91 lines
5.9 KiB
HTML
91 lines
5.9 KiB
HTML
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<meta name="DC.Title" content="Example: Call application programs" />
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<meta name="abstract" content="This example shows how to define and create a command to call an application program." />
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<title>Example: Call application programs</title>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Example: Call application programs</h1>
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<div><p>This example shows how to define and create a command to call an
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application program.</p>
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<div class="section"> <p>You can create commands to call application programs. If you
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create a command to call an application program, i5/OS™ performs validity checking on the
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parameters passed to the program. However, if you use the <span class="cmdname">Call (CALL)</span> command
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to call an application program, the application program must perform the validity
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checking.</p>
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<p>For example, a label writing program (LBLWRT) writes any number
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of labels for a specific customer on either 1- or 2-part forms. When the
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LBLWRT program is run, it requires three parameters: the customer number,
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the number of labels, and the type of form to be used (ONE or TWO).</p>
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<p>If
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the program were called directly from the display, the second parameter would
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be in the wrong format for the program. A numeric constant on the CALL command
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is always 15 digits with 5 decimal positions, and the LBLWRT program expects
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a 3-digit number with no decimal positions. A command can be created that
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provides the data in the format required by the program.</p>
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<p>The command
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definition statements for a command to call the LBLWRT program are: </p>
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<pre>CMD PROMPT('Label Writing Program')
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PARM KWD(CUSNBR) TYPE(*CHAR) LEN(5) MIN(1) +
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PROMPT('Customer Number')
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PARM KWD(COUNT) TYPE(*DEC) LEN(3) DFT(20) RANGE(10 150) +
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PROMPT('Number of Labels')
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PARM KWD(FRMTYP) TYPE(*CHAR) LEN(3) DFT('TWO') RSTD(*YES) +
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SPCVAL(('ONE') ('TWO') ('1' 'ONE') ('2' 'TWO')) +
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PROMPT('Form Type')</pre>
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<p>For the second parameter, COUNT, a default value of 20 is specified
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and the RANGE parameter allows only values from 10 to 150 to be entered for
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the number of labels.</p>
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<p>For the third parameter, FRMTYP, the SPCVAL parameter
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allows the display station user to enter <samp class="codeph">'ONE', 'TWO', '1'</samp>,
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or <samp class="codeph">'2'</samp> for this parameter. The program expects the value <samp class="codeph">'ONE'</samp> or <samp class="codeph">'TWO'</samp>;
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however, if the display station user enters <samp class="codeph">'1'</samp> or <samp class="codeph">'2',</samp> the
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command makes the necessary substitution for the FRMTYP parameter.</p>
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<p>The
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command processing program for this command is the application program LBLWRT.
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If the application program were an RPG for i5/OS program, the following specifications
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would be made in the program to receive the following parameters:</p>
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<pre>*ENTRY PLIST
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PARM CUST 5
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PARM COUNT 30
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PARM FORM 3</pre>
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<p>The <span class="cmdname">Create Command (CRTCMD) </span>command is as
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follows: </p>
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<pre>CRTCMD CMD(LBLWRT) PGM(LBLWRT) SRCMBR(LBLWRT)</pre>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="exdcc.htm" title="This contains examples of defining and creating commands.">Examples: Define and create commands</a></div>
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</div>
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<div class="relinfo"><strong>Related information</strong><br />
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<div><a href="../cl/crtcmd.htm">Create Command (CRTCMD) command</a></div>
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</div>
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</div>
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</body>
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</html>
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