xpacmdnew(3)							SAORD Documentation						      xpacmdnew(3)

NAME

       XPACmdNew -  create a new XPA public access point for commands

SYNOPSIS

	 #include <xpa.h>

	 XPA XPACmdNew(char *class, char *name);

DESCRIPTION

       Create a new XPA public access point for commands that will share a common identifier class:name. Enter this access point into the XPA name
       server, so that it can be accessed by external processes.  XPACmdNew() returns an XPA struct.

       It often is more convenient to have one public access point that can manage a number of commands, rather than having individual access
       points for each command. For example, it is easier to command the ds9 image display using:

	 echo "colormap I8"   | xpaset ds9
	 echo "scale log"     | xpaset ds9
	 echo "file foo.fits" | xpaset ds9

       then to use:

	 echo "I8"	 | xpaset ds9_colormap
	 echo "log"	 | xpaset ds9_scale
	 echo "foo.fits" | xpaset ds9_file

       In the first case, the commands remain the same regardless of the target XPA name.  In the second case, the command names must change for
       each instance of ds9.  That is, if a second instance of ds9 called DS9 were running, it would be commanded either as:

	 echo "colormap I8"   | xpaset DS9
	 echo "scale log"     | xpaset DS9
	 echo "file foo.fits" | xpaset DS9

       or as:

	 echo "I8"	 | xpaset DS9_colormap
	 echo "log"	 | xpaset DS9_scale
	 echo "foo.fits" | xpaset DS9_file

       Thus, in cases where a program is going to manage many commands, it generally is easier to define them as commands associated with the
       XPACmdNew() routine, rather than as separate access points using XPANew().

       When XPACmdNew() is called, only the class:name identifier is specified.  Each sub-command is subsequently defined using the XPACmdAdd()
       routine.

SEE ALSO

       See xpa(7) for a list of XPA help pages

version 2.1.14							   June 7, 2012 						      xpacmdnew(3)