XNextEvent(3X11)XNextEvent(3X11)NAME
XNextEvent, XPeekEvent, XWindowEvent, XCheckWindowEvent, XMaskEvent,
XCheckMaskEvent, XCheckTypedEvent, XCheckTypedWindowEvent - select
events by type
SYNOPSIS
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
Specifies the connection to the X server. Specifies the event mask.
Returns the matched event's associated structure. Returns the next
event in the queue. Returns a copy of the matched event's associated
structure. Specifies the event type to be compared. Specifies the
window whose event you 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, XWin‐
dowEvent 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 associ‐
ated 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, XCheckType‐
dWindowEvent 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, XCheckTypedWindow‐
Event returns False, and the output buffer will have been flushed.
SEE ALSOXAnyEvent(3X11), XIfEvent(3X11), XPutBackEvent(3X11), XSendEvent(3X11)
Xlib -- C Language X Interface
XNextEvent(3X11)
