Path: utzoo!attcan!uunet!cs.utexas.edu!sun-barr!apple!bloom-beacon!EXPO.LCS.MIT.EDU!rws
From: rws@EXPO.LCS.MIT.EDU
Newsgroups: comp.windows.x
Subject: Re: getting type from XID
Message-ID: <8905111240.AA00703@expire.lcs.mit.edu>
Date: 11 May 89 12:40:22 GMT
References: <1049@quintus.UUCP>
Sender: daemon@bloom-beacon.MIT.EDU
Organization: The Internet
Lines: 14


    The XWMHints struct contains a bare XID,
    and my program needs to find out what kind of XID it is.

It should always be a Window.  The ICCCM states this.

    Also, there's
    a DRAWABLE property type, and it would be nice to be able to find out
    whether one of these is a pixmap or window.

There's no wonderful way to determine this, that I can think of off-hand.
You probably have to try a window-operation (e.g. XGetWindowAttributes)
and see if it fails.  You'll have to install an error handler while you
do this.