XNextEvent 3X11 __xorgversion__ XLIB FUNCTIONS XNextEvent XPeekEvent XWindowEvent XCheckWindowEvent XMaskEvent XCheckMaskEvent XCheckTypedEvent XCheckTypedWindowEvent select events by type int XNextEvent ( Display *display , XEvent *event_return ); int XPeekEvent ( Display *display , XEvent *event_return ); int XWindowEvent ( Display *display , Window w , long event_mask , XEvent *event_return ); Bool XCheckWindowEvent ( Display *display , Window w , long event_mask , XEvent *event_return ); int XMaskEvent ( Display *display , long event_mask , XEvent *event_return ); Bool XCheckMaskEvent ( Display *display , long event_mask , XEvent *event_return ); Bool XCheckTypedEvent ( Display *display , int event_type , XEvent *event_return ); Bool XCheckTypedWindowEvent ( Display *display , Window w , int event_type , XEvent *event_return ); 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. 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. XAnyEvent(3X11), XIfEvent(3X11), XPutBackEvent(3X11), XSendEvent(3X11) Xlib - C Language X Interface