476 lines
16 KiB
HTML
476 lines
16 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<HTML>
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<HEAD>
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<META HTTP-EQUIV="CONTENT-TYPE" CONTENT="text/html; charset=iso-8859-1">
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<TITLE>Magick::Exception</TITLE>
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<META NAME="GENERATOR" CONTENT="StarOffice 7 (Solaris Sparc)">
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<META NAME="AUTHOR" CONTENT="Bob Friesenhahn">
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<META NAME="CREATED" CONTENT="20020805;15113101">
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<META NAME="CHANGEDBY" CONTENT="Robert Friesenhahn">
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<META NAME="CHANGED" CONTENT="20040819;11571100">
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<META NAME="DESCRIPTION" CONTENT="Documentation for Magick::Exception class">
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<STYLE>
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<!--
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@page { size: 8.5in 11in }
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TD P { color: #000000 }
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H1 { color: #000000 }
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P { color: #000000 }
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PRE { color: #000000 }
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A:link { color: #0000ee }
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A:visited { color: #551a8b }
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</STYLE>
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</HEAD>
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<BODY LANG="en-US" TEXT="#000000" LINK="#0000ee" VLINK="#551a8b" BGCOLOR="#ffffff" DIR="LTR">
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<H1 ALIGN=CENTER>Magick::Exception Classes</H1>
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<P><I>Exception</I> represents the base class of objects thrown when
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Magick++reports an error. Magick++ throws C++ exceptions synchronous
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with the operation where the error occurred. This allows errors to be
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trapped within the enclosing code (perhaps the code to process a
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single image) while allowing the code to be written with a simple
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coding style.</P>
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<P>A try/catch block should be placed around any sequence of
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operations which can be considered an important body of work. For
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example, if your program processes lists of images and some of these
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images may be defective, by placing the try/catch block around the
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entire sequence of code that processes one image (including
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instantiating the image object), you can minimize the overhead of
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error checking while ensuring that all objects created to deal with
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that object are safely destroyed (C++ exceptions unroll the stack
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until the enclosing try block, destroying any created objects).
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</P>
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<P>The pseudo code for the main loop of your program may look like:
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</P>
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<PRE><FONT COLOR="#000066"><FONT SIZE=2>for infile in list</FONT></FONT>
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<FONT COLOR="#000066"><FONT SIZE=2>{</FONT></FONT>
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<FONT COLOR="#000066"> <FONT SIZE=2>try {</FONT></FONT>
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<FONT COLOR="#000066"> <FONT SIZE=2>// Construct an image instance first so that we don't have to worry</FONT></FONT>
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<FONT COLOR="#000066"> <FONT SIZE=2>// about object construction failure due to a minor warning exception</FONT></FONT>
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<FONT COLOR="#000066"> <FONT SIZE=2>// being thrown.</FONT></FONT>
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<FONT COLOR="#000066"> <FONT SIZE=2>Magick::Image image; </FONT></FONT>
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<FONT COLOR="#000066"> <FONT SIZE=2>try {</FONT></FONT>
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<FONT COLOR="#000066"> <FONT SIZE=2>// Try reading image file</FONT></FONT>
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<FONT COLOR="#000066"> <FONT SIZE=2>image.read(infile);</FONT></FONT>
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<FONT COLOR="#000066"> <FONT SIZE=2>}</FONT></FONT>
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<FONT COLOR="#000066"> <FONT SIZE=2>catch( Magick::WarningCoder &warning )</FONT></FONT>
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<FONT COLOR="#000066"> <FONT SIZE=2>{</FONT></FONT>
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<FONT COLOR="#000066"> <FONT SIZE=2>// Process coder warning while loading file (e.g. TIFF warning)</FONT></FONT>
