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<LINK REL="Prev" HREF="35DetailedstepstoinstallJpGraph.html">
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<LINK REL="Next" HREF="37CompilingPHP4.html">
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</HEAD>
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<BODY>
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<A HREF="toc.html">Contents</A>
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<A HREF="35DetailedstepstoinstallJpGraph.html">Previous</A>
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<A HREF="37CompilingPHP4.html">Next</A>
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<HR NOSHADE>
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<H2><A NAME="3_6">3.6 Troubleshooting your installation</A></H2>
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<P> For 99% of the users this library will work directly with a recent
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installation of PHP without any problem.</P>
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<P> Experience shows that most of the trouble are caused by either an
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old buggy version of the free-type TTF library or using an old
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antiquated version of the GD library. In order to narrow it down the
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problem the following steps is helpful.</P>
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<OL>
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<LI> If no background images are displayed (instead a solid black box
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are displayed) chances are that GD 2.x is available but the
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jpg-config.inc.php has been changed so that true color images are
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disabled. Correct this by enabling the USE_TRUECOLOR define.</LI>
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<LI> If background images does not work make sure the settings of
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USE_GD2_LIBRARY corresponds to the actual installation, i.e. If the GD2
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library is not available then this define must be false!</LI>
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<LI> If you are running IIS and Win2k and get the error "Can't find
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font" when trying to use TTF fonts then try to change the paths to UNIX
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style, i.e. "/usr/local/fonts/ttf/". Remember that the path is absolute
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and not relative to the htdocs catalogue.</LI>
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<LI> If no images and no error messages gets sent back to the browser
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then there is a big chance that HTTP-Server PHP module (e.g.
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Apache-PHP) has crashed. This is often due to a broken PHP installation
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and more than often a problem with the True Type libraries. The best
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way to track these types of problem down is to investigate the
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HTTP-Server logs or the general system logs for evidence of a PHP
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crash. The other reasons is that in some rare cases the auto detection
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of the GD library could fail. If only the GD1 library is available and
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the JpGraph library mistakenly detects the GD2 this could in rare cases
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cause PHP to crash. Please try re-run the example by setting the DEFINE
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USE_GD2_LIBRARY to "false".</LI>
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<LI> If the system is running IIS on Windows and some images which uses
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TTF fonts just return an empty page then try to set the TTF_DIR path
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manually (in jpg-config.php) to the directory where all the TTF fonts
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are stored (normally c:/WINDOWS/fonts)</LI>
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<LI> If the cache is enabled please make sure that the permissions are
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correctly set for the cache directory so that the process running
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Apache/PHP has write access to the cache directory.</LI>
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<LI> If the TTF fonts only shows up as yellow then you have a buggy
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installation of the freetype font library and the only thing to do is
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to re-install and setup PHP+GD again.</LI>
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</OL>
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<P></P>
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<HR NOSHADE>
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<A HREF="toc.html">Contents</A>
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<A HREF="35DetailedstepstoinstallJpGraph.html">Previous</A>
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<A HREF="37CompilingPHP4.html">Next</A>
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