code39.htm

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<HTML><HEAD><TITLE> Drawing Barcodes in  Code 39 </TITLE>
<META http-equiv=Content-Type content="text/html; charset=iso-8859-1">
<LINK 
href="global.css" 
type=text/css rel=stylesheet>
<META content="MSHTML 5.50.4807.2300" name=GENERATOR></HEAD>
<BODY text=black vLink=purple aLink=red link=blue bgColor=white leftMargin=3 
topMargin=3>
<TABLE cellSpacing=0 cellPadding=1 border=0 style="WIDTH: 762px; HEIGHT: 3547px">
  <TBODY>
  <TR vAlign=top>
    <TD vAlign=top bgColor=#fbedbb rowSpan=2></TD>
    
    <TD align=right width="100%" bgColor=white>
      <DIV align=right>&nbsp;</DIV></TD></TR>
  <TR>
    <TD vAlign=top width="100%"><!-- Article Starts -->
      <H2 align=center>Introduction</H2>
      <P>         A recent project 
      at work required that I write out barcode characters and read&nbsp;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

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