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<FONT COLOR="#000066"> <FONT SIZE=2>// Maybe the user will be interested in these warnings (or not).</FONT></FONT>
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<FONT COLOR="#000066"> <FONT SIZE=2>// If a warning is produced while loading an image, the image</FONT></FONT>
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<FONT COLOR="#000066"> <FONT SIZE=2>// can normally still be used (but not if the warning was about</FONT></FONT>
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<FONT COLOR="#000066"> <FONT SIZE=2>// something important!)</FONT></FONT>
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<FONT COLOR="#000066"> <FONT SIZE=2>cerr << “Coder Warning: “ << warning.what() << endl;</FONT></FONT>
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<FONT COLOR="#000066"> <FONT SIZE=2>}</FONT></FONT>
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<FONT COLOR="#000066"> <FONT SIZE=2>catch( Magick::Warning &warning )</FONT></FONT>
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<FONT COLOR="#000066"> <FONT SIZE=2>{</FONT></FONT>
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<FONT COLOR="#000066"> <FONT SIZE=2>// Handle any other Magick++ warning.</FONT></FONT>
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<FONT COLOR="#000066"> <FONT SIZE=2>cerr << “Warning: “ << warning.what() << endl;</FONT></FONT>
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<FONT COLOR="#000066"> <FONT SIZE=2>}</FONT></FONT>
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<FONT COLOR="#000066"> <FONT SIZE=2>catch( Magick::BlobError &error ) </FONT></FONT>
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<FONT COLOR="#000066"> <FONT SIZE=2>{ </FONT></FONT>
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<FONT COLOR="#000066"> <FONT SIZE=2>// Process Magick++ file open error</FONT></FONT>
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<FONT COLOR="#000066"> <FONT SIZE=2>cerr << “Error: “ << error.what() << endl;</FONT></FONT>
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<FONT COLOR="#000066"> <FONT SIZE=2>continue; // Try next image.</FONT></FONT>
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<FONT COLOR="#000066"> <FONT SIZE=2>}</FONT></FONT>
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<FONT COLOR="#000066"> <FONT SIZE=2>try {</FONT></FONT>
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<FONT SIZE=2><FONT COLOR="#000066">image.rotate(90);</FONT></FONT>
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<FONT SIZE=2><FONT COLOR="#000066">image.write(“outfile”);</FONT></FONT>
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<FONT COLOR="#000066"> <FONT SIZE=2>}</FONT></FONT>
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<FONT COLOR="#000066"> <FONT SIZE=2>catch ( Magick::Exception & error)</FONT></FONT>
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<FONT COLOR="#000066"> <FONT SIZE=2>{</FONT></FONT>
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<FONT COLOR="#000066"> <FONT SIZE=2>// Handle problem while rotating or writing outfile.</FONT></FONT>
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<FONT COLOR="#000066"> <FONT SIZE=2>cerr << “Caught Magick++ exception: “ << error.what() << endl;</FONT></FONT>
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<FONT COLOR="#000066"> <FONT SIZE=2>}</FONT></FONT>
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<FONT COLOR="#000066"> <FONT SIZE=2>}</FONT></FONT>
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<FONT COLOR="#000066"> <FONT SIZE=2>catch( std::exception &error )</FONT> </FONT>
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<FONT SIZE=2><FONT COLOR="#000066">{</FONT> </FONT>
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<FONT SIZE=2>// P<FONT COLOR="#000066">rocess any other exceptions derived from standard C++ exception</FONT></FONT>
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<FONT COLOR="#000066"> <FONT SIZE=2>err << “Caught C++ STD exception: “ << error.what() << endl;</FONT></FONT>
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<FONT COLOR="#000066"> <FONT SIZE=2>}</FONT> </FONT>
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<FONT SIZE=2><FONT COLOR="#000066">catch( ... )</FONT> </FONT>
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<FONT SIZE=2><FONT COLOR="#000066">{</FONT> </FONT>
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<FONT SIZE=2>// P<FONT COLOR="#000066">rocess *any* exception (last-ditch effort). There is not a lot</FONT></FONT>
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<FONT COLOR="#000066"> <FONT SIZE=2>// you can do here other to retry the operation that failed, or exit</FONT></FONT>
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<FONT COLOR="#000066"> <FONT SIZE=2>// the program. </FONT></FONT>
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<FONT SIZE=2><FONT COLOR="#000066">}</FONT></FONT>
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<FONT COLOR="#000066"><FONT SIZE=2>}</FONT></FONT></PRE><P>
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The desired location and number of try/catch blocks in your program
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depends how sophisticated its error handling must be. Very simple
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programs may use just one try/catch block.</P>
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<P>The <I>Exception</I> class is derived from the C++ standard
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exception class. This means that it contains a C++ string containing
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additional information about the error (e.g to display to the user).
