Path: utzoo!utgpu!news-server.csri.toronto.edu!clyde.concordia.ca!uunet!snorkelwacker!bloom-beacon!EXPO.LCS.MIT.EDU!rws
From: rws@EXPO.LCS.MIT.EDU (Bob Scheifler)
Newsgroups: comp.windows.x
Subject: Re: XGetWindowAttributes
Message-ID: <9006152053.AA10572@expire.lcs.mit.edu>
Date: 15 Jun 90 20:53:13 GMT
References: <4b057b34.20b6d@apollo.HP.COM>
Sender: root@athena.mit.edu (Wizard A. Root)
Organization: The Internet
Lines: 9


    Has anyone out there ever successfully called XGetWindowAttributes
    specifying a pixmap id instead of a window id?  O'Reilly & Associates
    claims that this is permissable,

The Bible tells you not so. :-)  See the official R4 Xlib or Protocol manual.
I'm afraid the O'Reilly book is in error here.

If you want root/width/height information, use XGetGeometry.