69 lines
4.4 KiB
HTML
69 lines
4.4 KiB
HTML
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<?xml version="1.0" encoding="utf-8"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
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"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml" lang="en-US" xml:lang="en-us">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="dc.language" scheme="rfc1766" content="en-us" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<meta name="dc.date" scheme="iso8601" content="2005-09-06" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="security" content="public" />
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<meta name="Robots" content="index,follow"/>
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<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
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<title>Externally described printer-file record-format considerations</title>
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<link rel="stylesheet" type="text/css" href="ibmidwb.css" />
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<link rel="stylesheet" type="text/css" href="ic.css" />
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</head>
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<body>
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<a id="Top_Of_Page" name="Top_Of_Page"></a><!-- Java sync-link -->
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<script language = "Javascript" src = "../rzahg/synch.js" type="text/javascript"></script>
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<a name="rzaluechgf"></a>
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<h4 id="rzaluechgf">Externally described printer-file record-format considerations</h4>
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<p>When a program using externally described printer files is compiled, the
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compiler extracts the file descriptions for the files referred to in the program
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and makes these file descriptions part of the compiled program. When you
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run the program, you can verify that the record formats with which the program
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was compiled are the current record formats. To do this, you use the LVLCHK
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parameter on the create file command when the file is created.</p>
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<p>The system assigns a unique level identifier for each record format when
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the file it is associated with is created. The system uses the information
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in the record format description to determine the level identifier. This
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information includes the name of the record format, the names, attributes,
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and order of the fields in the format, the indicators used, and the names
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and the order of the indicators in the record format. If you use the INDARA
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keyword to remove the indicator from the output buffer, the indicators used
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are not included in the level identifier information.</p>
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<p>When the file is opened, if level checking is specified (LVLCHK parameter),
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the system does a format-by-format comparison of the level-checking values
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specified in the program to the level-checking values specified in the printer
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file. If any of the formats specified in the program do not exist in the
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file, or if any of the level checking values are different, an error occurs.
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Formats can be added to or removed from a printer file without affecting
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existing application programs that do not use the added or deleted formats.</p>
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<p>You should display the file description to determine if the changes affect
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your program. You can use the Display File Field Description (DSPFFD) command
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to display the file description or, if you have the source entry utility (SEU),
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you can display the source file. Not every change in a file necessarily affects
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your program. You might not have to recompile your program. If you do not
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have to recompile your program, you should specify LVLCHK(*NO) for the file
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(CHGPRTF or OVRPRTF command).</p>
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<p>You can add a field to the end of a printer file record format without
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having to recompile your program as long as you do not want to use the field
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in your program. If you delete a field from the end of the record format,
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you do not have to recompile your program if you are not using the field.
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However, if you add a field to or delete a field from a record format anywhere
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other than at the end, you must recompile your program. Otherwise, the field
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offsets in the record passed to and from the program are wrong for processing.</p>
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<p>In general, anything that changes the length or position of any fields
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in the record format used by the program will require that the program be
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recompiled.</p>
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<a id="Bot_Of_Page" name="Bot_Of_Page"></a>
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</body>
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</html>
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