[DUG] basic question

[Conor Boyd]

Probably. ;-)

Which is why I clarified my original statement.

Cheers,

C.

P.S. I've been doing Delphi dev on and off since Delphi 1, so I do
understand the difference between the cases where I do and don't have
code in a method referring to instance properties as opposed to just a
simple ShowMessage... ;-) 

-----Original Message-----
From: delphi-bounces at delphi.org.nz [mailto:delphi-bounces at delphi.org.nz]
On Behalf Of Edward Koryagin

;) May be we are talking about different things?

In your case you were probably tricked by Delphi (optimizer??)...

Yes, if you have just ShowMessage in your method everything will be
fine. But ... did you try to assign value to some local variable? You
will have AV cause we don't have the object of the class.

--- Conor Boyd <Conor.Boyd at trimble.co.nz> wrote:

> I'll say it again: no you won't. ;-)
> 
> I'll clarify my posting for you.
> 
> If you tried what the original poster said (I'm using D2006), and 
> recreated it (i.e. create two forms, make the second one not 
> autocreated, add a method to the second form with a simple ShowMessage

> in it, and call that method on the object reference for the form), you

> will definitely not get an AV.
> 
> Using the references in your line below, you can happily invoke a 
> method on your FormB variable with no AVs - if, as Myles said, there 
> is no code in that method that refers to instance properties, fields, 
> etc.
> 
> E.g.
> In your project source the following will (maybe
> surprisingly) not AV:
> begin
> 	Application.Initialise;
> 	Application.CreateForm(TFormA, FormA);
> 	FormB.SomeMethodThatOnlyCallsShowMessage;
> 	Application.Run;
> end;
> 
> Maybe the compiler has inlined it or something, I don't know.
> 
> C.
> 
> -----Original Message-----
> From: delphi-bounces at delphi.org.nz
> [mailto:delphi-bounces at delphi.org.nz]
> On Behalf Of Edward Koryagin
> 
> Yes I do ;)
> 
> if you don't have
>   Application.CreateForm(TFormB, FormB); in your project source you 
> will have AV
> 
> --- Conor Boyd <Conor.Boyd at trimble.co.nz> wrote:
> 
> > No you don't. ;-)
> > 
> > Try it.
> > 
> > C. 
> > 
> > -----Original Message-----
> > From: delphi-bounces at delphi.org.nz
> > [mailto:delphi-bounces at delphi.org.nz]
> > On Behalf Of Edward Koryagin
> > 
> > Remove FormB from AutoCreate list and you will
> have
> > AV.
> > 
> > --- David Moorhouse <delphi at moorhouse.net.nz>
> wrote:
> > 
> > > The Delphi compiler creates an implicit
> parameter
> > to Self and places
> > > it before the other params to the method.
> 
> _______________________________________________
> NZ Borland Developers Group - Delphi mailing list
> Post: delphi at delphi.org.nz
> Admin: http://delphi.org.nz/mailman/listinfo/delphi
> Unsubscribe: send an email to
> delphi-request at delphi.org.nz with Subject:
> unsubscribe
> 


Edward Koryagin

Send instant messages to your online friends
http://au.messenger.yahoo.com
_______________________________________________
NZ Borland Developers Group - Delphi mailing list
Post: delphi at delphi.org.nz
Admin: http://delphi.org.nz/mailman/listinfo/delphi
Unsubscribe: send an email to delphi-request at delphi.org.nz with Subject:
unsubscribe