79 lines
8.3 KiB
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79 lines
8.3 KiB
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<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Available error messages</title><link rel="stylesheet" type="text/css" href="manual.css"><meta name="generator" content="DocBook XSL Stylesheets V1.76.0"><link rel="home" href="index.html" title="JpGraph Manual"><link rel="up" href="ch06.html" title="Chapter 6. Error handling"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Available error messages</th></tr><tr><td width="20%" align="left"> </td><th width="60%" align="center">Chapter 6. Error handling</th><td width="20%" align="right"> </td></tr></table><hr></div><div class="sect1" title="Available error messages"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id2495499"></a>Available error messages</h2></div></div></div>
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<p>All error messages that can be generated by the library are listed in <a class="xref" href="aph.html" title="Appendix H. Error messages">Appendix H. <i>Error messages</i></a></p>
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<div class="sect2" title="Localizing error messages"><div class="titlepage"><div><div><h3 class="title"><a name="sec2.localizing-errmsg"></a>Localizing error messages</h3></div></div></div>
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<p>The library includes two (actually two and one pseudo) localizations of the
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error messages. As of version 2.5 the library supports English and German error
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messages. The choice of which localization of error messages that should be used
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can be done in two ways; either by specifying a global define in
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jpg-config.inc.php or</p>
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<p>As of version 2.5 there are three localization options</p>
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<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
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<p>English error messages ("en")</p>
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</li><li class="listitem">
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<p>German error messages ("de")</p>
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</li><li class="listitem">
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<p>Production error messages. This is not really a localization but a
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different set of error messages which does not give detailed error
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messages but a generic message suitable for a production server
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where the end user is not helped by detailed graph script errors.
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Instead a generic message is shown together with an error code that
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corresponds to the detailed error. ("prod")</p>
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</li></ol></div><p>In order to specify the error message localization the following
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define in <code class="filename">jpg-config.inc.php</code> must be set the </p>
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<p><code class="code">define('DEFAULT_ERR_LOCALE','en');</code></p>
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<p>The possible (string) options are</p>
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<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
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<p>"en", English locale</p>
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</li><li class="listitem">
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<p>"de", German locale</p>
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</li><li class="listitem">
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<p>"prod", The production version of the error messages.</p>
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</li></ol></div><p>It is also possible to dynamically set the localization of error
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messages by calling the static method
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<code class="code">JpGraphErr::SetErrLocale($aLocaleString)</code> .For example, in order
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to dynamically change to German locale the following method call would be
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used:</p>
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<p><code class="code">JpGraphErr::SetErrLocale('de');</code></p>
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<p>As an example of the German locale the "<span class="italic">Header Already Sent</span>" error message localized in
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German are shown in <a class="xref" href="ch06s02.html#fig.errmsg-de-headers-sent" title='Figure 6.3. The "Header already sent" error message using German locale'>Figure 6.3. The "Header already sent" error message using German locale</a></p>
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<div class="figure"><a name="fig.errmsg-de-headers-sent"></a><p class="title"><b>Figure 6.3. The "Header already sent" error message using German locale</b></p><div class="figure-contents">
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<div class="mediaobject"><img src="images/errmsg-headersent-de.png" alt='The "Header already sent" error message using German locale'></div>
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</div></div><br class="figure-break">
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<div class="note" title="Note" style="margin-left: 0.5in; margin-right: 0.5in;"><h3 class="title">Note</h3>
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<p>There is one potential issue with specifying the locale dynamically. Since
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the call to set the locale happens in the script at a certain point this
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means that if the error occur before that point the locale change has not
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yet happened and the default locale specified in
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<code class="filename">jpg-config.inc.php</code> will be used.</p>
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</div>
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</div>
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<div class="sect2" title="Error messages on a production server"><div class="titlepage"><div><div><h3 class="title"><a name="id2495515"></a>Error messages on a production server</h3></div></div></div>
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<p>On a production server it is common not to show detailed specific error
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messages to the public which could potentially give a away security
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vulnerabilities. For this purpose there is a "pseudo" locale of the error
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messages. This is specified by setting the locale (as described above) to the
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string "prod". If this is done a generic error message with an error code will
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be shown instead. The custom support receiving information on this error can
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then pass on the detailed error code to the development team for further
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investigation. In <a class="xref" href="ch06s02.html#fig.pseudo-locale" title='Figure 6.4. Using the production "pseudo" locale'>Figure 6.4. Using the production "pseudo" locale</a> the same error as is shown in <a class="xref" href="ch06.html#fig.errmsg-ex1" title="Figure 6.1. Typical image error message">Figure 6.1. Typical image error message</a> is displayed using the "prod" locale. As you
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can see in this case only a more end-user appropriate message together with the
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error code is displayed.</p>
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<div class="figure"><a name="fig.pseudo-locale"></a><p class="title"><b>Figure 6.4. Using the production "pseudo" locale</b></p><div class="figure-contents">
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<div class="mediaobject"><img src="images/errmsg-prod.png" alt='Using the production "pseudo" locale'></div>
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</div></div><br class="figure-break">
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<p>The problem number corresponds to the error codes that are listed in <a class="xref" href="aph.html" title="Appendix H. Error messages">Appendix H. <i>Error messages</i></a></p>
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<p>
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</p><div class="tip" title="Tip" style="margin-left: 0.5in; margin-right: 0.5in;"><h3 class="title">Tip</h3>
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<p>It is possible to customize this "production" error message by
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changing the actual text in the file
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"<code class="filename">lang/prod.inc.php</code>"</p>
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</div><p>
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</p>
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</div>
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</div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"> </td><td width="20%" align="center"><a accesskey="u" href="ch06.html">Up</a></td><td width="40%" align="right"> </td></tr><tr><td width="40%" align="left" valign="top"> </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> </td></tr></table></div></body></html>
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