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<html><head><title>The EXIF documentation file: The EXIF Package</title>
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<table width="66%" border="0" cellpadding="0" cellspacing="0"><tr><td><table width="100%" border="0" cellpadding="2" cellspacing="1">
<tr valign="top"><td width="33%" bgcolor="#666666" class="header">The EXIF documentation file</td><td width="33%" bgcolor="#666666" class="header">D. New</td></tr>
<tr valign="top"><td width="33%" bgcolor="#666666" class="header"> </td><td width="33%" bgcolor="#666666" class="header">February 12, 2002</td></tr>
</table></td></tr></table>
<div align="right"><font face="monaco, MS Sans Serif" color="#990000" size="+3"><b><br><span class="title">The EXIF Package</span></b></font></div>
<font face="verdana, helvetica, arial, sans-serif" size="2">
<h3>Abstract</h3>
<p>
Tcl EXIF extracts and parses EXIF fields from digital images.
</p>
<a name="toc"><br><hr size="1" shade="0"></a>
<table border="0" cellpadding="0" cellspacing="2" width="30" height="15" align="right"><tr><td bgcolor="#990000" align="center" width="30" height="15"><a href="#toc" CLASS="link2"><font face="monaco, MS Sans Serif" color="#ffffff" size="1"><b> TOC </b></font></a><br></td></tr></table>
<h3>Table of Contents</h3>
<ul compact class="toc">
<b><a href="#anchor1">1.</a>
Synopsis<br></b>
<b><a href="#anchor2">2.</a>
Details<br></b>
<b><a href="#anchor3">3.</a>
Copyrights<br></b>
<b><a href="#anchor4">4.</a>
Acknowledgements<br></b>
</ul>
<br clear="all">
<a name="anchor1"><br><hr size="1" shade="0"></a>
<table border="0" cellpadding="0" cellspacing="2" width="30" height="15" align="right"><tr><td bgcolor="#990000" align="center" width="30" height="15"><a href="#toc" CLASS="link2"><font face="monaco, MS Sans Serif" color="#ffffff" size="1"><b> TOC </b></font></a><br></td></tr></table>
<h3>1. Synopsis</h3>
</font><pre>
package provide exif 1.0
</pre><font face="verdana, helvetica, arial, sans-serif" size="2">
<p>
The EXIF package is a recoding of Chris Breeze's Perl package to do the same
thing. This version accepts a channel as input and returns a serialized
array with all the recognised fields parsed out.
</p>
<p>
There is also a function to obtain a list of all possible field names that
might be present, which is useful in building GUIs that present such
information.
</p>
<a name="anchor2"><br><hr size="1" shade="0"></a>
<table border="0" cellpadding="0" cellspacing="2" width="30" height="15" align="right"><tr><td bgcolor="#990000" align="center" width="30" height="15"><a href="#toc" CLASS="link2"><font face="monaco, MS Sans Serif" color="#ffffff" size="1"><b> TOC </b></font></a><br></td></tr></table>
<h3>2. Details</h3>
</font><pre>
array set answer [exif::analyze $channel]
</pre><font face="verdana, helvetica, arial, sans-serif" size="2">
<p>
$channel should be an open file handle rewound
to the start. It does not need to be seekable.
$channel will be set to binary mode and is left
wherever it happens to stop being parsed, usually
at the end of the file or the start of the image
data. You must open and close the stream yourself.
If no error is thrown, the return value is a
serialized array with informative English text
about what was found in the EXIF block. Failure
during parsing or I/O throw errors.
</p>
</font><pre>
set names [exif::fieldnames]
</pre><font face="verdana, helvetica, arial, sans-serif" size="2">
<p>
This returns a list of all possible field names.
That is, the array returned by exif::analyze will
not contain keys that are not listed in the return
from exif::fieldnames. Of course, if information is
missing in the image file, exif::analyze may not
return all the fields listed in the return from
exif::fieldnames. This function is expected to be
primarily useful for building GUIs to display results.
N.B.: Read the implementation of exif::fieldnames
before modifying the implementation of exif::analyze.
</p>
<a name="anchor3"><br><hr size="1" shade="0"></a>
<table border="0" cellpadding="0" cellspacing="2" width="30" height="15" align="right"><tr><td bgcolor="#990000" align="center" width="30" height="15"><a href="#toc" CLASS="link2"><font face="monaco, MS Sans Serif" color="#ffffff" size="1"><b> TOC </b></font></a><br></td></tr></table>
<h3>3. Copyrights</h3>
<p>
(c) 2002 Darren New
</p>
<p>
Hold harmless the author, and any lawful use is allowed.
</p>
<a name="anchor4"><br><hr size="1" shade="0"></a>
<table border="0" cellpadding="0" cellspacing="2" width="30" height="15" align="right"><tr><td bgcolor="#990000" align="center" width="30" height="15"><a href="#toc" CLASS="link2"><font face="monaco, MS Sans Serif" color="#ffffff" size="1"><b> TOC </b></font></a><br></td></tr></table>
<h3>4. Acknowledgements</h3>
<p>
This code is a direct translation of version 1.3 of exif.pl by Chris
Breeze. See the source for full headers, references, etc.
</p>
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