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<HTML><HEAD><TITLE>Xlib Programming Manual: XGetMotionEvents</TITLE></HEAD><BODY><H1 ALIGN=center>XGetMotionEvents</H1><H2>Syntax</H2><!.IN "XGetMotionEvents" "" "@DEF@"><CODE><PRE>XTimeCoord *XGetMotionEvents(<B>display</B>, <B>w</B>, <B>start</B>, <B>stop</B>, <B>nevents_return</B>) <A HREF="../display/opening.html#Display">Display</A> *<B>display</B>; Window <B>w</B>; Time <B>start</B>, <B>stop</B>; int *<B>nevents_return</B>;</PRE></CODE><H2>Arguments</H2><TABLE><TR><TD> <B>display</B><TD> Specifies the connection to the X server.<TR><TD> <B>w</B><TD> Specifies the window.<TR><TD> <B>start</B><BR> <B>stop</B><TD> Specify the time interval in which the events are returned from the motionhistory buffer.You can pass a timestamp or<B>CurrentTime</B>.<TR><TD> <B>nevents_return</B><TD> Returns the number of events from the motion history buffer.</TABLE><H2>Description</H2>The<B>XGetMotionEvents()</B>function returns all events in the motion history buffer that fall between thespecified start and stop times, inclusive, and that have coordinatesthat lie within the specified window (including its borders) at its presentplacement.If the server does not support motion history, if the start time is later than the stop time,or if the start time is in the future, no events are returned;<B>XGetMotionEvents()</B>returns NULL.If the stop time is in the future, it is equivalent to specifying<B>CurrentTime</B> .The return type for this function is a structure defined as follows:<A NAME="XTimeCoord"></A><P><!.IN "XTimeCoord" "" "@DEF@"><PRE><CODE>typedef struct { Time time; short x, y;} XTimeCoord;</PRE></CODE><P>The <B>time</B> member is set to the time, in milliseconds. The <B>x</B> and <B>y</B> members are set to the coordinates of the pointer andare reported relative to the originof the specified window.To free the data returned from this call, use<B><A HREF="../display/XFree.html">XFree()</A></B>.<P><B>XGetMotionEvents()</B>can generate a<B>BadWindow</B> error.<H2>Diagnostics</H2><TABLE><TR><TD><B>BadWindow</B><TD>A value for a Window argument does not name a defined Window.</TABLE><H2>See also</H2><B><A HREF="XDisplayMotionBufferSize.html">XDisplayMotionBufferSize()</A></B>,<B><A HREF="manipulating-event-queue/XIfEvent.html">XIfEvent()</A></B>,<B><A HREF="manipulating-event-queue/XNextEvent.html">XNextEvent()</A></B>,<B><A HREF="XPutBackEvent.html">XPutBackEvent()</A></B>,<B><A HREF="XSendEvent.html">XSendEvent()</A></B>,"<A HREF="getting-pointer-motion-history.html">Getting Pointer Motion History</A>".<HR><ADDRESS><A HREF="http://tronche.com/">Christophe Tronche</A>, <A HREF="mailto:ch.tronche@computer.org">ch.tronche@computer.org</A></ADDRESS></BODY></HTML>⌨️ 快捷键说明
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