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<HTML><HEAD><TITLE> Drawing Barcodes in Code 39 </TITLE>
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<H2 align=center>Introduction</H2>
<P> A recent project
at work required that I write out barcode characters and read them. This
experience inspired me to start a side project writing some code that renders a
barcode on the Windows screen, given the proper input. This is the
result of that project.</P>
<H2 align=center>Code 39 basics</H2>
<P>This first article is about drawing Code 39 barcodes on the Windows
screen. Before I start discussing the code, we'll need to know some basic
facts about the Code 39 barcode symbology. Code 39 was the first
alphanumeric symbology developed, and is widely used in industrial
settings. Code 39 has two different element widths, wide and narrow, which
are usually specified by giving the narrow width and the narrow/wide
ratio. Each Code 39 character has five bars and four spaces for a total of
nine elements. Of the nine elements, three are wide and six are narrow,
leading to the name Code 39 (3 of 9). Each character is followed by an
inter-character gap, usually equal to the width of a narrow element. The
44 characters in the Code 39 symbology are listed below:</P>
<TABLE cellSpacing=0 cellPadding=0 width="100%" border=0>
<COLGROUP>
<COL width=20>
<COL width=236>
<TBODY>
<TR vAlign=top>
<TD width="12%" <P>Character
<P></P></TD>
<TD width="88%" <P>Pattern (bsbsbsbsb)
<P></P></TD></TR>
<TR vAlign=top>
<TD align=left width="12%" <P>1
<P></P></TD>
<TD width="88%" <P>wnnwnnnnw</TD></TR>
<TR vAlign=top>
<TD align=left width="12%" <P>2
<P></P></TD>
<TD width="88%" <P>nnwwnnnnw
<P></P></TD></TR>
<TR vAlign=top>
<TD align=left width="12%" <P>3
<P></P></TD>
<TD width="88%" <P>wnwwnnnnn
<P></P></TD></TR>
<TR vAlign=top>
<TD align=left width="12%" <P>4
<P></P></TD>
<TD width="88%" <P>nnnwwnnnw
<P></P></TD></TR>
<TR vAlign=top>
<TD align=left width="12%" <P>5
<P></P></TD>
<TD width="88%" <P>wnnwwnnnn
<P></P></TD></TR>
<TR vAlign=top>
<TD align=left width="12%" <P>6
<P></P></TD>
<TD width="88%" <P>nnwwwnnnn
<P></P></TD></TR>
<TR vAlign=top>
<TD align=left width="12%" <P>7
<P></P></TD>
<TD width="88%" <P>nnnwnnwnw
<P></P></TD></TR>
<TR vAlign=top>
<TD align=left width="12%" <P>8
<P></P></TD>
<TD width="88%" <P>wnnwnnwnn
<P></P></TD></TR>
<TR vAlign=top>
<TD align=left width="12%" <P>9
<P></P></TD>
<TD width="88%" <P>nnwwnnwnn
<P></P></TD></TR>
<TR vAlign=top>
<TD align=left width="12%" <P>0
<P></P></TD>
<TD width="88%" <P>nnnwwnwnn
<P></P></TD></TR>
<TR vAlign=top>
<TD width="12%" <P>A
<P></P></TD>
<TD width="88%" <P>wnnnnwnnw
<P></P></TD></TR>
<TR vAlign=top>
<TD width="12%" <P>B
<P></P></TD>
<TD width="88%" <P>nnwnnwnnw
<P></P></TD></TR>
<TR vAlign=top>
<TD width="12%" <P>C
<P></P></TD>
<TD width="88%" <P>wnwnnwnnn
<P></P></TD></TR>
<TR vAlign=top>
<TD width="12%" <P>D
<P></P></TD>
<TD width="88%" <P>nnnnwwnnw
<P></P></TD></TR>
<TR vAlign=top>
<TD width="12%" <P>E
<P></P></TD>
<TD width="88%" <P>wnnnwwnnn
