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<HTML><HEAD><TITLE>Xlib Programming Manual: ClientMessage Events</TITLE></HEAD><BODY><H1 ALIGN=center>10.13.1 ClientMessage Events</H1><!.IN "Events" "ClientMessage"><!.IN "ClientMessage" "" "@DEF@">The X server generates<B>ClientMessage</B>events only when a client calls the function<B><A HREF="../../event-handling/XSendEvent.html">XSendEvent()</A></B>.<A NAME="XClientMessageEvent"></A><P>The structure for this event type contains:<P><!.IN "XClientMessageEvent" "" "@DEF@"><PRE><CODE>typedef struct { int type; /* ClientMessage */ unsigned long serial; /* # of last request processed by server */ Bool send_event; /* true if this came from a <B><A HREF="../../appendix/a.html#SendEvent">SendEvent</A></B> request */ Display *display; /* Display the event was read from */ Window window; Atom message_type; int format; union { char b[20]; short s[10]; long l[5]; } data;} XClientMessageEvent;</PRE></CODE><P>The <B>message_type</B> member is set to an atom that indicates how the data should be interpreted by the receiving client.The <B>format</B> member is set to 8, 16, or 32 and specifies whether the datashould be viewed as a list of bytes, shorts, or longs.The <B>data</B> member is a union that contains the members <B>b</B>, <B>s</B>, and <B>l</B>.The <B>b</B>, <B>s</B>, and <B>l</B> members represent data of 20 8-bit values, 10 16-bit values, and 5 32-bit values.Particular message types might not make use of all these values.The X server places no interpretation on the values in the <B>window</B>,<B>message_type</B>, or <B>data</B> members.<H5 ALIGN=right><I>Next: <A HREF="property.html">PropertyNotify Events</A></I></H5><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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