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<HTML><HEAD><TITLE>Library Procedures - Tk_SetClass manual page</TITLE></HEAD><BODY>
<H3><A NAME="M2">NAME</A></H3>
Tk_SetClass, Tk_Class - set or retrieve a window's class
<H3><A NAME="M3">SYNOPSIS</A></H3>
<B>#include &lt;tk.h&gt;</B><BR>
<B>Tk_SetClass</B>(<I>tkwin, class</I>)<BR>
<A HREF="../TkLib/GetUid.htm">Tk_Uid</A><BR>
<B>Tk_Class</B>(<I>tkwin</I>)<BR>
<H3><A NAME="M4">ARGUMENTS</A></H3>
<DL>
<P><DT>Tk_Window <B>tkwin</B> (in)<DD>
Token for window.
<P><DT>char <B>*class</B> (in)<DD>
New class name for window.
<P></DL>
<H3><A NAME="M5">DESCRIPTION</A></H3>
<B>Tk_SetClass</B> is called to associate a class with a particular
window.  The <I>class</I> string identifies the type of the
window;  all windows with the same general class of behavior
(button, menu, etc.) should have the same class.  By
convention all class names start with a capital letter, and
there exists a Tcl command with the same name as
each class (except all in lower-case) which can be used to
create and manipulate windows of that class.
A window's class string is initialized to NULL
when the window is created.
<P>
For main windows, Tk automatically propagates the name and class
to the WM_CLASS property used by window managers.  This happens
either when a main window is actually created (e.g. in
<B><A HREF="../TkLib/CrtWindow.htm">Tk_MakeWindowExist</A></B>), or when <B>Tk_SetClass</B>
is called, whichever occurs later.  If a main window has not been
assigned a class then Tk will not set the WM_CLASS property for
the window.
<P>
<B>Tk_Class</B> is a macro that returns the
current value of <I>tkwin</I>'s class.  The value is returned
as a <A HREF="../TkLib/GetUid.htm">Tk_Uid</A>, which may be used just like a string pointer but also has
the properties of a unique identifier (see the manual entry for
<B><A HREF="../TkLib/GetUid.htm">Tk_GetUid</A></B> for details).
If <I>tkwin</I> has not yet been given a class, then
<B>Tk_Class</B> will return NULL.

<H3><A NAME="M6">KEYWORDS</A></H3>
<A href="../Keywords/C.htm#class">class</A>, <A href="../Keywords/U.htm#unique identifier">unique identifier</A>, <A href="../Keywords/W.htm#window">window</A>, <A href="../Keywords/W.htm#window manager">window manager</A>
<HR><PRE>
<A HREF="../copyright.htm">Copyright</A> &#169; 1990 The Regents of the University of California.
<A HREF="../copyright.htm">Copyright</A> &#169; 1994-1996 Sun Microsystems, Inc.
<A HREF="../copyright.htm">Copyright</A> &#169; 1995-1997 Roger E. Critchlow Jr.</PRE>
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