[DUG] basic question

[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.
> 
> Take a look at the TMethod class to see how this
> works and can be used successfully
> to redirect code and data.
> 
> The code pointer is share by all instances of the
> object and exists even if the
> object has not been created (just declared).  The
> converse is that each object
> instance has its own data pointer which is not
> initialised until the object is
> created by the constructor.
> 
> To see this in action, change your execute method to
> access a property/field of
> FormB.  Boom !
> 
> Compiler magic - we love it !
> 
> 
> D
> 
> 
> On Wed, 25 Jul 2007 08:28:03 +0530, you wrote:
> 
> >Hi,
> >
> >Is it possible to call a method of a class without
> creating a object of it,
> >even if the method is not a class function in
> Delphi ? I wrote the below
> >code just to test -
> >
> >1. Created a simple form A and a button on it.
> >2. Created another simple form B, written a
> procedure in it as -
> >    FormB.Execute;
> >    begin
> >      ShowMessage("xyz");
> >    end;
> >3. Commented out auto creation of FormB in
> application.
> >4. On Button Click in FormA I called the Execute of
> FormB and it worked
> >perfectly okay.
> >
> >What could be the reason for this? I had the idea
> that either I need to
> >create an object before calling any method or I
> need to declare a class
> >function.
> >
> >In the above steps when I am trying to call Show in
> Execute function of Form
> >B I got Access violation which is perfectly fine
> according to the above
> >statement.
> >
> >May be I am missing something simple here, but any
> pointers will be great.
> >This was done in D2005 and it's win32 app.
> >
> >Thanks
> >-Ani
> 
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Edward Koryagin

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