XNextEvent(3X11)    X Version 11 (Release 4)     XNextEvent(3X11)



  NAME
       XNextEvent, XPeekEvent, XWindowEvent, XCheckWindowEvent,
       XMaskEvent, XCheckMaskEvent, XCheckTypedEvent,
       XCheckTypedWindowEvent - 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;


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       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.

       event_return
                 Returns the matched event's associated structure.

       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
                 interested 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 output


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       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 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 output 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, XCheckMaskEvent returns
       False, and the output buffer will have been flushed.




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       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 connection 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 specified 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



















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