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Obtain access to this string via the what() method. For
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example:
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</P>
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<P><TT><FONT COLOR="#000066"> catch( Exception &error_ )</FONT></TT>
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<BR><TT><FONT COLOR="#000066"> {</FONT></TT> <BR><TT><FONT COLOR="#000066">
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cout << "Caught exception: " << error_.what()
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<< endl;</FONT></TT> <BR><TT><FONT COLOR="#000066">
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}</FONT></TT>
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</P>
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<P>The classes <I>Warning</I> and <I>Error</I> derive from the
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<I>Exception</I> class. Exceptions derived from <I>Warning</I> are
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thrown to represent non-fatal errors which may effect the
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completeness or quality of the result (e.g. one image provided as an
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argument to montage is defective). In most cases, a <I>Warning</I>
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exception may be ignored by catching it immediately, processing it
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(e.g. printing a diagnostic) and continuing on. Exceptions derived
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from <I>Error</I> are thrown to represent fatal errors that can not
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produce a valid result (e.g. attempting to read a file which does not
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exist).
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</P>
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<P STYLE="margin-bottom: 0in">The specific derived exception classes
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are shown in the following tables:
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</P>
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<P ALIGN=CENTER STYLE="margin-bottom: 0in"><B>Warning Sub-Classes</B></P>
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<TABLE WIDTH=100% BORDER=1 CELLPADDING=2 CELLSPACING=3>
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<COL WIDTH=70*>
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<COL WIDTH=186*>
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<TR>
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<TD WIDTH=27%>
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<P ALIGN=CENTER><FONT SIZE=2><B>Warning</B></FONT></P>
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</TD>
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<TD WIDTH=73%>
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<P ALIGN=CENTER><FONT SIZE=2><B>Warning Description</B></FONT></P>
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</TD>
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</TR>
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<TR>
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<TD WIDTH=27%>
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<P ALIGN=CENTER><FONT SIZE=2>WarningUndefined</FONT></P>
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</TD>
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<TD WIDTH=73%>
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<P><FONT SIZE=2>Unspecified warning type.</FONT></P>
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</TD>
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</TR>
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<TR>
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<TD WIDTH=27%>
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<P ALIGN=CENTER><FONT SIZE=2>WarningBlob</FONT></P>
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</TD>
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<TD WIDTH=73%>
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<P STYLE="font-weight: medium; text-decoration: none"><FONT SIZE=2>NOT
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CURRENTLY USED</FONT></P>
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</TD>
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</TR>
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<TR>
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<TD WIDTH=27%>
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<P ALIGN=CENTER><FONT SIZE=2>WarningCache</FONT></P>
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</TD>
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<TD WIDTH=73%>
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<P STYLE="font-weight: medium; text-decoration: none"><FONT SIZE=2>NOT
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CURRENTLY USED</FONT></P>
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</TD>
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</TR>
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<TR>
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<TD WIDTH=27%>
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<P ALIGN=CENTER><FONT SIZE=2>WarningCoder</FONT></P>
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</TD>
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<TD WIDTH=73%>
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<P><FONT SIZE=2>Warnings issued by some coders.</FONT></P>
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</TD>
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</TR>
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<TR>
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<TD WIDTH=27%>
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<P ALIGN=CENTER><FONT SIZE=2>WarningConfigure</FONT></P>
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</TD>
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<TD WIDTH=73%>
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<P STYLE="font-weight: medium; text-decoration: none"><FONT SIZE=2>NOT
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CURRENTLY USED</FONT></P>
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</TD>
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</TR>
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<TR>
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<TD WIDTH=27%>
