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<HTML><HEAD><TITLE>Xlib Programming Manual: XEventsQueued</TITLE></HEAD><BODY><H1 ALIGN=center>XEventsQueued</H1><!.IN "XEventsQueued" "" "@DEF@"><H2>Syntax</H2><CODE><PRE>int XEventsQueued(<B>display</B>, <B>mode</B>) <A HREF="../display/opening.html#Display">Display</A> *<B>display</B>; int <B>mode</B>;</PRE></CODE><H2>Arguments</H2><TABLE><TR><TD> <B>display</B><TD> Specifies the connection to the X server.<TR><TD> <B>mode</B><TD> Specifies the mode.You can pass<B>QueuedAlready</B>,<B>QueuedAfterFlush</B>,or<B>QueuedAfterReading</B>.</TABLE><H2>Description</H2>If mode is <B>QueuedAlready</B>,<B>XEventsQueued()</B>returns the number of eventsalready in the event queue (and never performs a system call).If mode is <B>QueuedAfterFlush</B>, <B>XEventsQueued()</B>returns the number of events already in the queue if the number is nonzero.If there are no events in the queue, <B>XEventsQueued()</B>flushes the output buffer, attempts to read more events out of the application's connection,and returns the number read.If mode is <B>QueuedAfterReading</B>, <B>XEventsQueued()</B>returns the number of events already in the queue if the number is nonzero. If there are no events in the queue, <B>XEventsQueued()</B>attempts to read more events out of the application's connection without flushing the output buffer and returns the number read.<P><B>XEventsQueued()</B>always returns immediately without I/O if there are events already in thequeue.<B>XEventsQueued()</B>with mode <B>QueuedAfterFlush</B>is identical in behavior to<B><A HREF="XPending.html">XPending()</A></B>.<B>XEventsQueued()</B>with mode<B>QueuedAlready</B>is identical to the<B><A HREF="../display/display-macros.html#QLength">XQLength()</A></B>function.<H2>See also</H2><B><A HREF="XFlush.html">XFlush()</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="XPending.html">XPending()</A></B>,<B><A HREF="XPutBackEvent.html">XPutBackEvent()</A></B>,<B><A HREF="XSync.html">XSync()</A></B>,"<A HREF="event-queue-management.html">Event Queue Management</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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