscot@xxxxxxxxxxxx>]

Hi Jim,

Thanks for the reply.   I'm glad you got it all figured out.

One thing I can suggest for the "fixed 8 bytes" issue is to simply add
the data as you receive it to a buffer... then once you have 8 bytes,
use that.

If you want the program to wait for the data, this could be accomplished
with a simple loop.   Here's a similar piece of code from one of my
programs:

     c                   eval      wkOutLen = 0

     c                   dou       wkOutLen >= %size(wkOutBuf)

     c                   eval      wwRecvLen = %size(wkOutBuf) - wkOutLen
     c                   eval      p_RecvBuf = %addr(wkOutBuf) + wkOutLen

     c                   eval      wwRC = recv(peSock:p_RecvBuf:wwRecvLen:0)
     c                   if        wwRC < 1
     c                   leave
     c                   endif

     c                   eval      wkOutLen = wkOutLen + wwRC
     c                   enddo

With that code, if wkOutBuf is 8 bytes long, it'll keep receiving data
until it fills it up...


On Wed, 15 May 2002, Jim W wrote:
>
> First of all, thanks again for your help.  (Once again the list comes
> through!)  I've been out of the office, and this is the first chance I've
> had to let you know what happened.
>
> <SNIP>
>
> I also note this:
>
>        *   ....Receive first 8 bytes of header length
>       C            Eval      RC = Recv(I: SocketData@
>       C                             : 8: 0)
> <SNIP>
>
> Also keep in mind that recv() will return whatever is in the receive
> buffer for the socket.   It isn't necessarily 8 bytes long.   It may be
> only part of the 8 bytes you need...  you should be either using some sort
> of delimiter (usually CR/LF) to determine when a whole message has been
> received, or else you should be using a loop to get a fixed length of 8
> bytes...   I hope you understand what I mean, as this is a bit too much
> to try to fully explain in this message...
>
>
> The reason I was looking at only 8 bytes is that every message being sent by
> the other end has an 8 byte message length header.  I needed to get the
> length and then do a second receive for that length.  If not I could get
> part of the following message in my receive and get everything out-of-wack.
> The messages we are receiving have no CR/LF type EOR delimiters.
>