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<TITLE>Changes For Users from XPA 1.0 and 2.0</TITLE>
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<!-- =section xpachanges NAME -->
<H2><A NAME="xpachanges">XPA Changes: Changes For Users from XPA 1.0 and 2.0</A></H2>
<!-- =section xpachanges SYNOPSIS -->
<H2>Summary</H2>
<P>
This document describes changes that will affect users who migrate
from XPA 1.0 to XPA 2.0.
<!-- =section xpachanges DESCRIPTION -->
<H2>Description</H2>
<P>
There have been a few changes that affect users who upgrade XPA
from version 1.0 to version 2.0. These changes are detailed below.
<UL>
<P>
<LI>XPA commands no longer have a resolver routine (this is open to
negotiations, but we decided the idea was dumb). For the SAOtng
program, this means that you must explicitly specify the access
point, i.e.,:
<PRE>
cat foo.fits | xpaset SAOtng fits
</PRE>
<P>
instead of:
<PRE>
cat foo.fits | xpaset SAOtng
</PRE>
<P>
<LI>By default, xpaset, xpaget, etc. now wait for the server callback to
complete; i.e., the old -W is implied (and the switch is ignored).
This allows support for better error handling. If you want xpaset, etc.
to return before the callback is complete, use -n switch:
<PRE>
echo "file foo.fits" | xpaset -n SAOtng
</PRE>
<P>
<LI>The old -w switch in xpaset and xpaget is no longer necessary (and is
ignored), since you can have more than one process communicating with
an xpa access point at one time.
<P>
<LI>The new -p switch on xpaset means you need not read from stdout:
<PRE>
xpaset -p SAOtng colormap I8
</PRE>
<P>
will send the paramlist to the SAOtng callback without reading from stdin.
</UL>
<!-- =section xpachanges SEE ALSO -->
<!-- =text See xpa(n) for a list of XPA help pages -->
<!-- =stop -->
<P>
<A HREF="./help.html">Go to XPA Help Index</A>
<H5>Last updated: September 10, 2003</H5>
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