118 lines
6.5 KiB
HTML
118 lines
6.5 KiB
HTML
|
<?xml version="1.0" encoding="UTF-8"?>
|
|||
|
|
<!DOCTYPE html
|
|||
|
|
PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
|
|||
|
|
<html lang="en-us" xml:lang="en-us">
|
|||
|
|
<head>
|
|||
|
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
|
|||
|
|
<meta name="security" content="public" />
|
|||
|
|
<meta name="Robots" content="index,follow" />
|
|||
|
|
<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))' />
|
|||
|
|
<meta name="DC.Type" content="task" />
|
|||
|
|
<meta name="DC.Title" content="Write a validity checking program" />
|
|||
|
|
<meta name="abstract" content="You can write a validity checking program for your command to detect errors and send diagnostic messages." />
|
|||
|
|
<meta name="description" content="You can write a validity checking program for your command to detect errors and send diagnostic messages." />
|
|||
|
|
<meta name="DC.subject" content="command, CL, defining, validity checking, writing, program, writing validity checking" />
|
|||
|
|
<meta name="keywords" content="command, CL, defining, validity checking, writing, program, writing validity checking" />
|
|||
|
|
<meta name="DC.Relation" scheme="URI" content="defcm.htm" />
|
|||
|
|
<meta name="DC.Relation" scheme="URI" content="valid.htm" />
|
|||
|
|
<meta name="DC.Relation" scheme="URI" content="../cl/sndpgmmsg.htm" />
|
|||
|
|
<meta name="DC.Relation" scheme="URI" content="../cl/crtcmd.htm" />
|
|||
|
|
<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
|
|||
|
|
<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 1998, 2006" />
|
|||
|
|
<meta name="DC.Format" content="XHTML" />
|
|||
|
|
<meta name="DC.Identifier" content="wvchk" />
|
|||
|
|
<meta name="DC.Language" content="en-us" />
|
|||
|
|
<!-- All rights reserved. Licensed Materials Property of IBM -->
|
|||
|
|
<!-- US Government Users Restricted Rights -->
|
|||
|
|
<!-- Use, duplication or disclosure restricted by -->
|
|||
|
|
<!-- GSA ADP Schedule Contract with IBM Corp. -->
|
|||
|
|
<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
|
|||
|
|
<link rel="stylesheet" type="text/css" href="./ic.css" />
|
|||
|
|
<title>Write a validity checking program</title>
|
|||
|
|
</head>
|
|||
|
|
<body id="wvchk"><a name="wvchk"><!-- --></a>
|
|||
|
|
<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
|
|||
|
|
<h1 class="topictitle1">Write a validity checking program</h1>
|
|||
|
|
<div><p>You can write a validity checking program for your command to detect
|
|||
|
|
errors and send diagnostic messages.</p>
|
|||
|
|
<div class="section"> <p>To write a validity checking program for your command, specify
|
|||
|
|
the name of the validity checking program on the VLDCKR parameter on the <span class="cmdname">Create
|
|||
|
|
Command (CRTCMD)</span> command. The program does not have to exist when
|
|||
|
|
the <span class="cmdname">Create Command (CRTCMD)</span> command is run. If *LIBL is
|
|||
|
|
used as the library qualifier, the library list is used to find the validity
|
|||
|
|
checking program when the created command is run.</p>
|
|||
|
|
<p>The following are
|
|||
|
|
two considerations for validity checking programs: </p>
|
|||
|
|
<ul><li>The validity checking program is called only if the command syntax is
|
|||
|
|
correct. All parameters are passed to the program the same as they are passed
|
|||
|
|
to a command processing program.</li>
|
|||
|
|
<li>You should not use the validity checking program to change parameter values
|
|||
|
|
because the changed values are not always passed to the command processing
|
|||
|
|
program.</li>
|
|||
|
|
</ul>
|
|||
