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X11R7.4 - man page for xkbqueryextension (x11r4 section 3)

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XkbQueryExtension(3)			  XKB FUNCTIONS 		     XkbQueryExtension(3)

NAME
       XkbQueryExtension -  Determines the compatibility of a library at runtime.

SYNOPSIS
       Bool   XkbQueryExtension   (   dpy,  opcode_rtrn,  event_rtrn,  error_rtrn,  major_in_out,
       minor_in_out )
	     Display *dpy;
	     int opcode_rtrn;
	     int event_rtrn;
	     int *error_rtrn;
	     int major_in_out;
	     int minor_in_out;

ARGUMENTS
       dpy    connection to the X server

       opcode_rtrn
	      backfilled with the major extension opcode

       event_rtrn
	      backfilled with the extension base event code

       error_rtrn
	      backfilled with the extension base error code

       major_in_out
	      compile time lib major version in, server major version out

       minor_in_out
	      compile time lib min version in, server minor version out

DESCRIPTION
       Call XkbQueryExtension to check for the presence and compatibility of the extension in the
       server  and to initialize the extension. Because of potential version mismatches, you can-
       not use the generic extension mechanism functions ( XQueryExtension and	XInitExtension	)
       for checking for the presence of, and initializing the Xkb extension.

       You  must  call	XkbQueryExtension  or  XkbOpenDisplay  before using any other Xkb library
       interfaces, unless such usage is explicitly allowed in the interface description  in  this
       document.  The  exceptions  are:  XkbIgnoreExtension,  XkbLibraryVersion, and a handful of
       audible-bell functions. You should not use any other Xkb functions if the extension is not
       present or is uninitialized. In general, calls to Xkb library functions made prior to ini-
       tializing the Xkb extension cause BadAccess protocol errors.

       XkbQueryExtension both determines whether a compatible Xkb extension is present in  the	X
       server and initializes the extension when it is present.

       The  XkbQueryExtension  function determines whether a compatible version of the X Keyboard
       Extension is present in the server. If a compatible extension is  present,  XkbQueryExten-
       sion returns True; otherwise, it returns False.

       If a compatible version of Xkb is present, XkbQueryExtension initializes the extension. It
       backfills the major opcode for the keyboard extension in opcode_rtrn, the base event  code
       in  event_rtrn, the base error code in error_rtrn, and the major and minor version numbers
       of the extension in major_in_out and minor_in_out.  The major opcode is	reported  in  the
       req_major fields of some Xkb events. For a discussion of the base event code.

RETURN VALUES
       True	      The  XkbQueryExtension  function returns True if it determines a compatible
		      version of the X Keyboard Extension is present in the server.

       False	      The XkbQueryExtension function returns False if it determines a  compatible
		      version of the X Keyboard Extension is not present in the server.

SEE ALSO
       XkbIgnoreExtension(3), XkbLibraryVersion(3), XkbOpenDisplay(3)

X Version 11				   libX11 1.2.1 		     XkbQueryExtension(3)
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