Solved

How can i detect that a form is al created

Posted on 1998-01-29
1
121 Views
Last Modified: 2010-04-04
In a MDI application i want to detect that a mdi child is
already created.
0
Comment
Question by:gipa
1 Comment
 
LVL 8

Accepted Solution

by:
ZifNab earned 100 total points
ID: 1357848
Iterate through the MDI childs and check the name.

To limit to only one mdi child, you can use this code
(from uddf)

 ChildIndex := 0
  while (ChildIndex < frmMDIParent.ChildCount) and
          (frmMDIParent.MDIChildren[ChildIndex].Name <> frmNewChild.Name) do
    Inc(ChildIndex);
  if ChildIndex = frmMDIParent.ChildCount then
    {create new child here}
    begin
       Create it...
       if no exception occurred, then show it...
    end
  else
    {child form already exists so just bring it to the top}
    frmMDIParent.MDIChildren[ChildIndex].BringToFront;

or maybe this

How about,



        if Form1 <> nil then
        begin
                Form1 := TForm1.Create(Application);
                Form1.Show;
        end;



Then in Form1's OnClose:



        Action := caFree;
        Form1    := nil;


0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

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

Suggested Solutions

Have you ever had your Delphi form/application just hanging while waiting for data to load? This is the article to read if you want to learn some things about adding threads for data loading in the background. First, I'll setup a general applica…
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…
Internet Business Fax to Email Made Easy - With eFax Corporate (http://www.enterprise.efax.com), you'll receive a dedicated online fax number, which is used the same way as a typical analog fax number. You'll receive secure faxes in your email, fr…
Hi friends,  in this video  I'll show you how new windows 10 user can learn the using of windows 10. Thank you.

863 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

Need Help in Real-Time?

Connect with top rated Experts

19 Experts available now in Live!

Get 1:1 Help Now