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Barcode39 Image not displayed in Linux
http://www.open-audit.org/phpBB3/viewtopic.php?f=5&t=3619
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Author:  asha2005 [ Wed Apr 21, 2010 7:58 pm ]
Post subject:  Barcode39 Image not displayed in Linux

Dear Friends,
I'm newbie to Open-Audit. Iam using barcode.php to generate code39 image. Its working finely with Windows. But I'm using my intranet server using Fedora Core 7 and PHP 5.2.3. Please advise me to fix the problem.

test.php
++++++++++

<IMG SRC="barcode.php?barcode=HELLO&quality=75">
<IMG SRC="barcode.php?barcode=123456&width=320&height=200">

barcode.php
++++++++++++++

<?php
/*===========================================================================*/
/* PHP Barcode Image Generator v1.0 [9/28/2000]
Copyright (C)2000 by Charles J. Scheffold - cs@sid6581.net


---
UPDATE 5/10/2005 by C.Scheffold
Changed FontHeight to -2 if no text is to be displayed (this eliminates
the whitespace at the bottom of the image)
---
UPDATE 03/12/2005 by C.Scheffold
Added '-' character to translation table
---
UPDATE 09/21/2002 by Laurent NAVARRO - ln@altidev.com - http://www.altidev.com
Updated to be compatible with register_globals = off and on
---
UPDATE 4/6/2001 - Important Note! This script was written with the assumption
that "register_globals = On" is defined in your PHP.INI file! It will not
work as-is and as described unless this is set. My PHP came with this
enabled by default, but apparently many people have turned it off. Either
turn it on or modify the startup code to pull the CGI variables in the old
fashioned way (from the HTTP* arrays). If you just want to use the functions
and pass the variables yourself, well then go on with your bad self.
---

This code is hereby released into the public domain.
Use it, abuse it, just don't get caught using it for something stupid.


The only barcode type currently supported is Code 3 of 9. Don't ask about
adding support for others! This is a script I wrote for my own use. I do
plan to add more types as time permits but currently I only require
Code 3 of 9 for my purposes. Just about every scanner on the market today
can read it.


PARAMETERS:
-----------
$barcode = [required] The barcode you want to generate


$type = (default=0) It's 0 for Code 3 of 9 (the only one supported)

$width = (default=160) Width of image in pixels. The image MUST be wide
enough to handle the length of the given value. The default
value will probably be able to display about 6 digits. If you
get an error message, make it wider!


$height = (default=80) Height of image in pixels

$format = (default=jpeg) Can be "jpeg", "png", or "gif"

$quality = (default=100) For JPEG only: ranges from 0-100


$text = (default=1) 0 to disable text below barcode, >=1 to enable


NOTE: You must have GD-1.8 or higher compiled into PHP
in order to use PNG and JPEG. GIF images only work with
GD-1.5 and lower. (http://www.boutell.com)


ANOTHER NOTE: If you actually intend to print the barcodes
and scan them with a scanner, I highly recommend choosing
JPEG with a quality of 100. Most browsers can't seem to print
a PNG without mangling it beyond recognition.


USAGE EXAMPLES FOR ANY PLAIN OLD HTML DOCUMENT:
-----------------------------------------------


<IMG SRC="barcode.php?barcode=HELLO&quality=75">


<IMG SRC="barcode.php?barcode=123456&width=320&height=200">


*/
/*=============================================================================*/


//-----------------------------------------------------------------------------
// Startup code
//-----------------------------------------------------------------------------


if(isset($_GET["text"])) $text=$_GET["text"];
if(isset($_GET["format"])) $format=$_GET["format"];
if(isset($_GET["quality"])) $quality=$_GET["quality"];
if(isset($_GET["width"])) $width=$_GET["width"];
if(isset($_GET["height"])) $height=$_GET["height"];
if(isset($_GET["type"])) $type=$_GET["type"];
if(isset($_GET["barcode"])) $barcode=$_GET["barcode"];




if (!isset ($text)) $text = 1;
if (!isset ($type)) $type = 1;
if (empty ($quality)) $quality = 100;
if (empty ($width)) $width = 160;
if (empty ($height)) $height = 80;
if (!empty ($format)) $format = strtoupper ($format);
else $format="PNG";


switch ($type)
{
default:
$type = 1;
case 1:
Barcode39 ($barcode, $width, $height, $quality, $format, $text);
break;
}


//-----------------------------------------------------------------------------
// Generate a Code 3 of 9 barcode
//-----------------------------------------------------------------------------
function Barcode39 ($barcode, $width, $height, $quality, $format, $text)
{
switch ($format)
{
default:
$format = "JPEG";
case "JPEG":
header ("Content-type: image/jpeg");
break;
case "PNG":
header ("Content-type: image/png");
break;
case "GIF":
header ("Content-type: image/gif");
break;
}


$im = ImageCreate ($width, $height)
or die ("Cannot Initialize new GD image stream");
$White = ImageColorAllocate ($im, 255, 255, 255);
$Black = ImageColorAllocate ($im, 0, 0, 0);
//ImageColorTransparent ($im, $White);
ImageInterLace ($im, 1);



