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<HTML><HEAD><TITLE>Xlib Programming Manual: XQueryTree</TITLE></HEAD><BODY><H1 ALIGN=center>XQueryTree</H1><H2>Syntax</H2><!.IN "Child Window"><!.IN "Parent Window"><!.IN "XQueryTree" "" "@DEF@"><CODE><PRE><A HREF="../introduction/errors.html#Status">Status</A> XQueryTree(<B>display</B>, <B>w</B>, <B>root_return</B>, <B>parent_return</B>, <B>children_return</B>, <B>nchildren_return</B>) <A HREF="../display/opening.html#Display">Display</A> *<B>display</B>; Window <B>w</B>; Window *<B>root_return</B>; Window *<B>parent_return</B>; Window **<B>children_return</B>; unsigned int *<B>nchildren_return</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 list of children, root, parent, and number of children you want to obtain.<TR><TD> <B>root_return</B><TD> Returns the root window.<TR><TD> <B>parent_return</B><TD> Returns the parent window.<TR><TD> <B>children_return</B><TD> Returns the list of children.<TR><TD> <B>nchildren_return</B><TD> Returns the number of children.</TABLE><H2>Description</H2>The<B>XQueryTree()</B>function returns the root ID, the parent window ID, a pointer to the list of children windows(NULL when there are no children), and the number of children in the list for the specified window.The children are listed in current stacking order, from bottommost (first) to topmost (last).<B>XQueryTree()</B>returns zero if it fails and nonzero if it succeeds.To free a non-NULL children list when it is no longer needed, use <B><A HREF="../display/XFree.html">XFree()</A></B>.<P><B>XQueryTree()</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><B><A HREF="../display/XFree.html">XFree()</A></B>,<B><A HREF="XGetWindowAttributes.html">XGetWindowAttributes()</A></B>,<B><A HREF="XQueryPointer.html">XQueryPointer()</A></B>,"<A HREF="obtain.html">Obtaining Window Information</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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