=pod

=head1 NAME



B<XPAClient: The XPA Client-side Programming Interface>



=head1 SYNOPSIS




A description of the XPA client-side programming interface.



=head1 DESCRIPTION



B<Introduction to XPA Client Programming>

Sending/receiving data to/from an XPA access point is easy: you
generally only need to call the XPAGet() or XPASet() subroutines.

  #include <xpa.h>

  int XPAGet(XPA xpa,
      char *template, char *paramlist, char *mode,
      char **bufs, size_t *lens, char **names, char **messages, int n);

  int XPASet(XPA xpa,
      char *template, char *paramlist, char *mode,
      char *buf, size_t len, char **names, char **messages, int n);

  int XPAInfo(XPA xpa,
      char *template, char *paramlist, char *mode,
      char **names, char **messages, int n);

  int XPAAccess(XPA xpa,
      char *template, char *paramlist, char *mode,
      char **names, char **messages, int n);

  int XPAGetFd(XPA xpa,
      char *template, char *paramlist, char *mode,
      int *fds, char **names, char **messages, int n);

  int XPASetFd(XPA xpa,
      char *template, char *paramlist, char *mode,
      int fd, char **names, char **messages, int n);

  XPA XPAOpen(char *mode);

  void XPAClose(XPA xpa);

  int XPANSLookup(XPA xpa,
      char *template, char *type,
      char ***classes, char ***names, char ***methods, char ***infos);


B<Introduction>

To use the XPA application programming interface, a software developer
generally will include the xpa.h definitions file:

  #include <xpa.h>

in the software module that defines or accesses an XPA access point and
then will link against the libxpa.a library:

  gcc -o foo foo.c libxpa.a

XPA has been compiled using both C and C++ compilers.

Client communication with XPA public access points generally is
accomplished using XPAGet() or XPASet() within a program (or xpaget
and xpaset at the command line).  Both routines require specification
of the name of the access point.  If a template
is used to specify the access point name (e.g., "ds9*"), then
communication will take place with all servers matching that template.




=head1 SEE ALSO



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


=cut