$NarrowRatio = 20;
$WideRatio = 55;
$QuietRatio = 35;


$nChars = (strlen($barcode)+2) * ((6 * $NarrowRatio) + (3 * $WideRatio) + ($QuietRatio));
$Pixels = $width / $nChars;
$NarrowBar = (int)(20 * $Pixels);
$WideBar = (int)(55 * $Pixels);
$QuietBar = (int)(35 * $Pixels);


$ActualWidth = (($NarrowBar * 6) + ($WideBar*3) + $QuietBar) * (strlen ($barcode)+2);

if (($NarrowBar == 0) || ($NarrowBar == $WideBar) || ($NarrowBar == $QuietBar) || ($WideBar == 0) || ($WideBar == $QuietBar) || ($QuietBar == 0))
{
ImageString ($im, 1, 0, 0, "Image is too small!", $Black);
OutputImage ($im, $format, $quality);
exit;
}

$CurrentBarX = (int)(($width - $ActualWidth) / 2);
$Color = $White;
$BarcodeFull = "*".strtoupper ($barcode)."*";
settype ($BarcodeFull, "string");

$FontNum = 3;
$FontHeight = ImageFontHeight ($FontNum);
$FontWidth = ImageFontWidth ($FontNum);
if ($text != 0)
{
$CenterLoc = (int)(($width-1) / 2) - (int)(($FontWidth * strlen($BarcodeFull)) / 2);
ImageString ($im, $FontNum, $CenterLoc, $height-$FontHeight, "$BarcodeFull", $Black);
}
else
{
$FontHeight=-2;
}


for ($i=0; $i<strlen($BarcodeFull); $i++)
{
$StripeCode = Code39 ($BarcodeFull[$i]);


for ($n=0; $n < 9; $n++)
{
if ($Color == $White) $Color = $Black;
else $Color = $White;


switch ($StripeCode[$n])
{
case '0':
ImageFilledRectangle ($im, $CurrentBarX, 0, $CurrentBarX+$NarrowBar, $height-1-$FontHeight-2, $Color);
$CurrentBarX += $NarrowBar;
break;


case '1':
ImageFilledRectangle ($im, $CurrentBarX, 0, $CurrentBarX+$WideBar, $height-1-$FontHeight-2, $Color);
$CurrentBarX += $WideBar;
break;
}
}


$Color = $White;
ImageFilledRectangle ($im, $CurrentBarX, 0, $CurrentBarX+$QuietBar, $height-1-$FontHeight-2, $Color);
$CurrentBarX += $QuietBar;
}


OutputImage ($im, $format, $quality);
}


//-----------------------------------------------------------------------------
// Output an image to the browser
//-----------------------------------------------------------------------------
function OutputImage ($im, $format, $quality)
{
switch ($format)
{
case "JPEG":
ImageJPEG ($im, "", $quality);
break;
case "PNG":
ImagePNG ($im);
break;
case "GIF":
ImageGIF ($im);
break;
}
}


//-----------------------------------------------------------------------------
// Returns the Code 3 of 9 value for a given ASCII character
//-----------------------------------------------------------------------------
function Code39 ($Asc)
{
switch ($Asc)
{
case ' ':
return "011000100";
case '$':
return "010101000";
case '%':
return "000101010";
case '*':
return "010010100"; // * Start/Stop
case '+':
return "010001010";
case '|':
return "010000101";
case '.':
return "110000100";
case '/':
return "010100010";
case '-':
return "010000101";
case '0':
return "000110100";
case '1':
return "100100001";
case '2':
return "001100001";
case '3':
return "101100000";
case '4':
return "000110001";
case '5':
return "100110000";
case '6':
return "001110000";
case '7':
return "000100101";
case '8':
return "100100100";
case '9':
return "001100100";
case 'A':
return "100001001";
case 'B':
return "001001001";
case 'C':
return "101001000";
case 'D':
return "000011001";
case 'E':
return "100011000";
case 'F':
return "001011000";
case 'G':
return "000001101";
case 'H':
return "100001100";
case 'I':
return "001001100";
case 'J':
return "000011100";
case 'K':
return "100000011";
case 'L':
return "001000011";
case 'M':
return "101000010";
case 'N':
return "000010011";
case 'O':
return "100010010";
case 'P':
return "001010010";
case 'Q':
return "000000111";
case 'R':
return "100000110";
case 'S':
return "001000110";
case 'T':
return "000010110";
case 'U':
return "110000001";
case 'V':
return "011000001";
case 'W':
return "111000000";
case 'X':
return "010010001";
case 'Y':
return "110010000";
case 'Z':
return "011010000";
default:
return "011000100";
}
}


?>

Author:  A_Hull [ Thu Apr 22, 2010 11:14 pm ]
Post subject:  Re: Barcode39 Image not displayed in Linux

I had a couple of issues with Ubuntu 9.10 make sure the images folder is writable by the web server, or at least the barcode image is writable (barcode.jpg from memory), it gets overwritten each time a barcode is displayed, also check....

Quote:
NOTE: You must have GD-1.8 or higher compiled into PHP
in order to use PNG and JPEG. GIF images only work with
GD-1.5 and lower.

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