Thanks Bob and Thomas. I expected that the system will see that the pointer is invalid, but you are right: it cannot know that. Now everything is clear. Thanks!
Daniel Thomas W. Clay wrote: > Try: > > t := nil; > t.free(); > > > > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf > Of CubicDesign > Sent: Saturday, July 12, 2008 10:31 > To: Borland's Delphi Discussion List > Subject: Re: Application will never crash!!! > > No, no, no, no, no.... :) > Sorry... I didn't make myself clear! > > I know how to free an object. This is not the point of my email at all. > I just wanted to create a piece of code that is supposed to crash (AV) > the program. > > And > > var t: tobject; > begin > t.free; > end; > > should do that. Right? Well, in my case it doesn't!! This is my problem! > Why the application doesn't crash????? > > I will repeat the initial conditions: brand new Delphi, no update, no > IDE experts, brand new Windows XP SP2 (with updates) but no other programs. > Also: if I disable Compiler Optimization, the application works as > expected (access violation). > > Thanks. > > > > > Dean Stow wrote: > >> Before freeing T, you need to have created it. >> >> What is likely happening is that the address pointer for the variable T is >> starting out pointing to a part of memory that if treated as a stringlist >> and Free is called will close the form but not the application. >> >> I would suspect that there is nothing wrong with your computer and nothing >> wrong with Delphi. You are just doing something that is unsafe. You are >> accessing a method of an uninitialized object. >> >> The compiler optimization is bypassing the internal code that checks for >> such problems and is assuming that the code has been thoroughly debugged >> > and > >> that you know exactly what you are up to. >> >> I hope this is helpful. >> >> Dean >> >> >> -----Original Message----- >> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On >> > Behalf > >> Of CubicDesign >> Sent: Friday, July 11, 2008 2:19 PM >> To: undisclosed-recipients: >> Subject: Application will never crash!!! >> >> Hi. >> >> Recently I have discovered that my application will not crash if I run >> this code with "compiler optimization" turned on. >> >> Procedure TForm.buttonclick(sneder: tobject); >> Var t: tstringlist; >> Begin >> t.free; >> End; >> >> If I push the button that calls this code, the main for disappear but >> the application still remains in memory. I have to use Ctrl+Alt+Del to >> kill it. >> >> I have reinstalled Delphi, but this still didn't fixed my problem. Then >> I have reinstalled Windows, and again Delphi, without the Update1 and >> without 3^rd part components or IDE experts. Still not working. >> >> I don't know what to try else. A new computer? :) >> >> _______________________________________________ >> Delphi mailing list -> [email protected] >> http://lists.elists.org/cgi-bin/mailman/listinfo/delphi >> Hurley and Associates believes positions are unique to each person's >> risk bearing ability, marketing strategy, and crop conditions, >> therefore we give no blanket recommendations. The risk of loss >> in trading commodities can be substantial, therefore carefully >> consider whether such trading is suitable for you in light of >> your financial condition. NFA Rules require us to advise you >> that past performance is not indicative of future results, and >> there is no guarantee that your trading experience will be similar >> to past performance. >> >> Hurley and Associates believes positions are unique to each person's >> risk bearing ability, marketing strategy, and crop conditions, >> therefore we give no blanket recommendations. The risk of loss >> in trading commodities can be substantial, therefore carefully >> consider whether such trading is suitable for you in light of >> your financial condition. NFA Rules require us to advise you >> that past performance is not indicative of future results, and >> there is no guarantee that your trading experience will be similar >> to past performance. >> >> _______________________________________________ >> Delphi mailing list -> [email protected] >> http://lists.elists.org/cgi-bin/mailman/listinfo/delphi >> >> >> > _______________________________________________ > Delphi mailing list -> [email protected] > http://lists.elists.org/cgi-bin/mailman/listinfo/delphi > > __________ Information from ESET NOD32 Antivirus, version of virus signature > database 3263 (20080711) __________ > > The message was checked by ESET NOD32 Antivirus. > > http://www.eset.com > > > > __________ Information from ESET NOD32 Antivirus, version of virus signature > database 3263 (20080711) __________ > > The message was checked by ESET NOD32 Antivirus. > > http://www.eset.com > > > > __________ Information from ESET NOD32 Antivirus, version of virus signature > database 3263 (20080711) __________ > > The message was checked by ESET NOD32 Antivirus. > > http://www.eset.com > > > _______________________________________________ > Delphi mailing list -> [email protected] > http://lists.elists.org/cgi-bin/mailman/listinfo/delphi > > _______________________________________________ Delphi mailing list -> [email protected] http://lists.elists.org/cgi-bin/mailman/listinfo/delphi
