x11r4 man page for xpqueryextension

XpQueryExtension(3Xp)						 XPRINT FUNCTIONS					     XpQueryExtension(3Xp)

NAME
       XpQueryExtension  - Queries an X Server to determine if it supports the X Print Service Extension, and if it does, what the offsets are for
       associated events and errors.

SYNOPSIS
	     cc [ flag... ] file... -lXp [ library... ]
	     #include <X11/extensions/Print.h>

       Bool XpQueryExtension ( display, event_base_return error_base_return )
	     Display *display;
	     int *event_base_return;
	     int *error_base_return;

ARGUMENTS
       display
	      Specifies a pointer to the Display structure; returned from XOpenDisplay.

       event_base_return
	      The base value for X Print Service Extension events

       error_base_return
	      The base value for X Print Service Extension errors.

DESCRIPTION
       XpQueryExtension determines if the X Print Service Extension is present. It returns True if the extension is supported, otherwise False. If
       the extension is present, the base values for events and errors are returned, and can be used to decode incoming event and error values.

       The  X  Print Service Extension is initialized on the first call to any X Print Service function; there is no need to explicitly initialize
       the X Print Service Extension.

X Version 11							    libXp 1.0.0 					     XpQueryExtension(3Xp)