81 lines
5.9 KiB
HTML
81 lines
5.9 KiB
HTML
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<meta name="DC.Title" content="Override file attributes" />
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<meta name="abstract" content="Overriding file attributes is the simplest form of overriding a file." />
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<meta name="DC.subject" content="overriding file, attribute, overriding, overriding file, device, applying, example, attributes of printer file, printer file used in program, building, using high-level language programs, applying override, when using high-level language application programs, using override commands, command, CL, OVRPRTF (Override with Printer File), basic example, merging, merging attributes, override, file, open data path (ODP), Override with Printer File (OVRPRTF), open data path (ODP), overrides, ODP (open data path), Override with Printer File (OVRPRTF) command, OVRPRTF (Override with Printer File) command" />
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<title>Override file attributes</title>
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</head>
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<body id="rbal3ovrfa"><a name="rbal3ovrfa"><!-- --></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">Override file attributes</h1>
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<div><p>Overriding file attributes is the simplest form of overriding a
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file. </p>
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<div class="p">File attributes are built as a result of the following actions: <ul><li>Create file and add member commands. Initially, these commands build the
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file attributes.</li>
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<li>Program using the files. At compile time, the user program can specify
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some of the file attributes. (The attributes that you can specify depend on
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the high-level language in which the program is written.)</li>
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<li>Override commands. At the time when a program runs, these commands can
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override the file attributes previously built by the merging of the file description
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and the file parameters specified in the user program.</li>
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</ul>
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For example, assume that you create a printer file OUTPUT whose attributes
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are: <ul><li>Page size of 60 by 80</li>
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<li>Six lines per inch</li>
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<li>Two copies of printed output</li>
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<li>Two pages for file separators</li>
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<li>Overflow line number of 55</li>
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</ul>
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The <a href="../cl/crtprtf.htm">Create
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Printer File (CRTPRTF)</a> command looks like this: <pre>CRTPRTF FILE(QGPL/OUTPUT) SPOOL(*YES) +
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PAGESIZE(60 80) LPI(6) COPIES(2) +
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FILESEP(2) OVRFLW(55)</pre>
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</div>
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<p>You specify the printer file OUTPUT in your application program with an
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overflow line number of 58 and a page size of 66 by 132.</p>
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<div class="p">However, before you run the application program, you want to change the
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number of printed copies to 3, and the overflow line to 60. The override command
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looks like this: <pre>OVRPRTF FILE(OUTPUT) COPIES(3) OVRFLW(60)</pre>
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Then
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you call the application program, and three copies of the output print.</div>
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<p>When the application program opens the OUTPUT file, the server merges the
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file-specified attributes, program-specified attributes, and override-specified
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attributes to form the open data path. The server uses the open data path
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when the program runs. The server merges file-specified overrides with the
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program-specified attributes first. Then it merges these merged attributes
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with the override attributes. In this example, when the OUTPUT file is opened
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and output operations are performed, spooled output will be produced with
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a page size of 66 by 132, six lines per inch, three copies, two file separator
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pages, and overflow at 60 lines.</p>
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<p><a href="#rbal3ovrfa__rv2h087">Figure 1</a> explains this example.</p>
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<div class="fignone" id="rbal3ovrfa__rv2h087"><a name="rbal3ovrfa__rv2h087"><!-- --></a><span class="figcap">Figure 1. Override file attributes</span><br /><img src="rv2h087.gif" alt="Overriding file attributes" /><br /></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="rbal3applyovr.htm" title="You can perform two general types of overrides, which are file overrides and overrides for program device entries.">Apply overrides</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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