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
