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Detecting End of Host Print Job With End-of-File Structured Field

IP.com Disclosure Number: IPCOM000100368D
Original Publication Date: 1990-Apr-01
Included in the Prior Art Database: 2005-Mar-15
Document File: 2 page(s) / 60K

Publishing Venue

IBM

Related People

Lopez, VE: AUTHOR [+2]

Abstract

This programming technique is used by the IBM 3270 Emulation Program to detect the end of a host print job on a non-SNA connection.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 72% of the total text.

Detecting End of Host Print Job With End-of-File Structured Field

       This programming technique is used by the IBM 3270
Emulation Program to detect the end of a host print job on a non-SNA
connection.

      The performance of host print on a non-SNA connection was
impacted significantly when the print jobs were redirected to a print
server on an IBM PC LAN.

      Because the print server spools the print data that it receives
to a disk file, it does not begin to print the job until the spool
file is closed by the redirector.  On a non-SNA device, it is not
possible for the host to indicate, via SNA indicators, when the end
of the data for a print job has been received.

      This resulted in several print jobs from the same printer
session being concatenated into one spool file, which significantly
delayed the printing of the first print job.  The spool file was not
closed until the logical communication connection was terminated.

      A new query reply and a new write structured field were
designed and implemented in the 3270 Emulation Program in order to
solve this problem.

      The new query reply, which is called the Begin/End of File
Query Reply, is sent inbound in response to a Read Partition Query
List (Begin/End of File, Equivalent, or All) to indicate support of
the Begin/End of File Structured Field.

      The format of the Begin/End of File Query Reply is as follows:

      The new structured field, which is called t...