📄 code128a.htm

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<META HTTP-EQUIV="Content-Type" Content="text/html; charset=Windows-1252">
<title>Code-128 A</title>
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<h1>Code-128 A</h1>
<img src="sample_images/code128a.gif" align="center"> (GIF)
<BR>
<img src="sample_images/code128a.jpg" align="center"> (JPEG)
<BR>
<img src="sample_images/code128a.png" align="center"> (PNG)
<P>
Code-128 A is a continuous barcode. Its character set is ASCII 0 to 95 plus 
special characters SHIFT, CODE_C, CODE_B. It has one check character (not 
shown as part of the display text).
<P>
The special characters have the following barcode-defined native values:
<PRE>
	SHIFT = 98
	CODE_C = 99
	CODE_B = 100
</PRE>
When using these characters in the Data property, you must add 128 to the 
above native values in order to distinguish them from normal ASCII characters, 
i.e., use
<PRE>
	98 + 128 = 226 for SHIFT (or 0xE2 in hex)
	99 + 128 = 227 for CODE_C (or 0xE3 in hex)
	100 + 128 = 228 for CODE_B (or 0xE4 in hex)
</PRE>
These characters make it possible to mix Code-128 A, Code-128 B and Code-128 
C characters in one barcode:
<blockquote>
SHIFT indicates the next one character will be encoded using Code-128 
B character set (if the current character set is Code-128 A)
<P>
CODE_C indicates starting with the next character, Code-128 C set will 
be used.
<P>
CODE_B indicates starting with the next character, Code-128 B set will 
be used.
</blockquote>

In the barcode image above, there's a CODE_C between W4 and 13, i.e., the 
9th character has code:
<PRE>
	99 + 128 = 227 (or 0xE3 in hex)
</PRE>
in the Data property. Consequently the characters starting with 13 are actually 
encoded using the Code-128 C character set.

On Windows, you can enter special 
characters by keeping the ALT key pressed and typing 0 followed by the 
character code (e.g. 227).
<p>
In a URL, you'll need to URL-encode the character; 227 (0xE3) will be encoded
as %u00E3. The barcode data above would look like the following in a URL,
<pre>
	1Z0413W4%u00E31302528989
</pre>
<p>
<b>See Also</b></p>
<p>
<A HREF="code128b.htm">Code-128 B</A>, <A HREF="code128c.htm">Code-128 C</A>
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