RE: SETSOCKOPT question

Fun with HL7 I see. When you need to test for certain strings that you
receive over a socket connection, you should always have two buffers and
never check the one that gets the bytes from the socket. Read from the
socket and then append the number of bytes read to a holding buffer.
Check the holding buffer for the end message you are looking for. If
you don't find you string, loop back and read some more bytes and then
append them to the holding buffer and check again. You will have to
keep track of where you are in the holding buffer as you move data in
and out of it, but that is only real way to deal with streaming data.

-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx

[mailto:rpg400-l-bounces@xxxxxxxxxxxx]

On Behalf Of GKern@xxxxxxxxxxxxxxxx
Sent: Friday, November 02, 2007 2:48 PM
To: rpg400-l@xxxxxxxxxxxx
Subject: Re: SETSOCKOPT question

Hi Scott,

"I'm really curious as to why you'd want to mess with this setting."

I was curious if this was an alternative (to enable increasing the

size of

the data stream received in one read of the buffer) since I'm having a
problem with my socket server program where ~I think~ the end of data
stream I'm scanning for (x'1c0d' may be found in two subsequent reads

of

the buffer (where one read of the buffer has the x'1c' and the next

read

starts with the x'0d' which should be (logically) attached to the last
byte of the last buffer read).

I'm having a problem where when I receive data it appears that I'm
receiving beginning of data characters (x'0b') before I receive the

end of

data characters (x'1c0d'). This has only happened 12 times out of over
3300 files I've received by the socket server last month.

But then I concluded that if the end of data characters being split
between two reads of the buffer really is the problem, then a larger

data

stream wouldn't really solve my problem. (So I abandoned the idea of
trying to enlarge the maximum segment size.)

I've since changed my socket program to hopefully correct it by

scanning

for the x'1c' (in addition to scanning for the full x'1c0d') and

making an

assumption that when it (x'1c') is found that I can proceed as if it

is

the end of the data. It's being tested right now. And as far as I know

I

should never be receiving x'1c' except to signal 'message completion'
within the data stream received.

Thanks for responding.

Regards, Jerry

Gerald Kern - MIS Project Leader
Lotus Notes/Domino Administrator
IBM Certified RPG IV Developer
The Toledo Clinic, Inc.
4235 Secor Road
Toledo, OH 43623-4299
Phone 419-479-5535
gkern@xxxxxxxxxxxxxxxx


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