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.\" ========================================================================
.\"
.IX Title "xpacmdnew 3"
.TH xpacmdnew 3 "July 23, 2013" "version 2.1.15" "SAORD Documentation"
.\" For nroff, turn off justification. Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
\&\fBXPACmdNew: create a new \s-1XPA\s0 public access point for commands\fR
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <xpa.h>
\&
\& XPA XPACmdNew(char *class, char *name);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
Create a new \s-1XPA\s0 public access point for commands that will share a
common identifier class:name. Enter this access point into the \s-1XPA\s0
name server, so that it can be accessed by external processes.
\&\fIXPACmdNew()\fR returns an \s-1XPA\s0 struct.
.PP
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:
.PP
.Vb 3
\& echo "colormap I8" | xpaset ds9
\& echo "scale log" | xpaset ds9
\& echo "file foo.fits" | xpaset ds9
.Ve
.PP
then to use:
.PP
.Vb 3
\& echo "I8" | xpaset ds9_colormap
\& echo "log" | xpaset ds9_scale
\& echo "foo.fits" | xpaset ds9_file
.Ve
.PP
In the first case, the commands remain the same regardless of the
target \s-1XPA\s0 name. In the second case, the command names must change
for each instance of ds9. That is, if a second instance of ds9
called \s-1DS9\s0 were running, it would be commanded either as:
.PP
.Vb 3
\& echo "colormap I8" | xpaset DS9
\& echo "scale log" | xpaset DS9
\& echo "file foo.fits" | xpaset DS9
.Ve
.PP
or as:
.PP
.Vb 3
\& echo "I8" | xpaset DS9_colormap
\& echo "log" | xpaset DS9_scale
\& echo "foo.fits" | xpaset DS9_file
.Ve
.PP
Thus, in cases where a program is going to manage many commands, it
generally is easier to define them as commands associated with the
\&\fIXPACmdNew()\fR routine, rather than as separate access points using
\&\fIXPANew()\fR.
.PP
When \fIXPACmdNew()\fR is called, only the class:name identifier is
specified. Each sub-command is subsequently defined using the
\&\fIXPACmdAdd()\fR routine.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
See xpa(n) for a list of \s-1XPA\s0 help pages
|
