Ani
What you are referring to is a "Class Method" and no Delphi does not
have them (though other OO languages do)
it also does not have class variables (hence there is not need for Class
Methods is the logic I presume)
The reason your code works is that the method you called makes no
reference to the instance of FormB only to the method
of class FormB (and ShowMessage is a non OO procedure), in compiled code
there always on instance of the code base (and data
for the Object instances) so i assume that you called "Execute" in the
class method table in the context of a nil instance
If you had done
procedure TFormB.Execute;
begin
ShowMessage(self.Caption); // AV Here
end;
I'm sure this is all wrong and Max or Paul will correct me
Cheers
Neven
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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