VNC Enables/Causes Windows Apps to Crash

Chris Gillard chris "at" bluesquare.co.uk
Mon, 04 Mar 2002 15:31:21 +0000


Ron,

To follow up a bit more on this....we are already running Tight
1.2.2, I didnt know this, the latest version & getting the same
problem as you.

Not many people coming up with any ideas on this  for us !!

Chris

On Sat, 2 Mar 2002 23:28:32 -0500, Ron Struempf wrote:
>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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-- Chris Gillard, chris "at" bluesquare.co.uk on 04/03/2002
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