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From: mac@TRANTOR.HARRIS-ATD.COM (Mike McDonald)
Newsgroups: comp.windows.x
Subject: Re: XGrabPointer and ButtonPress
Message-ID: <19890215151253.3.MAC@titan.harris-atd.com>
Date: 15 Feb 89 15:12:00 GMT
References: <8902151332.AA03428@EXPIRE.LCS.MIT.EDU>
Sender: daemon@bloom-beacon.MIT.EDU
Organization: The Internet
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    Date: Wed, 15 Feb 89 08:32:34 EST
    From: rws@expo.lcs.mit.edu (Bob Scheifler)

    You're getting a BadAccess on ChangeActivePointerGrab because your
    application is using two connections in conflict.  On one connection
    you select for ButtonPress on the root window.  When the button gets
    pressed, a grab is activated.  Subsequently you try to ChangeActivePointerGrab
    on the *other* connection.  This is a no-no.  A "client" is defined by
    a connection, not by an address space.

  And I imagine that there is no way to find an already existing
connection using Xlib. What I was trying to do was implement a SunWindows
compatible library. Most of the users around here have Suns and won't
consider switching to X unless I find an easy way for them to convert
their existing code. I'll have to rethink my approach now.

  Thanks for your time.

  Mike McDonald

P.S. I think you should be able to grab the mouse even if another
connection has it grabbed. Example usage: The system is going down so I
pop up a notifier on your screen. I want the user to have to acknowledge
the notifier immediately so I can either stop the shutdown or continue
without having to listen to the user belly ache later about the system
being down while he has so much important news to read.