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<P ALIGN=CENTER><FONT SIZE=2>WarningCorruptImage</FONT></P>
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</TD>
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<TD WIDTH=73%>
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<P><FONT SIZE=2>Warning issued when an image is determined to be
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corrupt.</FONT></P>
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</TD>
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</TR>
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<TR>
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<TD WIDTH=27%>
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<P ALIGN=CENTER><FONT SIZE=2>WarningDelegate</FONT></P>
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</TD>
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<TD WIDTH=73%>
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<P><FONT SIZE=2>Warnings reported by the delegate (interface to
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external programs) subsystem.</FONT></P>
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</TD>
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</TR>
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<TR>
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<TD WIDTH=27%>
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<P ALIGN=CENTER><FONT SIZE=2>WarningDraw</FONT></P>
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</TD>
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<TD WIDTH=73%>
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<P><FONT SIZE=2>Warnings reported by the rendering subsystem.</FONT></P>
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</TD>
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</TR>
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<TR>
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<TD WIDTH=27%>
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<P ALIGN=CENTER><FONT SIZE=2>WarningFileOpen</FONT></P>
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</TD>
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<TD WIDTH=73%>
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<P><FONT SIZE=2>Warning reported when The image file could not be
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opened (permission problem, wrong file type, or does not exist).</FONT></P>
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</TD>
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</TR>
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<TR>
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<TD WIDTH=27%>
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<P ALIGN=CENTER><FONT SIZE=2>WarningImage</FONT></P>
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</TD>
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<TD WIDTH=73%>
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<P STYLE="font-weight: medium"><FONT SIZE=2>NOT CURRENTLY USED</FONT></P>
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</TD>
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</TR>
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<TR>
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<TD WIDTH=27%>
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<P ALIGN=CENTER><FONT SIZE=2>WarningMissingDelegate</FONT></P>
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</TD>
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<TD WIDTH=73%>
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<P STYLE="font-weight: medium"><FONT SIZE=2>NOT CURRENTLY USED</FONT></P>
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</TD>
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</TR>
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<TR>
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<TD WIDTH=27%>
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<P ALIGN=CENTER><FONT SIZE=2>WarningModule</FONT></P>
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</TD>
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<TD WIDTH=73%>
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<P STYLE="font-weight: medium"><FONT SIZE=2>NOT CURRENTLY USED</FONT></P>
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</TD>
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</TR>
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<TR>
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<TD WIDTH=27%>
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<P ALIGN=CENTER><FONT SIZE=2>WarningMonitor</FONT></P>
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</TD>
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<TD WIDTH=73%>
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<P STYLE="font-weight: medium"><FONT SIZE=2>NOT CURRENTLY USED</FONT></P>
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</TD>
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</TR>
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<TR>
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<TD WIDTH=27%>
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<P ALIGN=CENTER><FONT SIZE=2>WarningOption</FONT></P>
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</TD>
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<TD WIDTH=73%>
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<P><FONT SIZE=2>Warning reported when an option is malformed or
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out of range.</FONT></P>
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</TD>
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</TR>
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<TR>
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<TD WIDTH=27%>
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<P ALIGN=CENTER><FONT SIZE=2>WarningRegistry</FONT></P>
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</TD>
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<TD WIDTH=73%>
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<P STYLE="font-weight: medium"><FONT SIZE=2>NOT CURRENTLY USED</FONT></P>
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</TD>
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</TR>
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<TR>
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<TD WIDTH=27%>
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<P ALIGN=CENTER><FONT SIZE=2>WarningResourceLimit</FONT></P>
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</TD>
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<TD WIDTH=73%>