|
|
<p>The remainder of this section describes how to send messages from
|
|||
|
|
a validity checking program that is written in CL.</p>
|
|||
|
|
<p>If the validity checking
|
|||
|
|
program detects an error, it should send a diagnostic message to the previous
|
|||
|
|
call and then send escape message CPF0002. For example, if you need a message
|
|||
|
|
saying that an account number is no longer valid, you add a message description
|
|||
|
|
similar to the following to a message file: </p>
|
|||
|
|
<pre>ADDMSGD MSG('Account number &2 no longer valid') +
|
|||
|
|
MSGID(USR0012) +
|
|||
|
|
MSGF(QGPL/ACTMSG) +
|
|||
|
|
SEV(40) +
|
|||
|
|
FMT((*CHAR 4) (*CHAR 6))</pre>
|
|||
|
|
<p>Note that the substitution variable &1 is not in the message
|
|||
|
|
but is defined in the FMT parameter as 4 characters. &1 is reserved for
|
|||
|
|
use by the system and must always be 4 characters. If the substitution variable &1
|
|||
|
|
is the only substitution variable defined in the message, you must ensure
|
|||
|
|
that the fourth byte of the message data does not contain a blank when you
|
|||
|
|
send the message.</p>
|
|||
|
|
<p>This message can be sent to the system by specifying
|
|||
|
|
the following in the validity checking: </p>
|
|||
|
|
<pre>SNDPGMMSG MSGID(USR0012) MSGF(QGPL/ACTMSG) +
|
|||
|
|
MSGDTA('0000' ∨∨ &ACCOUNT) MSGTYPE(*DIAG)</pre>
|
|||
|
|
<p>After the validity checking has sent all the necessary diagnostic
|
|||
|
|
messages, it should then send message CPF0002. The <span class="cmdname">Send Program
|
|||
|
|
Message (SNDPGMMSG)</span> command to send message CPF0002 looks like this:
|
|||
|
|
</p>
|
|||
|
|
<pre>SNDPGMMSG MSGID(CPF0002) MSGF(QCPFMSG) +
|
|||
|
|
MSGTYPE(*ESCAPE)</pre>
|
|||
|
|
<p>When the system receives message CPF0002, it sends message
|
|||
|
|
CPF0001 to the calling program to indicate that errors have been found.</p>
|
|||
|
|
<p>Message
|
|||
|
|
CPD0006 has been defined for use by the user-defined validity checking programs.
|
|||
|
|
An immediate message can be sent in the message data. Note in the following
|
|||
|
|
example that the message must be preceded by four character zeros.</p>
|
|||
|
|
<p>The
|
|||
|
|
following shows an example of a validity checking program: </p>
|
|||
|
|
<pre>PGM PARM(&PARM01)
|
|||
|
|
DCL VAR(&PARM01) TYPE(*CHAR) LEN(10)
|
|||
|
|
IF COND(&PARM01 *EQ 'ERROR') THEN(DO)
|
|||
|
|
SNDPGMMSG MSGID(CPD0006) MSGF(QCPFMSG) +
|
|||
|
|
MSGDTA('0000 DIAGNOSTIC MESSAGE FROM USER-DEFINED +
|
|||
|
|
VALIDITY CHECKER INDICATING THAT PARM01 IS IN ERROR.') +
|
|||
|
|
MSGTYPE(*DIAG)
|
|||
|
|
SNDPGMMSG MSGID(CPF0002) MSGF(QCPFMSG) MSGTYPE(*ESCAPE)
|
|||
|
|
ENDDO
|
|||
|
|
ELSE
|
|||
|
|
.
|
|||
|
|
.
|
|||
|
|
.
|
|||
|
|
ENDPGM</pre>
|
|||
|
|
</div>
|
|||
|
|
</div>
|
|||
|
|
<div>
|
|||
|
|
<div class="familylinks">
|
|||
|
|
<div class="parentlink"><strong>Parent topic:</strong> <a href="defcm.htm" title="This describes how you can define and create your own commands.">Define commands</a></div>
|
|||
|
|
</div>
|
|||
|
|
<div class="relconcepts"><strong>Related concepts</strong><br />
|
|||
|
|
<div><a href="valid.htm" title="The system performs validity checking on commands. You may also write your own validity checking program although it is not required.">Validity checking</a></div>
|
|||
|
|
</div>
|
|||
|
|
<div class="relinfo"><strong>Related information</strong><br />
|
|||
|
|
<div><a href="../cl/sndpgmmsg.htm">Send Program Message (SNDPGMMSG) command</a></div>
|
|||
|
|
<div><a href="../cl/crtcmd.htm">Create Command (CRTCMD) command</a></div>
|
|||
|
|
</div>
|
|||
|
|
</div>
|
|||
|
|
</body>
|
|||
|
|
</html>
|