224 lines
4.8 KiB
Groff
224 lines
4.8 KiB
Groff
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.\" Copyright \(co 2009 Red Hat, Inc.
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.\"
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.\" Permission is hereby granted, free of charge, to any person obtaining a
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.\" copy of this software and associated documentation files (the "Software"),
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.\" to deal in the Software without restriction, including without limitation
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.\" the rights to use, copy, modify, merge, publish, distribute, sublicense,
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.\" and/or sell copies of the Software, and to permit persons to whom the
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.\" Software is furnished to do so, subject to the following conditions:
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.\"
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.\" The above copyright notice and this permission notice (including the next
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.\" paragraph) shall be included in all copies or substantial portions of the
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.\" Software.
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.\"
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.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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.\" IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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.\" FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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.\" THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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.\" LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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.\" FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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.\" DEALINGS IN THE SOFTWARE.
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.\"
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.ds xT X Toolkit Intrinsics \- C Language Interface
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.ds xW Athena X Widgets \- C Language X Toolkit Interface
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.ds xL Xlib \- C Language X Interface
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.ds xC Inter-Client Communication Conventions Manual
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.na
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.de Ds
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.nf
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.\\$1D \\$2 \\$1
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.ft 1
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.\".ps \\n(PS
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.\".if \\n(VS>=40 .vs \\n(VSu
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.\".if \\n(VS<=39 .vs \\n(VSp
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..
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.de De
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.ce 0
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.if \\n(BD .DF
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.nr BD 0
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.in \\n(OIu
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.if \\n(TM .ls 2
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.sp \\n(DDu
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.fi
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..
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.de FD
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.LP
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.KS
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.TA .5i 3i
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.ta .5i 3i
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.nf
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..
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.de FN
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.fi
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.KE
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.LP
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..
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.de IN \" send an index entry to the stderr
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..
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.de C{
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.KS
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.nf
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.D
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.\"
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.\" choose appropriate monospace font
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.\" the imagen conditional, 480,
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.\" may be changed to L if LB is too
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.\" heavy for your eyes...
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.\"
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.ie "\\*(.T"480" .ft L
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.el .ie "\\*(.T"300" .ft L
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.el .ie "\\*(.T"202" .ft PO
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.el .ie "\\*(.T"aps" .ft CW
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.el .ft R
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.ps \\n(PS
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.ie \\n(VS>40 .vs \\n(VSu
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.el .vs \\n(VSp
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..
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.de C}
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.DE
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.R
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..
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.de Pn
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.ie t \\$1\fB\^\\$2\^\fR\\$3
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.el \\$1\fI\^\\$2\^\fP\\$3
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..
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.de ZN
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.ie t \fB\^\\$1\^\fR\\$2
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.el \fI\^\\$1\^\fP\\$2
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..
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.de hN
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.ie t <\fB\\$1\fR>\\$2
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.el <\fI\\$1\fP>\\$2
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..
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.de NT
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.ne 7
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.ds NO Note
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.if \\n(.$>$1 .if !'\\$2'C' .ds NO \\$2
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.if \\n(.$ .if !'\\$1'C' .ds NO \\$1
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.ie n .sp
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.el .sp 10p
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.TB
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.ce
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\\*(NO
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.ie n .sp
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.el .sp 5p
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.if '\\$1'C' .ce 99
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.if '\\$2'C' .ce 99
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.in +5n
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.ll -5n
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.R
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..
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. \" Note End -- doug kraft 3/85
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.de NE
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.ce 0
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.in -5n
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.ll +5n
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.ie n .sp
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.el .sp 10p
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..
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.ny0
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.TH XGetEventData __libmansuffix__ __xorgversion__ "XLIB FUNCTIONS"
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.SH NAME
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XGetEventData, XFreeEventData, XGenericEventCookie \- retrieve and free additional event data through cookies.
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.SH SYNTAX
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.HP
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Bool XGetEventData\^(\^Display *\fIdisplay\fP\^, XGenericEventCookie *\fIcookie\fP\^);
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.HP
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void XFreeEventData\^(\^Display *\fIdisplay\fP\^, XGenericEventCookie *\fIcookie\fP\^);
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.HP
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.SH ARGUMENTS
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.IP \fIdisplay\fP 1i
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Specifies the connection to the X server.
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.IP \fIcookie\fP 1i
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Specifies the cookie to free or retrieve the data for.
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.SH STRUCTURES
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.Ds 0
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.TA .5i 3i
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.ta .5i 3i
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typedef struct {
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int type;
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unsigned long serial;
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Bool send_event;
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Display *display;
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int extension;
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int evtype;
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unsigned int cookie;
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void *data;
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} XGenericEventCookie;
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.De
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.SH DESCRIPTION
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Some extension
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.ZN XGenericEvents
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require additional memory to store information.
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For these events, the library returns a
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.ZN XGenericEventCookie
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with a token ('cookie') unique to this event. The
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.ZN XGenericEventCookie 's
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data pointer is undefined until
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.ZN XGetEventData
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is called.
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The
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.ZN XGetEventData
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function retrieves this extra data for the given cookie. No round-trip to
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the server is required. If the cookie is invalid or the
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event is not an event handled by cookie handlers,
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.ZN False
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is returned. If
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.ZN XGetEventData
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returns
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.ZN True ,
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the cookie's data pointer points to the memory containing the event
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information. A client must call
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.ZN XFreeEventData
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to free this memory.
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.ZN XGetEventData
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returns
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.ZN False
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for multiple calls for the same event cookie.
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The
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.ZN XFreeEventData
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function frees the data associated with a cookie. A client must call
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.ZN XFreeEventData
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for each cookie claimed with
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.ZN XGetEventData .
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.SH EXAMPLE CODE
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.Ds 0
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.TA .5i 3i
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.ta .5i 3i
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XEvent event;
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XGenericEventCookie *cookie = &ev;
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XNextEvent(display, &event);
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if (XGetEventData(display, cookie)) {
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handle_cookie_event(cookie->data);
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} else
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handle_event(&event);
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}
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XFreeEventData(display, cookie);
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.De
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.SH NOTES
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A cookie is defined as unclaimed if it has been returned to the client
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through
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.ZN XNextEvent
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but its data has not been retrieved via
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.ZN XGetEventData .
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Subsequent calls to
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.ZN XNextEvent
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may free memory associated with unclaimed cookies.
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Multi-threaded X clients must ensure that
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.ZN XGetEventData
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is called before the next call to
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.ZN XNextEvent .
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.SH "SEE ALSO"
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XNextEvent(__libmansuffix__),
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.br
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\fI\*(xL\fP
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