Re: [DUG] Self Freeing

[Paul Mckenzie]

Title: Message

I am very hesitant about calling Free within the event handler....   [Snip] from the Help: Warning: Never explicitly free a component within one of its own event handlers or the event handler of a component it owns or contains. For example, don�t free a button, or the form that owns the button, in its OnClick event handler.       Regards Paul McKenzie Analyst Programmer SMSS Ltd.   ----- Original Message ----- From: Stephen Bertram To: NZ Borland Developers Group - Delphi List Sent: Friday, March 19, 2004 10:11 AM Subject: RE: [DUG] Self Freeing My understanding is:   1. If a component has an owner then the owner will try to free it during its destroy method leading to an access violation if it is freed elsewhere.  So if you are explicitly freeing it create it with Create(Nil).  N.B. for newcomers - this is totally different to specifying the Parent.   2. There is no reason why the method assigned to OnExit can't be a static method.   Stephen -----Original Message----- From: Paul Mckenzie [mailto:[EMAIL PROTECTED] Sent: Friday, 19 March 2004 9:06 a.m. To: NZ Borland Developers Group - Delphi List Subject: Re: [DUG] Self Freeing I like having an Owner - (But could if necessary have no Owner). I want the Component initiate the free in a non-static method (eg OnExit, OnClick) No longer referring to the variable - that is not a problem.   This is all just in the main (only) thread.   Regards Paul McKenzie Analyst Programmer SMSS Ltd.   ----- Original Message ----- From: Stephen Bertram To: NZ Borland Developers Group - Delphi List Sent: Friday, March 19, 2004 8:46 AM Subject: RE: [DUG] Self Freeing AFAIK there is no problem executing Self.Free on the following conditions: 1. The object does not have an owner 2. The Self.Free statement is in a static method 3. The object is not later refered to from the generating program - either the object is not assigned to a variable or the variable is never accessed after the method call that results in the Free.   The real question is why you would want to do this outside a thread?   Stephen -----Original Message----- From: Stacey Verner [mailto:[EMAIL PROTECTED] Sent: Thursday, 18 March 2004 4:46 p.m. To: NZ Borland Developers Group - Delphi List Subject: RE: [DUG] Self Freeing In the case of a form override OnClose and set Action to caFree;.   procedure TMyForm.FormClose(Sender: TObject; var Action: TCloseAction); begin   Action := caFree; end;   Stacey -----Original Message----- From: Paul Mckenzie [mailto:[EMAIL PROTECTED] Sent: Thursday, 18 March 2004 16:23 To: NZ Borland Developers Group - Delphi List Subject: Re: [DUG] Self Freeing But I want to self Free - ie immediately after executing its event it frees itself (eg OnClick).   Regards Paul McKenzie Analyst Programmer SMSS Ltd.   ----- Original Message ----- From: Stacey Verner To: NZ Borland Developers Group - Delphi List Sent: Thursday, March 18, 2004 4:07 PM Subject: RE: [DUG] Self Freeing Explicitly free it when you are done with it (maby add it to a list?) or set its owner to something valid so when the owner component is freed the dynamically created component will also be freed.   Stacey -----Original Message----- From: Paul Mckenzie [mailto:[EMAIL PROTECTED] Sent: Thursday, 18 March 2004 15:55 To: Delphi List - Delphi Subject: [DUG] Self Freeing What is the best way for a dynamically created component to free itself ?     Regards Paul McKenzie Analyst Programmer SMSS Ltd.   _______________________________________________ Delphi mailing list [EMAIL PROTECTED] http://ns3.123.co.nz/mailman/listinfo/delphi ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ This communication contains information that is confidential and the copyright of ensynergy Limited or a third party. 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