Dear Sean, Eddy and all the others that replied to this thread. I've managed to track down the problem to a jvWaitingGradiant control that I had on the form to indicate to users that the application was busy and response may be slow. As soon as I removed the control the thread error went away!
Many thanks to you all. Paul. > ----- Original Message ----- > From: "Sean Roberts" <[EMAIL PROTECTED]> > To: advanced_delphi@yahoogroups.com > Subject: RE: [advanced_delphi] TThread Error > Date: Fri, 20 Jun 2008 12:48:55 -0400 > > > Welcome to threading-hell. > > I went through this - I suspect most of us have gone through this > at one time or another as we started to play with threading. > > The only thing I can suggest, as did another writer, is not to have > any thread code in the OnCreate event of a form. > > I would always specifically create my threads completely and then > send/deploy them as the very last step. > > Also make sure they are synchronized properly - especially if they > have to report data back to the main app thread. > > One other thing that might help you is to look at the threading > example that comes with D7 Enterprise. That helped me get started. > > Good luck! > > - Sean > > "Save the whales, save the rainforests, but FREE the threads!"XFX > nForce 680i LT SLI Socket 775 | Intel Core 2 Duo E6750 OC:1600 FSB > @ 3.2 MHz | 2 x OCZ SLI 1024MB PC6400 DDR2 800MHz| XION 600w PSU | > CM Stacker 200 ATX/BTX Case | EVGA GeForce 8800 GTS 512 | WD SATA > 74 GB Raptor (boot/system), WD SATA 500 GB (storage) | Windows XP > Pro, SP3 | Patient and supportive significant other > > > To: [EMAIL PROTECTED]: [EMAIL PROTECTED]: > Fri, 20 Jun 2008 08:46:00 +0000Subject: Re: [advanced_delphi] > TThread Error > > > > > Dear Eddy,Its worse than I thought!!!I tried your suggestion - no > good. I then installed Microsofts Virtual PC (6.0.192.0), setup > Win98SE & Delphi 7 (Build 8.1). I made a copy of the Project in a > seperate folder on our development server and tried to open the > project. I am now getting the Thread Error message as the project > loads. The main forms' code module is displayed but the actual form > is not available!I think the answer may be to roll the copy back to > before I added the thread code and then re-apply the new code in > the Win98 VM environment until it breaks - unless anybody has any > quicker suggestions.Paul.> ----- Original Message -----> From: > "Eddy Wijaya" <[EMAIL PROTECTED]>> To: > advanced_delphi@yahoogroups.com> Subject: Re: [advanced_delphi] > TThread Error> Date: Fri, 20 Jun 2008 09:05:44 +0700> > > Dear > Paul,> > Have you tried to moved your declaration of thread to> > AfterConstruction of the form ?> because creating a Thread on > construction form is some times could> caused you a pain why ? > because it is possible that the thread accessing> variable that> > possible not created yet.so it is better safe to create the thread > on> AfterConstruction Procedure or.. u can create a trigger from > the form> ex: when showing the form then create the thread.> > > regards,> Eddy Wijaya> > > VCL,Tips,Snippet All Delphi And Codegear > Related Could Be Found here> http://www.alldelphi.com> > Paul > Bennett wrote:> >> > Hi All,> > Can anyone help with this one?> >> > > I have an application written using D7 Ent. which runs fine on > XP and> > 98SE. Currently the application loads its data from a CD, > but the> > powers that be have decided that they would like to > network the> > application and download the data periodically > across the LAN.> >> > In order to achieve this I have created a > small helper class> > (TAutoDownload) which is owned and created by > the main form. This> > helper class is created during the Form > Creation procedure and freed> > by the Form Destructor.> >> > > TAutoDownload contains 2 TThread objects, 1) a Timer Thread, and > 2)> > the thread that handles the actual download of the Data > Files. Both> > threads are created as and when required by the > Class.> >> > The new application works fine when running on XP, but > as soon as I> > try to run it under 98' it crashes with the > following error:> >> > Error Creating Form: Thread Error: The > Parameter is incorrect (87).> >> > As far as I can tell this error > occurs during the Main Forms Creation> > (but before any of the > FormCreate code executes - ie the code never> > gets as far as a > breakpoint on the first line of the FormCreate> > procedure).> >> > > I've done a Google on TThread Errors, Delphi 7 and Win98, but the > only> > hit that seems to be relevant refers to bug in the TThreads > destructor> > method. I have implemented the suggested change, but > it has had no effect.> >> > Any ideas would be very welcome.> >> > > TIA> >> > Paul.> >> >> > > ----------------------------------------------------------> >> >> > > No virus found in this incoming message.> > Checked by AVG. > Version: 8.0.100 / Virus Database: 270.4.0/1508 - > > Release Date: > 6/18/2008 9:08 PM> >>Experience is something you don't get until > just after you need it. -- > _______________________________________________Surf the Web in a > faster, safer and easier way:Download Opera 9 at > http://www.opera.comPowered by Outblaze > > > > > > > _________________________________________________________________ > Earn cashback on your purchases with Live Search - the search that > pays you back! > http://search.live.com/cashback/?&pkw=form=MIJAAF/publ=HMTGL/crea=earncashback > Experience is something you don't get until just after you need it. -- _______________________________________________ Surf the Web in a faster, safer and easier way: Download Opera 9 at http://www.opera.com Powered by Outblaze