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<P><FONT SIZE=2>Warning reported when a program resource is
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exhausted (e.g. not enough memory).</FONT></P>
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</TD>
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</TR>
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<TR>
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<TD WIDTH=27%>
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<P ALIGN=CENTER><FONT SIZE=2>WarningStream</FONT></P>
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</TD>
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<TD WIDTH=73%>
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<P STYLE="font-weight: medium"><FONT SIZE=2>NOT CURRENTLY USED</FONT></P>
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</TD>
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</TR>
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<TR>
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<TD WIDTH=27%>
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<P ALIGN=CENTER><FONT SIZE=2>WarningType</FONT></P>
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</TD>
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<TD WIDTH=73%>
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<P STYLE="font-weight: medium"><FONT SIZE=2>NOT CURRENTLY USED</FONT></P>
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</TD>
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</TR>
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<TR>
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<TD WIDTH=27%>
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<P ALIGN=CENTER><FONT SIZE=2>WarningXServer</FONT></P>
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</TD>
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<TD WIDTH=73%>
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<P><FONT SIZE=2>Warnings reported by the X11 subsystem.</FONT></P>
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</TD>
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</TR>
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</TABLE>
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<P STYLE="margin-bottom: 0in"><BR>
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</P>
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<P ALIGN=CENTER STYLE="margin-bottom: 0in"><B>Error Sub-Classes</B></P>
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<TABLE WIDTH=100% BORDER=1 CELLPADDING=2 CELLSPACING=3>
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<COL WIDTH=71*>
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<COL WIDTH=185*>
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<TR>
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<TD WIDTH=28%>
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<P ALIGN=CENTER><FONT SIZE=2><B>Error</B></FONT></P>
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</TD>
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<TD WIDTH=72%>
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<P ALIGN=CENTER><FONT SIZE=2><B>Error Description</B></FONT></P>
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</TD>
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</TR>
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<TR>
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<TD WIDTH=28%>
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<P ALIGN=CENTER><FONT SIZE=2>ErrorUndefined</FONT></P>
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</TD>
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<TD WIDTH=72%>
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<P><FONT SIZE=2>Unspecified error type.</FONT></P>
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</TD>
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</TR>
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<TR>
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<TD WIDTH=28%>
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<P ALIGN=CENTER><FONT SIZE=2>ErrorBlob</FONT></P>
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</TD>
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<TD WIDTH=72%>
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<P><FONT SIZE=2>Error reported by BLOB I/O subsystem.</FONT></P>
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</TD>
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</TR>
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<TR>
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<TD WIDTH=28%>
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<P ALIGN=CENTER><FONT SIZE=2>ErrorCache</FONT></P>
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</TD>
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<TD WIDTH=72%>
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<P><FONT SIZE=2>Error reported by the pixel cache subsystem.</FONT></P>
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</TD>
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</TR>
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<TR>
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<TD WIDTH=28%>
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<P ALIGN=CENTER><FONT SIZE=2>ErrorCoder</FONT></P>
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</TD>
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<TD WIDTH=72%>
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<P><FONT SIZE=2>Error reported by coders (image format support).</FONT></P>
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</TD>
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</TR>
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<TR>
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<TD WIDTH=28%>
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<P ALIGN=CENTER><FONT SIZE=2>ErrorConfigure</FONT></P>
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</TD>
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<TD WIDTH=72%>
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<P><FONT SIZE=2>Errors reported while loading configuration files.</FONT></P>
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</TD>
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</TR>
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<TR>
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<TD WIDTH=28%>
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<P ALIGN=CENTER><FONT SIZE=2>ErrorCorruptImage</FONT></P>
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</TD>
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<TD WIDTH=72%>
