105 lines
6.6 KiB
HTML
105 lines
6.6 KiB
HTML
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<!DOCTYPE html
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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Process double-byte characters" />
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<meta name="abstract" content="Due to the large number of double-byte characters, the system needs more information to identify each double-byte character than is needed to identify each alphanumeric character." />
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<meta name="description" content="Due to the large number of double-byte characters, the system needs more information to identify each double-byte character than is needed to identify each alphanumeric character." />
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Process double-byte characters</title>
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</head>
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<body id="rbagsprocessdbchars"><a name="rbagsprocessdbchars"><!-- --></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">Process double-byte characters</h1>
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<div><p>Due to the large number of double-byte characters, the system needs
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more information to identify each double-byte character than is needed to
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identify each alphanumeric character.</p>
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<p>There are two types of double-byte characters: basic and
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extended. These characters are typically processed by the device on which
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the characters are displayed or printed.</p>
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<div class="section"><h4 class="sectiontitle">Basic double-byte characters:</h4><p>Basic characters are
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frequently used double-byte characters that reside in the hardware of a DBCS-capable
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device. The number of double-byte characters stored in the device varies with
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the language supported and the storage size of the device. A DBCS-capable
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device can display or print basic characters without using the extended character
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processing function of the operating system.</p>
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</div>
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<div class="section"><h4 class="sectiontitle">Double-byte extended characters:</h4><p>When processing
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extended characters, the device requires the assistance of the system. The
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system must tell the device what the character looks like before the device
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can display or print the character. Extended characters are stored in a DBCS
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font table, not in the DBCS-capable device. When displaying or printing extended
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characters, the device receives them from the DBCS font table under control
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of the operating system.</p>
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<p>Extended character processing is a function
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of the operating system that is required to make characters stored in a DBCS
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font table available to a DBCS-capable device.</p>
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<p>To request extended character
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processing, specify the double-byte extended character parameter, IGCEXNCHR(*YES),
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on the file creation command when you create a display (CRTDSPF) or create
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a printer file (CRTPRTF) command that processes double-byte data. Because
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IGCEXNCHR(*YES) is the default value, the system automatically processes extended
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characters unless you instruct it otherwise. You can change this file attribute
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by using the change file (CHGDSPF) or (CHGPRTF) command. You can override
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the file attribute with the override display file (OVRDSPF) or override printerfile
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(OVRPRTF) command. For example, to override the display file DBCSDSPF so that
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extended characters are processed, enter:</p>
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<pre>OVRDSPF DSPF(DBCSDSPF) IGCEXNCHR(*YES)</pre>
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<div class="note"><span class="notetitle">Notes:</span> <ol><li>The system ignores the IGCEXNCHR parameter when processing alphanumeric
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files.</li>
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<li>When you use the Japanese 5583 Printer to print extended characters, you
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must use the Kanji print function of the Advanced DBCS Printer Support licensed
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program.</li>
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</ol>
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</div>
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</div>
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<div class="section"><h4 class="sectiontitle">What happens when extended characters are not processed:</h4><p>When extended characters are not processed, the following
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events happen:</p>
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<ul><li>Basic double-byte characters are displayed and printed.</li>
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<li>On displays, the system displays the undefined character
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where it would otherwise display extended characters.</li>
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<li>On printed output, the system prints the undefined character
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where it would otherwise print extended characters.</li>
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<li>The extended characters, though not displayed or printed, are stored correctly
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in the system.</li>
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</ul>
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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="rbagsdesigndbcsapps.htm" title="Design your application programs for processing double-byte data in the same way you design application programs for processing alphanumeric data.">Develop applications that process DBCS data</a></div>
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</div>
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<div class="relref"><strong>Related reference</strong><br />
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<div><a href="../cl/crtdspf.htm">Create Display File (CRTDSPF) command</a></div>
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<div><a href="../cl/crtprtf.htm">Create Printer File (CRTPRTF) command</a></div>
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<div><a href="../cl/chgdspf.htm">Change Display File (CHGDSPF) command</a></div>
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<div><a href="../cl/chgprtf.htm">Change Printer File (CHGPRTF) command</a></div>
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<div><a href="../cl/ovrdspf.htm">Override with Display File (OVRDSPF) command</a></div>
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<div><a href="../cl/ovrprtf.htm">Override with Printer File (OVRPRTF) command</a></div>
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</div>
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</div>
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</body>
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</html> |