When the sub form closes, only the controls on the sub form are freed for example
In form 1 I have myedit : tedit; // my own declaration; i create a form 2 which I drop an edit box (it will be automatically names edit1) so on form 1 I do; myedit = form2.edit1; I can manipulate the contents of the edit on form 2 by either using form1.edit1.text:='jangita' or I can use myedit.text:='jangita'; This is because these variables are actually pointers and point to the same component in memory. When I close form2; the edit box is automatically freed (it sits on form2 and form2 is the owner) So any reference weather is using myedit.text:='hello' or form2.edit2.text:='hello' will raise an access violation exception. So to your question if you free form2; then the assignment is invalid. Hope it helps . J PO Box 627 00502 Karen, Nairobi, Kenya. Mobile: +254 722 996532 Fixed: +254 20 2050859 [EMAIL PROTECTED] _____ From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of edsynergy Sent: 23 January 2008 1:28 p To: [email protected] Subject: [delphi-en] Re: Assigning object J, no problem with subform, its really about the assignment of edit1 on the mainform. edit1 on the mainform is just a declaration of a Tedit, its not actually on the form. My concern is what happens to it when the subform closes. Ed.. --- In [EMAIL PROTECTED] <mailto:delphi-en%40yahoogroups.com> ps.com, "Jangita" <[EMAIL PROTECTED]> wrote: > > Ed, > > > > Are these declarations created by Delphi or are you the one who has put them > into the code manually? > > From what I have read; if you close the sub form its tedit (the one on the > sub form) is deallocated automatic because when you drop a control onto a > form its owner property is the parent control (be it a form or a panel) so > when the form is freed or destroyed it automatically frees all the > components and their "dependants" with it. This is true weather you have > assigned its variable (in code) to another control or not. > > > > Maybe if you explain what you want to achieve with this? > > > > J > > > > PO Box 627 00502 Karen, > > Nairobi, Kenya. > > Mobile: +254 722 996532 > > Fixed: +254 20 2050859 > > [EMAIL PROTECTED] > > > > _____ > > From: [EMAIL PROTECTED] <mailto:delphi-en%40yahoogroups.com> ps.com [mailto:[EMAIL PROTECTED] <mailto:delphi-en%40yahoogroups.com> ps.com] On Behalf > Of edsynergy > Sent: 23 January 2008 1:14 p > To: [EMAIL PROTECTED] <mailto:delphi-en%40yahoogroups.com> ps.com > Subject: [delphi-en] Assigning object > > > > Ok , > I have a main form and several sub forms that get called from the main > form > > In the public of the main form I could have something like this > edit1:Tedit; > > In my subform I have a Tedit on the form > > In my subform I do this mainform.edit1 := subform Tedit; > > When I close the subform what happens to edit1 on the mainform ? > Is it automatically unassigned, if not does it get cleaned up when the > main form closes. > > Should I in the onclose event of the subform do mainform.edit1 := nil; > > All advice welcome > > Best wishes Ed. > > > > > > [Non-text portions of this message have been removed] > [Non-text portions of this message have been removed]
