76 lines
6.0 KiB
HTML
76 lines
6.0 KiB
HTML
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html lang="en-us" xml:lang="en-us">
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<meta name="DC.Title" content="Double-byte character set fundamentals" />
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<meta name="abstract" content="Some languages, such as Chinese, Japanese, and Korean, have a writing scheme that uses many different characters that cannot be represented with single-byte codes. To create coded character sets for such languages, the server uses two bytes to represent each character. Characters that are encoded in two-byte code are called double-byte characters." />
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<meta name="description" content="Some languages, such as Chinese, Japanese, and Korean, have a writing scheme that uses many different characters that cannot be represented with single-byte codes. To create coded character sets for such languages, the server uses two bytes to represent each character. Characters that are encoded in two-byte code are called double-byte characters." />
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<meta name="DC.subject" content="DBCS (double-byte character set), definition, double-byte data, basic information" />
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<meta name="keywords" content="DBCS (double-byte character set), definition, double-byte data, basic information" />
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<meta name="DC.Relation" scheme="URI" content="rbal3dbcscs.htm" />
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<meta name="DC.Relation" scheme="URI" content="rbal3scdbc.htm" />
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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>Double-byte character set fundamentals</title>
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</head>
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<body id="rbal3dbcsf"><a name="rbal3dbcsf"><!-- --></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">Double-byte character set fundamentals</h1>
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<div><p>Some languages, such as Chinese, Japanese, and Korean, have a writing
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scheme that uses many different characters that cannot be represented with
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single-byte codes. To create coded character sets for such languages, the
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server uses two bytes to represent each character. Characters that are encoded
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in two-byte code are called double-byte characters.</p>
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<div class="section"><p><a href="#rbal3dbcsf__hrsl338">Figure 1</a> shows alphanumeric characters
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coded in a single-byte code scheme and double-byte characters coded in a double-byte
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code scheme.</p>
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</div>
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<div class="section"><p>You can use double-byte characters as well as single-byte characters
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in one application. For instance, you might want to store double-byte data
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and single-byte data in your database, create your display screens with double-byte
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text and fields, or print reports with double-byte characters.</p>
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</div>
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<div class="section"> <div class="fignone" id="rbal3dbcsf__hrsl338"><a name="rbal3dbcsf__hrsl338"><!-- --></a><span class="figcap">Figure 1. Single-byte and double-byte
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code schemes</span><br /><img src="rv3h013.gif" alt="Graphic showing examples
of hexadecimal codes for single-byte and double-byte characters." /><br /></div>
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</div>
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</div>
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<div>
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<ul class="ullinks">
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<li class="ulchildlink"><strong><a href="rbal3dbcscs.htm">DBCS code scheme</a></strong><br />
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IBM<sup>®</sup> supports
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two DBCS code schemes: one for the host servers, the other for personal computers.</li>
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<li class="ulchildlink"><strong><a href="rbal3scdbc.htm">Shift-control double-byte characters</a></strong><br />
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When the IBM-host code scheme is used, the server uses shift-control characters to identify the beginning and end of a string of double-byte characters. The shift-out (SO) character, hex 0E, indicates the beginning of a double-byte character string. The shift-in (SI) character, hex 0F, indicates the end of a double-byte character string.</li>
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<li class="ulchildlink"><strong><a href="rbal3idbc.htm">Invalid double-byte code and undefined double-byte code</a></strong><br />
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Invalid double-byte code has a double-byte code value that is not in the valid double-byte code range. The IBM-Host code scheme in the DBCS code scheme topic shows valid double-byte code ranges. This is in contrast to undefined double-byte code where the double-byte code is valid, but no graphic symbol has been defined for the code.</li>
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<li class="ulchildlink"><strong><a href="rbal3usingdbd.htm">Use double-byte data</a></strong><br />
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This section describes where you can use double-byte data and discusses the limitations to its use.</li>
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<li class="ulchildlink"><strong><a href="rbal3dbcsize.htm">Double-byte character size</a></strong><br />
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When displayed or printed, double-byte characters typically are twice as wide as single-byte characters.</li>
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</ul>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rbal3dbcs.htm" title="This section contains information that you need if you use double-byte characters.">Double-byte character set support</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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