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<HTML><HEAD><TITLE>Xlib Programming Manual: Setting and Reading the WM_CLASS Property</TITLE></HEAD><BODY><H1 ALIGN=center>14.1.8 Setting and Reading the WM_CLASS Property</H1>Xlib provides functions that you can use to set and get the <A HREF="/gui/x/icccm/sec-4.html#WM_CLASS">WM_CLASS</A> property for a given window.These functions use the<B>XClassHint</B>structure, which is defined in the<B><TT>X11/Xutil.h</TT></B>header file.<P>To allocate an<B>XClassHint</B>structure, use<B><A HREF="XAllocClassHint.html">XAllocClassHint()</A></B>.<P>The<B>XClassHint</B>contains:<A NAME="XClassHint"></A><P><!.IN "XClassHint" "" "@DEF@"><PRE><CODE>typedef struct { char *res_name; char *res_class;} XClassHint;</PRE></CODE><P>The <B>res_name</B> member contains the application name, and the <B>res_class</B> member contains the application class. Note that the name set in this property may differ from the name set as <A HREF="/gui/x/icccm/sec-4.html#WM_NAME">WM_NAME</A>.That is, <A HREF="/gui/x/icccm/sec-4.html#WM_NAME">WM_NAME</A> specifies what should be displayed in the title bar and,therefore, can contain temporal information (for example, the name ofa file currently in an editor's buffer).On the other hand, the name specified as part of <A HREF="/gui/x/icccm/sec-4.html#WM_CLASS">WM_CLASS</A> is the formal name of the applicationthat should be used when retrieving the application's resources from the resource database.<P>To set a window's <A HREF="/gui/x/icccm/sec-4.html#WM_CLASS">WM_CLASS</A> property, use<B><A HREF="XSetClassHint.html">XSetClassHint()</A></B>.<P>To read a window's <A HREF="/gui/x/icccm/sec-4.html#WM_CLASS">WM_CLASS</A> property, use<B><A HREF="XGetClassHint.html">XGetClassHint()</A></B>.<H5 ALIGN=right><I>Next: <A HREF="wm-transient-for.html">Setting and Reading the WM_TRANSIENT_FOR Property</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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