Ok. I will take a look and see what teh error is. I am at work now not at home, so I will try and look at lunch time.
It does seem that the object is beign detroyed or freed, but I could not see where etc. Report back after lunch Thanks, Jeremy -----Original Message----- From: "Paul Grimstrup" <[EMAIL PROTECTED]> To: Multiple recipients of list delphi <[EMAIL PROTECTED]> Date: Tue, 13 Nov 2001 10:42:19 +1300 Subject: RE: [DUG]: Class Problem > > If the address it was reading was something like $B48764 then the > fOwner or > the object has been destroyed. If the address it was reading was > $FFFFFF?? > or $000000?? then it was trying to access a property or virtual method > on a > nil pointer. > > In the destructor of TMyComponent, I assume you are freeing the > TMyClass. > > You could set Compiler options to include debug .dcu files and step > through > the Delphi Code. > > But it sounds like you may be keeping your own reference to the > TMyComponent > or TMyClass instance then using that reference after the object has > been > destroyed. If TMyComponent is free'd, are you clearing all external > references? (using a FreeNotification for TMyComponent). If you are > using > FreeNotification/Notification, make sure that in > TMyComponent.Notification() > you are calling inherited. > > Break the code into smaller statements and debug it that way: > o := fOwner; > ShowMessage(o.Name); > i := o.ComponentIndex; > ShowMessage(IntToStr(i)); > > If you get an AV accessing fOwner then your object has already been > destroyed. > If you get an AV accessing fOwner.Name then fOwner has already been > destroyed. > If you get an AV accessing o.ComponentIndex then you will need to step > through the Delphi code to see what's wrong. > > ----------------------------------------------------------------------- > ---- > New Zealand Delphi Users group - Delphi List - [EMAIL PROTECTED] > Website: http://www.delphi.org.nz > To UnSub, send email to: [EMAIL PROTECTED] > with body of "unsubscribe delphi" > Web Archive at: http://www.mail-archive.com/delphi%40delphi.org.nz/ --------------------------------------------------------------------------- New Zealand Delphi Users group - Delphi List - [EMAIL PROTECTED] Website: http://www.delphi.org.nz To UnSub, send email to: [EMAIL PROTECTED] with body of "unsubscribe delphi" Web Archive at: http://www.mail-archive.com/delphi%40delphi.org.nz/
