XQueryExtension(3X11X Version 11 (Release 6.XQueryExtension(3X11)
NAME
XQueryExtension - determines availability of an extension
SYNTAX
Bool XQueryExtension(display, name, major_opcode_return,
first_event_return, first_error_return)
Display *display;
char *name;
int *major_opcode_return;
int *first_event_return;
int *first_error_return;
ARGUMENTS
display Specifies the connection to the X server.
name Specifies the extension name.
major_opcode_return
Returns the major opcode.
first_event_return
Returns the first event code, if any.
Specifies the extension list.
DESCRIPTION
The XQueryExtension function determines if the named
extension is present. If the extension is not present,
XQueryExtension returns False; otherwise, it returns True.
If the extension is present, XQueryExtension returns the
major opcode for the extension to major_opcode_return;
otherwise, it returns zero. Any minor opcode and the request
formats are specific to the extension. If the extension
involves additional event types, XQueryExtension returns the
base event type code to first_event_return; otherwise, it
returns zero. The format of the events is specific to the
extension. If the extension involves additional error codes,
XQueryExtension returns the base error code to
first_error_return; otherwise, it returns zero. The format
of additional data in the errors is specific to the
extension.
SEE ALSO
XFreeExtensionList(), XListExtensions(), "Basic Protocol
Support Routines".
Xlib - C Language X Interface
Page 1 (printed 7/20/06)
