<!-- =defdoc xpachanges xpachanges 1 --> <HTML> <HEAD> <TITLE>Changes For Users from XPA 1.0 and 2.0</TITLE> </HEAD> <BODY> <!-- =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> </BODY> </HTML>
