VNC Enables/Causes Windows Apps to Crash

Ron Struempf marvin "at" siriussoft.com
Sun, 03 Mar 2002 04:33:39 +0000


I'm at least glad to hear I am not the only one.  I get by by clicking the
controls whenever I restart the system, but I need a more solid solution.

_Ron

----- Original Message -----
From: "Chris Gillard" <chris "at" bluesquare.co.uk>
To: <vnc-list "at" uk.research.att.com>
Sent: Saturday, March 02, 2002 2:59 PM
Subject: Re: VNC Enables/Causes Windows Apps to Crash


: Ron,
:
: I see the same problem with some of our Delphi 5 apps running on
: NT4/SP6a servers and VNC 3.3.3R9.
:
: We have had this problem for a year or so, but have always doubted
: our own Delphi work.
:
: Literally in the last few days we had pinned it down to the use of
: VNC & certain mouse movements. You have got this in more detail.
:
: We had tried different video drivers, to no avail.
:
: My next move is to try Tight VNC to see if it is any different.
:
: A real shame as VNC has been a great tool for us.
:
: If anyone else has any bright ideas ??
:
: Regards
:
: Chris
:
: -- Chris Gillard, chris "at" bluesquare.co.uk on 02/03/2002
:
: On Sat, 2 Mar 2002 11:30:11 -0500, Ron Struempf wrote:
: >Several of my Windows apps, written in CBuilder and Delphi, crash
: >when
: >WinVNC is running.  I saw the FAQ Q39, but it says "disable any
: >screen
: >savers" of which I have none.  I've been using Procomm Rapid Remote
: >for a
: >very long time to access these servers, but switched to WinVNC
: >because Rapid
: >Remote is the only app I've seen so far that crashes XP.
: >
: >We are running WinVNC 3.3.3 R9 in App Mode on NT 4.0 Server.
: >
: >What I've found is:
: >- The app crashes in one of several mouse events (such as
: >CM_NCHITTEST)
: >- In my debugging, it appears as though the associated
: >WM_NCHITTEST
: >message never appeared
: >- The crash happens when the mouse cursor passes over the
: >statusbar
: >- The crash happens whether I am connected via VNC or Rapid Remote,
: >and
: >probably local as well
: >- I believe that the crashes continue to happen even after I close
: >VNC,
: >but apparently at a much lower
: >frequency.
: >
: >I have also found that if I physically click on each focusable
: >control on
: >the app, that the crash does not occur again until the app is
: >restarted.
: >
: >My theory is that WinVNC is absconding with some of the WM_????
: >messages,
: >but not suppressing the CM_???? messages they generate.  Thus, when
: >the app
: >processes the control message (CM_???), it expects initialization to
: >have
: >been performed when the Windows message (WM_???) was received.  By
: >clicking
: >on each of the controls, I force it to do that initialization, so
: >the crash
: >doesn't happen.
: >
: >_Ron
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