80 lines
4.7 KiB
HTML
80 lines
4.7 KiB
HTML
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<meta name="DC.Title" content="VARLEN (Variable-Length User Data) keyword for ICF files" />
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<meta name="abstract" content="Use this record-level keyword to indicate that the length of the record sent across the line is variable. The length is specified at run time in the field parameter." />
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<meta name="description" content="Use this record-level keyword to indicate that the length of the record sent across the line is variable. The length is specified at run time in the field parameter." />
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<meta name="DC.subject" content="VARLEN (Variable-Length User Data) keyword, Variable-Length User Data (VARLEN) keyword" />
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<title>ICF Files, VARLEN</title>
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</head>
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<body id="icfvarl"><a name="icfvarl"><!-- --></a>
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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">VARLEN (Variable-Length User Data) keyword for ICF files</h1>
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<div><p>Use this record-level keyword to indicate that the length of the
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record sent across the line is variable. The length is specified at run time
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in the field parameter.</p>
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<div class="section"><div class="p">The format of the keyword is: <pre>VARLEN(&field-name);</pre>
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</div>
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<p>The &field-name
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parameter is required and specifies the name of the field that contains the
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length of the user data to be sent. The field name must exist in the record
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format and the field must be defined as a zoned field of length 5, data type
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S, usage P, and zero decimal positions.</p>
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<p>The length value set in the
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parameter field is the length of the user data and does not include indicators.
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The length value is specified in decimal and is checked at run time. The
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value should not be greater than the length of the DDS record format. The
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maximum value depends on the communication type you are using.</p>
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<p>VARLEN
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is valid only on output operations.</p>
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<p>VARLEN is ignored at run time when
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an CANCEL, EOS, FAIL, NEGRSP, RSPCONFIRM, or RQSWRT keyword is in effect.
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These keywords must have option indicators when they apply to a record that
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has the VARLEN keyword specified. If a CANCEL, EOS, FAIL, NEGRSP, or RQSWRT
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keyword with no option indicator applies to a record for which VARLEN applies,
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an error message is issued and the VARLEN keyword is ignored at creation time.</p>
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<p>At
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least one data field (usage B or blank) for the user data must be specified
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in the record format.</p>
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<p>You cannot specify VARLEN with the TIMER keyword.</p>
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<p>Option
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indicators are not valid for this keyword.</p>
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</div>
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<div class="example"><h4 class="sectiontitle">Example</h4> <p>The following example shows how to specify
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the VARLEN keyword.</p>
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<pre>|...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8
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A R RCD VARLEN(&LENFLD);
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A DATAFLD 32760A
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A LENFLD 5S P
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A</pre>
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<p>On an output operation to RCD, the length of the data
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in DATAFLD that is sent across the line will be the length set in LENFLD.</p>
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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="rzakemstckeyw.htm" title="These topics contain the keyword entries that you can specify when you define ICF files.">DDS keyword entries for ICF files (positions 45 through 80)</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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