RE: [DUG] Self Freeing

Thu, 18 Mar 2004 13:13:39 -0800

Title: Message
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 -----
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 -----
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.
 

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