XNextEvent(3X11)                     SysV                     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;

     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 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.

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