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postnet: USPS POSTNET Barcode Encoding🔗ℹ
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1 Introduction🔗ℹ
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This postnet Racket package can be used to generate the United States Postal
Service POSTNET barcode binary pattern, as described in Chapter 4 of USPS
Publication 25, “Designing Letter and Reply Mail,” dated 2003-06. This
package supports ZIP, ZIP+4, and DBPC codes.
The generated binary representation is a Racket list of boolean
values. Separate code must be written to render this representation to a
particular printing devices.
2 Encoding🔗ℹ
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There are several procedures for encoding POSTNET from various input
representations. It is suspected that most applications will encode from a
string representation, using string->postnet.
(digit-list->postnet digits) → (listof boolean?)
|
| digits : (listof exact-positive-integer?) |
Yields a POSTNET encoding of a list of digit numbers. For example:
> (digit-list->postnet '(1 2 3 4 5))
| (#t #f #f #f #t #t #f #f #t #f #t #f #f #t #t #f |
| #f #t #f #f #t #f #t #f #t #f #f #t #f #t #f #t) |
(char-list->postnet chars) → (listof boolean?)
|
| chars : (listof char?) |
Yields a POSTNET encoding of a list of characters. For example:
> (char-list->postnet '(#\1 #\2 #\3 #\4 #\5))
| (#t #f #f #f #t #t #f #f #t #f #t #f #f #t #t #f |
| #f #t #f #f #t #f #t #f #t #f #f #t #f #t #f #t) |
(string->postnet str) → (listof boolean?)
|
| str : string? |
Yields a POSTNET encoding of a string. For example:
> (string->postnet "12345-6789 01")
| (#t #f #f #f #t #t #f #f #t #f #t #f #f #t #t #f |
| #f #t #f #f #t #f #t #f #t #f #f #t #t #f #f #t |
| #f #f #f #t #t #f #f #t #f #t #f #t #f #f #t #t |
| #f #f #f #f #f #f #t #t #f #t #f #f #t #t) |
3 Debugging🔗ℹ
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Although this package does not render POSTNET for OCR use, for
debugging purposes, the postnet->debug-string procedure can be used to approximate the barcode visually, using
ASCII characters.
(postnet->debug-string postnet) → string?
|
| postnet : (listof boolean?) |
Yields a string visual approximation of a POSTNET encoding. For example:
| > (postnet->debug-string (string->postnet "12345")) |
| "|...||..|.|..||..|..|.|.|..|.|.|" |
4 History🔗ℹ
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Version 2:0 — 2016-02-28
Version 1:1 — 2011-08-22
Version 1:0 — 2009-03-03
Licensed changed to LGPL 3.
Converted to author’s new Scheme administration system.
Previous version was erroneously in planet as package "postnet-planet.plt".
Version 0.2 — 2005-07-12
Version 0.1 — 2004-04-14
5 Legal🔗ℹ
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Copyright 2004, 2005, 2009, 2011, 2016 Neil Van Dyke. This program is Free
Software; you can redistribute it and/or modify it under the terms of the GNU
Lesser General Public License as published by the Free Software Foundation;
either version 3 of the License, or (at your option) any later version. This
program is distributed in the hope that it will be useful, but without any
warranty; without even the implied warranty of merchantability or fitness for a
particular purpose. See http://www.gnu.org/licenses/ for details. For other
licenses and consulting, please contact the author.
