IABSD.fr/xenocara/lib/libX11/man/XGetEventData.man

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• Author : matthieu
  Date : 2010-05-18 19:37:28
  Hash : aa3c9f93
  Message : Update to libX11 1.3.3. Tested on a bulk ports build by naddy@.

• lib/libX11/man/XGetEventData.man

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  .ds xT X Toolkit Intrinsics \- C Language Interface
  .ds xW Athena X Widgets \- C Language X Toolkit Interface
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  .TH XGetEventData __libmansuffix__ __xorgversion__ "XLIB FUNCTIONS"
  .SH NAME
  XGetEventData, XFreeEventData, XGenericEventCookie \- retrieve and free additional event data through cookies.
  .SH SYNTAX
  .HP
  Bool XGetEventData\^(\^Display *\fIdisplay\fP\^, XGenericEventCookie *\fIcookie\fP\^);
  .HP
  void XFreeEventData\^(\^Display *\fIdisplay\fP\^, XGenericEventCookie *\fIcookie\fP\^);
  .HP
  .SH ARGUMENTS
  .IP \fIdisplay\fP 1i
  Specifies the connection to the X server.
  .IP \fIcookie\fP 1i
  Specifies the cookie to free or retrieve the data for.
  
  .SH STRUCTURES
  .Ds 0
  .TA .5i 3i
  .ta .5i 3i
  typedef struct {
  	int type;
  	unsigned long serial;
  	Bool send_event;
  	Display *display;
  	int extension;
  	int evtype;
  	unsigned int cookie;
  	void *data;
  } XGenericEventCookie;
  .De
  
  .SH DESCRIPTION
  Some extension
  .ZN XGenericEvents
  require additional memory to store information.
  For these events, the library returns a
  .ZN XGenericEventCookie
  with a token ('cookie') unique to this event. The
  .ZN XGenericEventCookie 's
  data pointer is undefined until
  .ZN XGetEventData
  is called.
  
  The
  .ZN XGetEventData
  function retrieves this extra data for the given cookie. No round-trip to
  the server is required. If the cookie is invalid or the
  event is not an event handled by cookie handlers,
  .ZN False
  is returned. If
  .ZN XGetEventData
  returns
  .ZN True ,
  the cookie's data pointer points to the memory containing the event
  information. A client must call
  .ZN XFreeEventData
  to free this memory.
  .ZN XGetEventData
  returns
  .ZN False
  for multiple calls for the same event cookie.
  
  The
  .ZN XFreeEventData
  function frees the data associated with a cookie. A client must call
  .ZN XFreeEventData
  for each cookie claimed with
  .ZN XGetEventData .
  
  .SH EXAMPLE CODE
  .Ds 0
  .TA .5i 3i
  .ta .5i 3i
  XEvent event;
  XGenericEventCookie *cookie = &ev;
  
  XNextEvent(display, &event);
  if (XGetEventData(display, cookie)) {
      handle_cookie_event(cookie->data);
  } else
      handle_event(&event);
  }
  XFreeEventData(display, cookie);
  .De
  
  .SH NOTES
  A cookie is defined as unclaimed if it has been returned to the client
  through
  .ZN XNextEvent
  but its data has not been retrieved via
  .ZN XGetEventData .
  Subsequent calls to
  .ZN XNextEvent
  may free memory associated with unclaimed cookies.
  Multi-threaded X clients must ensure that
  .ZN XGetEventData
  is called before the next call to
  .ZN XNextEvent .
  
  .SH "SEE ALSO"
  XNextEvent(__libmansuffix__),
  .br
  \fI\*(xL\fP