[DUG] Delphi disappearing from taskbar

[Ross Levis]

I've used all versions of Windows and from Windows 95 onwards, I've only seen this happen when Explorer has crashed.  It's up to the individual applications to re-create the system tray icons when the tray is re-created after an Explorer crash.

When explorer closes and is re-started, it does not know what was in the system tray previously, nor what is supposed to be there.  When the shell re-starts, it sends a system-wide broadcast message, WM_TASKBARCREATED.  Since this is a broadcast message, all running apps are supposed to hear this message and if they have system tray icons, recreate them.

I recently had a complaint that my app was not doing this so I investigated it and modified the RxTrayIcon component I use to check for this message. 

Ross.
  ----- Original Message ----- 
  From: Rohit Gupta 
  To: johnkbird at paradise.net.nz ; NZ Borland Developers Group - Delphi List 
  Sent: Thursday, April 12, 2007 8:41 AM
  Subject: Re: [DUG] Delphi disappearing from taskbar


  Its a bug in Windows, fullstop (ie in all versions).  Despite the three major rewrites they have done.  :-)

  John Bird wrote: 
I have seen this with other icons also disappearing from the task bar.  A
rare occurrence but I am sure!.  I am fairly sure this is a bug in XP, as it
is not to do with certain programs - eg sometimes Outlook disappears,
sometimes Firefox, sometimes something else.   The Alt/Tab list does still
have it.

Related is the one where the task bar icon is highighted (ie has focus) but
the window is nowhere to be seen.  I have to minimise and maximise the
window sometimes a couple of times to get it back in front.  This is a bit
more common on my PC that the first one...

John

-----Original Message-----
From: delphi-bounces at delphi.org.nz [mailto:delphi-bounces at delphi.org.nz] On
Behalf Of Alister Christie
Sent: Wednesday, 11 April 2007 4:33 p.m.
To: NZ Borland Developers Group - Delphi List
Subject: Re: [DUG] Delphi disappearing from taskbar


Hmmm, yup that puts it back, I'm sure there is a reasonable explanation 
for this - but I doubt I'll ever know it

Alister Christie
Computers for People
Ph: 04 471 1849 Fax: 04 471 1266
http://www.salespartner.co.nz
PO Box 13085
Johnsonville
Wellington 



Jeremy North wrote:
  If you have D2007 installed, minimize and maximize the IDE. If you 
don't have D2006 installed - then I happen experienced it myself.

On 4/11/07, Alister Christie <alister at salespartner.co.nz> wrote:
    I don't know if anyone else has seen this, but from time to time 
D2006 vanishes from my task bar - I can still get to it via alt+tab, 
but it's just bizarre.
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  -- 

  Rohit Gupta
  B.E. Elec.   M.E.   Mem IEEE    Associate IEE
  Technical Manager
  Computer Fanatics Limited

  Tel     +64 9 4892280
  Fax    +64 9 4892290
  Email  rohit at cfl.co.nz
  Web    www.cfl.co.nz


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