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<HTML><HEAD><TITLE>Xlib Programming Manual: XSelectInput</TITLE></HEAD><BODY><H1 ALIGN=center>XSelectInput</H1><H2>Syntax</H2><!.IN "XSelectInput" "" "@DEF@"><CODE><PRE>XSelectInput(<B>display</B>, <B>w</B>, <B>event_mask</B>) <A HREF="../display/opening.html#Display">Display</A> *<B>display</B>; Window <B>w</B>; long <B>event_mask</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 whose events you are interested in.<TR><TD> <B>event_mask</B><TD> Specifies the event mask.</TABLE><H2>Description</H2> The<B>XSelectInput()</B>function requests that the X server report the events associated with the specified event mask.Initially, X will not report any of these events.Events are reported relative to a window.If a window is not interested in a device event, it usually propagates tothe closest ancestor that is interested,unless the do_not_propagate mask prohibits it.<!.IN "Event" "propagation"><P>Setting the <A HREF="../window/attributes/event-and-do-not-propagate.html">event-mask</A> attribute of a window overrides any previous callfor the same window but not for other clients.Multiple clients can select for the same events on the same windowwith the following restrictions:<UL><P><LI>Multiple clients can select events on the same window because their event masksare disjoint.When the X server generates an event, it reports itto all interested clients.<P><LI>Only one client at a time can select<B><A HREF="../events/structure-control/circulate.html">CirculateRequest</A></B>,<B><A HREF="../events/structure-control/configure.html">ConfigureRequest</A></B>,or<B><A HREF="../events/structure-control/map.html">MapRequest</A></B>events, which are associated withthe event mask<B><A HREF="../events/processing-overview.html#SubstructureRedirectMask">SubstructureRedirectMask</A></B>. <P><LI>Only one client at a time can selecta<B><A HREF="../events/structure-control/resize.html">ResizeRequest</A></B>event, which is associated withthe event mask<B><A HREF="../events/processing-overview.html#ResizeRedirectMask">ResizeRedirectMask</A></B>. <P><LI>Only one client at a time can select a <B><A HREF="../events/keyboard-pointer/keyboard-pointer.html">ButtonPress</A></B> event, which is associated withthe event mask<B><A HREF="../events/processing-overview.html#ButtonPressMask">ButtonPressMask</A></B>.</UL><P>The server reports the event to all interested clients.<P><B>XSelectInput()</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>"<A HREF="selecting.html">Selecting Events</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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