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<P><FONT SIZE=2>Error reported when the image file is corrupt.</FONT></P>
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</TD>
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</TR>
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<TR>
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<TD WIDTH=28%>
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<P ALIGN=CENTER><FONT SIZE=2>ErrorDelegate</FONT></P>
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</TD>
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<TD WIDTH=72%>
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<P><FONT SIZE=2>Errors reported by the delegate (interface to
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external programs) subsystem.</FONT></P>
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</TD>
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</TR>
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<TR>
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<TD WIDTH=28%>
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<P ALIGN=CENTER><FONT SIZE=2>ErrorDraw</FONT></P>
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</TD>
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<TD WIDTH=72%>
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<P><FONT SIZE=2>Error reported while drawing on image.</FONT></P>
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</TD>
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</TR>
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<TR>
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<TD WIDTH=28%>
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<P ALIGN=CENTER><FONT SIZE=2>ErrorFileOpen</FONT></P>
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</TD>
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<TD WIDTH=72%>
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<P><FONT SIZE=2>Error reported when the image file can not be
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opened.</FONT></P>
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</TD>
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</TR>
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<TR>
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<TD WIDTH=28%>
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<P ALIGN=CENTER><FONT SIZE=2>ErrorImage</FONT></P>
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</TD>
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<TD WIDTH=72%>
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<P><FONT SIZE=2>Errors reported while drawing.</FONT></P>
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</TD>
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</TR>
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<TR>
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<TD WIDTH=28%>
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<P ALIGN=CENTER><FONT SIZE=2>ErrorMissingDelegate</FONT></P>
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</TD>
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<TD WIDTH=72%>
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<P><FONT SIZE=2>Error reported when an add-on library or program
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is necessary in order to support the requested operation.</FONT></P>
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</TD>
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</TR>
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<TR>
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<TD WIDTH=28%>
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<P ALIGN=CENTER><FONT SIZE=2>ErrorModule</FONT></P>
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</TD>
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<TD WIDTH=72%>
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<P><FONT SIZE=2>Errors reported by the module loader subsystem.</FONT></P>
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</TD>
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</TR>
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<TR>
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<TD WIDTH=28%>
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<P ALIGN=CENTER><FONT SIZE=2>ErrorMonitor</FONT></P>
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</TD>
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<TD WIDTH=72%>
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<P STYLE="font-weight: medium"><FONT SIZE=2>NOT CURRENTLY USED</FONT></P>
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</TD>
|
|
</TR>
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|
<TR>
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|
<TD WIDTH=28%>
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<P ALIGN=CENTER><FONT SIZE=2>ErrorOption</FONT></P>
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|
</TD>
|
|
<TD WIDTH=72%>
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|
<P><FONT SIZE=2>Error reported when an option is malformed or out
|
|
of range.</FONT></P>
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|
</TD>
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|
</TR>
|
|
<TR>
|
|
<TD WIDTH=28%>
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|
<P ALIGN=CENTER><FONT SIZE=2>ErrorRegistry</FONT></P>
|
|
</TD>
|
|
<TD WIDTH=72%>
|
|
<P><FONT SIZE=2>Errors reported by the image/BLOB registry
|
|
subsystem.</FONT></P>
|
|
</TD>
|
|
</TR>
|
|
<TR>
|
|
<TD WIDTH=28%>
|
|
<P ALIGN=CENTER><FONT SIZE=2>ErrorResourceLimit</FONT></P>
|
|
</TD>
|
|
<TD WIDTH=72%>
|
|
<P><FONT SIZE=2>Error reported when a program resource is
|
|
exhausted (e.g. not enough memory).</FONT></P>
|
|
</TD>
|
|
</TR>
|
|
<TR>
|
|
<TD WIDTH=28%>
|
|
<P ALIGN=CENTER><FONT SIZE=2>ErrorStream</FONT></P>
|
|
</TD>
|
|
<TD WIDTH=72%>
|
|
<P><FONT SIZE=2>Errors reported by the pixel stream subsystem.</FONT></P>
|
|
</TD>
|
|
</TR>
|
|
<TR>
|
|
<TD WIDTH=28%>
|
|
<P ALIGN=CENTER><FONT SIZE=2>ErrorType</FONT></P>
|
|
</TD>
|
|
<TD WIDTH=72%>
|
|
<P><FONT SIZE=2>Errors reported by the type (font) rendering
|
|
subsystem.</FONT></P>
|
|
</TD>
|
|
</TR>
|
|
<TR>
|
|
<TD WIDTH=28%>
|
|
<P ALIGN=CENTER><FONT SIZE=2>ErrorXServer</FONT></P>
|
|
</TD>
|
|
<TD WIDTH=72%>
|
|
<P><FONT SIZE=2>Errors reported by the X11 subsystem.</FONT></P>
|
|
</TD>
|
|
</TR>
|
|
</TABLE>
|
|
<P><BR><BR>
|
|
</P>
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</BODY>
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</HTML>
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