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XNextEvent(3X11)	  XLIB FUNCTIONS	 XNextEvent(3X11)

NAME
       XNextEvent, XPeekEvent, XWindowEvent, XCheckWindowEvent,
       XMaskEvent, XCheckMaskEvent, XCheckTypedEvent, XCheckType-
       dWindowEvent - select events by type

SYNTAX
       XNextEvent(display, event_return)
	     Display *display;
	     XEvent *event_return;

       XPeekEvent(display, event_return)
	     Display *display;
	     XEvent *event_return;

       XWindowEvent(display, w, event_mask, event_return)
	     Display *display;
	     Window w;
	     long event_mask;
	     XEvent *event_return;

       Bool XCheckWindowEvent(display, w, event_mask,
       event_return)
	     Display *display;
	     Window w;
	     long event_mask;
	     XEvent *event_return;

       XMaskEvent(display, event_mask, event_return)
	     Display *display;
	     long event_mask;
	     XEvent *event_return;

       Bool XCheckMaskEvent(display, event_mask, event_return)
	     Display *display;
	     long event_mask;
	     XEvent *event_return;

       Bool XCheckTypedEvent(display, event_type, event_return)
	     Display *display;
	     int event_type;
	     XEvent *event_return;

       Bool XCheckTypedWindowEvent(display, w, event_type,
       event_return)
	     Display *display;
	     Window w;
	     int event_type;
	     XEvent *event_return;

ARGUMENTS
       display	Specifies the connection to the X server.

       event_mask
		 Specifies the event mask.

X Version 11		Release 6.4				1

XNextEvent(3X11)	  XLIB FUNCTIONS	 XNextEvent(3X11)

       event_return
		 Returns the matched event's associated struc-
		 ture.

       event_return
		 Returns the next event in the queue.

       event_return
		 Returns a copy of the matched event's associated
		 structure.

       event_type
		 Specifies the event type to be compared.

       w	 Specifies the window  whose event uou are inter-
		 ested in.

DESCRIPTION
       The XNextEvent function copies the first event from the
       event queue into the specified XEvent structure and then
       removes it from the queue.  If the event queue is empty,
       XNextEvent flushes the output buffer and blocks until an
       event is received.

       The XPeekEvent function returns the first event from the
       event queue, but it does not remove the event from the
       queue.  If the queue is empty, XPeekEvent flushes the out-
       put buffer and blocks until an event is received.  It then
       copies the event into the client-supplied XEvent structure
       without removing it from the event queue.

       The XWindowEvent function searches the event queue for an
       event that matches both the specified window and event
       mask.  When it finds a match, XWindowEvent removes that
       event from the queue and copies it into the specified
       XEvent structure.  The other events stored in the queue
       are not discarded.  If a matching event is not in the
       queue, XWindowEvent flushes the output buffer and blocks
       until one is received.

       The XCheckWindowEvent function searches the event queue
       and then the events available on the server connection for
       the first event that matches the specified window and
       event mask.  If it finds a match, XCheckWindowEvent
       removes that event, copies it into the specified XEvent
       structure, and returns True.  The other events stored in
       the queue are not discarded.  If the event you requested
       is not available, XCheckWindowEvent returns False, and the
       output buffer will have been flushed.

       The XMaskEvent function searches the event queue for the
       events associated with the specified mask.  When it finds
       a match, XMaskEvent removes that event and copies it into

X Version 11		Release 6.4				2

XNextEvent(3X11)	  XLIB FUNCTIONS	 XNextEvent(3X11)

       the specified XEvent structure.	The other events stored
       in the queue are not discarded.	If the event you
       requested is not in the queue, XMaskEvent flushes the out-
       put buffer and blocks until one is received.

       The XCheckMaskEvent function searches the event queue and
       then any events available on the server connection for the
       first event that matches the specified mask.  If it finds
       a match, XCheckMaskEvent removes that event, copies it
       into the specified XEvent structure, and returns True.
       The other events stored in the queue are not discarded.
       If the event you requested is not available, XCheck-
       MaskEvent returns False, and the output buffer will have
       been flushed.

       The XCheckTypedEvent function searches the event queue and
       then any events available on the server connection for the
       first event that matches the specified type.  If it finds
       a match, XCheckTypedEvent removes that event, copies it
       into the specified XEvent structure, and returns True.
       The other events in the queue are not discarded. If the
       event is not available, XCheckTypedEvent returns False,
       and the output buffer will have been flushed.

       The XCheckTypedWindowEvent function searches the event
       queue and then any events available on the server connec-
       tion for the first event that matches the specified type
       and window.  If it finds a match, XCheckTypedWindowEvent
       removes the event from the queue, copies it into the spec-
       ified XEvent structure, and returns True.  The other
       events in the queue are not discarded.  If the event is
       not available, XCheckTypedWindowEvent returns False, and
       the output buffer will have been flushed.

SEE ALSO
       XAnyEvent(3X11), XIfEvent(3X11), XPutBackEvent(3X11),
       XSendEvent(3X11)
       Xlib - C Language X Interface

X Version 11		Release 6.4				3

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