I'm trying to check the ready state in an event handler
while loading some XML text into an IXMLDOMDocument like
this
FDocument := CoDOMDocument.Create;
FDocument.OnReadyStateChange := CheckReadyState;
FDocument.LoadXML(AText);
where CheckReadyState() is just a
procedure with no arguments.
but the OnReadyStateChange event is of type OleVariant in
the XML type library, so the compiler doesn't like it. Any
suggestions?
property onreadystatechange: OleVariant write
Set_onreadystatechange;
Thanks,
Todd
----- Original Message -----
Sent: Thursday, 6 March 2003
11:15
Subject: RE: [DUG]: [Q] Visual Form
Inheritance [VFI]
Donovan,
There is no reason why you can't create a normal
TForm and then convert it to being descended from one of your forms but
you do need to make an extra change to the dfm. If your form started life
as a normal TForm descendent then the first line of the dfm will be
"object"
ie
object MyNewForm: TMyNewForm
... etc
You need to change the word "object" to read
"inherited". So the new dfm should read:
inherited MyNewForm:
TMyNewForm
... etc
Without the inherited word delphi doesn't know to
stream in objects/properties from the parent form. Seems a little odd I
agree but you just have to play by the rules.
Hopefully that will help with your other
problems.
David.
BTW, the VFI which Myles is talking
about is slightly more advanced and involves having an expert
built into the VCL. It can be very powerful but if you are simply wanting
to inherit from forms in your project then you don't need to go to those
lengths.
G'Day,
I
have been using visual form inheritance for a project and have a couple
of
questions.
1. Why do I have to do a New... and select the
base form from the "MyProject" tab?
If I have a form declared as
TMyBaseForm and I do a New Form, why can't I just
change the
inhertited class in the new unit? ie
TMyNewForm = class(TForm)
becomes TMyNewForm = class(TMyBaseForm). If I do this
by hand then
"Revert To Inherited" is not available. So what else is Delphi
doing
behind the scenes?
2. A TImageList on the base form
does not update on the descendant child forms when
new images are
added. Why? Are certain controls not VFI supported?
3. Using
DevExpress Bars for my toolbar does not reflect on the descendant
children.
How are customised toolbars handled with VFI? Do children
have to drag their buttons
on?
What other gotchas are there
with VFI? Any comments, references etc.
appreciated.
--
Donovan
----------------------------------------------------------------------
Donovan J. Edye [www.edye.wattle.id.au]
Namadgi Systems [www.namsys.com.au]
Voice: +61 2 6285-3460
Fax: +61 2 6285-3459
TVisualBasic =
Class(None);
Heard just before the 'Big Bang': "...Uh Oh...."
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