Solved

Name of form and panel the same?

Posted on 2002-03-12
5
150 Views
Last Modified: 2010-04-05
Hi
Delphi allows you to put a panel on a form and change its name to Form1. This generates a lot of problems because now the compiler does not know whether I am refering to the panel or the form. Is this a bug? If not how do I specify which object I am accessing. I am using D5Ent.
Doing a Form1:=Nil causes a lot of strange problems.

Groete
Gerhardus
0
Comment
Question by:flooder
  • 2
  • 2
5 Comments
 
LVL 7

Accepted Solution

by:
Motaz earned 50 total points
ID: 6855959
inside events you can use this:

Form1.Caption:= 'Hi'; // This will affect Panel caption

Self.Caption:= 'Hi'; // This will affect Form caption

Outside form:

Form1 means the form
Form1.Form1 means the panel

why did u need Form1:= nil??

Motaz
0
 

Expert Comment

by:gooder
ID: 6856004
Form1 is the instance of the form you create, when there is no object named 'form1' also;
If any, the way to access this form is to call 'Self' but not 'Form1' . And 'Form1' now is referenced to the object having this name.
                           so?
0
 
LVL 1

Author Comment

by:flooder
ID: 6856007
I create my forms runtime and when I free them I set them to nil.

Groete
Gerhardus
0
 
LVL 7

Expert Comment

by:Motaz
ID: 6856025
how did you create forms at run-time?

if you assign an owner to your created forms, then you cann't free them manually, instead the owner will free them which this owner is freed, so that if the owner attempt to free already freed forms, access violation will occure.

Another solution is to set nill to the owner of your forms such as:

var
  Form: TForm;
begin
  Form:= TForm.Create(nil);
  Form.Show;
 ....
  Form.Free;
  Form:= nil;
end;

Motaz
0
 
LVL 1

Author Comment

by:flooder
ID: 6856061
if not assigned(myform) then
  myform:=tmyform.create(nil)
myform.show or myform.showmodal

events for myform
onclose
  Action:=cafree;
ondestroy
  myform:=nil;

This is in short how I do this

Groete
Gerhardus
0

Featured Post

Does Powershell have you tied up in knots?

Managing Active Directory does not always have to be complicated.  If you are spending more time trying instead of doing, then it's time to look at something else. For nearly 20 years, AD admins around the world have used one tool for day-to-day AD management: Hyena. Discover why

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
add combobox item based on numbers 9 143
code issue 8 131
How to renew a Delphi rad-studio licence? 5 65
Unique identifier on a terminal server (rdp) 4 54
Introduction The parallel port is a very commonly known port, it was widely used to connect a printer to the PC, if you look at the back of your computer, for those who don't have newer computers, there will be a port with 25 pins and a small print…
In my programming career I have only very rarely run into situations where operator overloading would be of any use in my work.  Normally those situations involved math with either overly large numbers (hundreds of thousands of digits or accuracy re…
Email security requires an ever evolving service that stays up to date with counter-evolving threats. The Email Laundry perform Research and Development to ensure their email security service evolves faster than cyber criminals. We apply our Threat…
A short tutorial showing how to set up an email signature in Outlook on the Web (previously known as OWA). For free email signatures designs, visit https://www.mail-signatures.com/articles/signature-templates/?sts=6651 If you want to manage em…

809 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question