Solved

Instance form when needs

Posted on 2001-07-22
1
129 Views
Last Modified: 2010-04-06
I had write a big application which having two hundreds  form. It's not a good idea that instance them when application run. So,I save their name in a ListBox, but how to instance a form when it's name in listbox clicked?
0
Comment
Question by:firstshine
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
1 Comment
 
LVL 17

Accepted Solution

by:
inthe earned 66 total points
ID: 6306447
hi,
you will need to add the units to your uses section and call registerclass with the form class names .
below is rough example ,you may want to save the s and check if its already exists or not..

{note the listbox contains:
TForm2
TForm3
TForm4
        }

implementation

{$R *.DFM}
uses unit2,unit3,unit4;

procedure TForm1.ListBox1Click(Sender: TObject);
var
i : integer;
s : string;
f : TForm;
c : TPersistentClass;
begin
registerClasses([TForm2,TForm3,TForm4]);
i := listbox1.ItemIndex;
s := listbox1.Items.Strings[i];
c := GetClass(s);
if c <> nil then begin
//here you may want to use a stringlist etc to
//check if s is being used currently
//
f := TComponentClass(c).Create(self) as TForm;
f.Show;
end;
end;
0

Featured Post

Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

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

Suggested Solutions

Hello everybody This Article will show you how to validate number with TEdit control, What's the TEdit control? TEdit is a standard Windows edit control on a form, it allows to user to write, read and copy/paste single line of text. Usua…
Introduction Raise your hands if you were as upset with FireMonkey as I was when I discovered that there was no TListview.  I use TListView in almost all of my applications I've written, and I was not going to compromise by resorting to TStringGrid…
Exchange organizations may use the Journaling Agent of the Transport Service to archive messages going through Exchange. However, if the Transport Service is integrated with some email content management application (such as an antispam), the admini…

739 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