<P></P></TD></TR>
<TR vAlign=top>
<TD width="12%" <P>F
<P></P></TD>
<TD width="88%" <P>nnwnwwnnn
<P></P></TD></TR>
<TR vAlign=top>
<TD width="12%" <P>G
<P></P></TD>
<TD width="88%" <P>nnnnnwwnw
<P></P></TD></TR>
<TR vAlign=top>
<TD width="12%" <P>H
<P></P></TD>
<TD width="88%" <P>wnnnnwwnn
<P></P></TD></TR>
<TR vAlign=top>
<TD width="12%" <P>I
<P></P></TD>
<TD width="88%" <P>nnwnnwwnn
<P></P></TD></TR>
<TR vAlign=top>
<TD width="12%" <P>J
<P></P></TD>
<TD width="88%" <P>nnnnwwwnn
<P></P></TD></TR>
<TR vAlign=top>
<TD width="12%" <P>K
<P></P></TD>
<TD width="88%" <P>wnnnnnnww
<P></P></TD></TR>
<TR vAlign=top>
<TD width="12%" <P>L
<P></P></TD>
<TD width="88%" <P>nnwnnnnww
<P></P></TD></TR>
<TR vAlign=top>
<TD width="12%" <P>M
<P></P></TD>
<TD width="88%" <P>wnwnnnnwn
<P></P></TD></TR>
<TR vAlign=top>
<TD width="12%" <P>N
<P></P></TD>
<TD width="88%" <P>nnnnwnnww
<P></P></TD></TR>
<TR vAlign=top>
<TD width="12%" <P>O
<P></P></TD>
<TD width="88%" <P>wnnnwnnwn
<P></P></TD></TR>
<TR vAlign=top>
<TD width="12%" <P>P
<P></P></TD>
<TD width="88%" <P>nnwnwnnwn
<P></P></TD></TR>
<TR vAlign=top>
<TD width="12%" <P>Q
<P></P></TD>
<TD width="88%" <P>nnnnnnwww
<P></P></TD></TR>
<TR vAlign=top>
<TD width="12%" <P>R
<P></P></TD>
<TD width="88%" <P>wnnnnnwwn
<P></P></TD></TR>
<TR vAlign=top>
<TD width="12%" <P>S
<P></P></TD>
<TD width="88%" <P>nnwnnnwwn
<P></P></TD></TR>
<TR vAlign=top>
<TD width="12%" <P>T
<P></P></TD>
<TD width="88%" <P>nnnnwnwwn
<P></P></TD></TR>
<TR vAlign=top>
<TD width="12%" <P>U
<P></P></TD>
<TD width="88%" <P>wwnnnnnnw
<P></P></TD></TR>
<TR vAlign=top>
<TD width="12%" <P>V
<P></P></TD>
<TD width="88%" <P>nwwnnnnnw
<P></P></TD></TR>
<TR vAlign=top>
<TD width="12%" <P>W
<P></P></TD>
<TD width="88%" <P>wwwnnnnnn
<P></P></TD></TR>
<TR vAlign=top>
<TD width="12%" <P>X
<P></P></TD>
<TD width="88%" <P>nwnnwnnnw
<P></P></TD></TR>
<TR vAlign=top>
<TD width="12%" <P>Y
<P></P></TD>
<TD width="88%" <P>wwnnwnnnn
<P></P></TD></TR>
<TR vAlign=top>
<TD width="12%" <P>Z
<P></P></TD>
<TD width="88%" <P>nwwnwnnnn
<P></P></TD></TR>
<TR vAlign=top>
<TD width="12%" <P>-
<P></P></TD>
<TD width="88%" <P>nwnnnnwnw
<P></P></TD></TR>
<TR vAlign=top>
<TD width="12%" <P>.
<P></P></TD>
<TD width="88%" <P>wwnnnnwnn
<P></P></TD></TR>
<TR vAlign=top>
<TD width="12%" <P>SPACE
<P></P></TD>
<TD width="88%" <P>nwwnnnwnn
<P></P></TD></TR>
<TR vAlign=top>
<TD width="12%" <P>*
<P></P></TD>
<TD width="88%" <P>nwnnwnwnn
<P></P></TD></TR>
<TR vAlign=top>
<TD width="12%" <P>$
<P></P></TD>
<TD width="88%" <P>nwnwnwnnn
<P></P></TD></TR>
<TR vAlign=top>
<TD width="12%" <P>/
<P></P></TD>
<TD width="88%" <P>nwnwnnnwn
<P></P></TD></TR>
<TR vAlign=top>
<TD width="12%" <P>+
<P></P></TD>
<TD width="88%" <P>nwnnnwnwn
<P></P></TD></TR>
<TR vAlign=top>
<TD width="12%" <P>%
<P></P></TD>
<TD width="88%" <P>nnnwnwnwn
<P></P></TD></TR></TBODY></TABLE>
<P>A Code 39 message begins and ends with an asterisk, which serves as
this symbologies start/stop code. A sample Code 39 message 揇ATA?? 快捷鍵說明
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