XNextEvent(3X11)            X Version 11(Release 5)            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.





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      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.


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


























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