[2 days left] What’s wrong with your cloud strategy? Learn why multicloud solutions matter with Nimble Storage.Register Now

x
?
Solved

Addressing controls created at runtime

Posted on 1998-08-28
7
Medium Priority
?
145 Views
Last Modified: 2012-05-04
Hi,

I am creating a number of controls on a form at runtime. I am storing pointers to these controls in a TList on creation.

How do I use the entries in TList to access the properties and methods of the control or do I even need to do this to access the properties of the controls?

Thanks
0
Comment
Question by:ChrisBerry
[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
  • 3
  • 2
  • 2
7 Comments
 
LVL 7

Expert Comment

by:BlackMan
ID: 1337994
You need to typecast them, like TButton(MyList[1]).Caption. That also means that you need to know what type the objects are, otherwise you can typecast them to the lowest common object and use the properties defined on that object (f.ex. TComponent)
0
 

Author Comment

by:ChrisBerry
ID: 1337995
Thanks, just what I wanted.

Just one thing - why when a property/event like OnMouse... is declared in the heirarchy at the TObject or TWinObject (I forget which) can I only access it at the, say, TEdit level?

Please lock the question so I can hand you the points.

Regards

Chris

0
 

Expert Comment

by:chrismo
ID: 1337996
To your second question - because the lower level components publish these properties that were previously declared public or protected...
0
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!

 

Expert Comment

by:chrismo
ID: 1337997
To your second question - because the lower level components publish these properties that were previously declared public or protected...
0
 

Author Comment

by:ChrisBerry
ID: 1337998
Thanks chrismo,

I wish to reject your answer because BlackMan gave the main answer I was looking for. If he does not lock within the next day or so please feel free to lock again and I will pass the points to you.


0
 
LVL 7

Accepted Solution

by:
BlackMan earned 200 total points
ID: 1337999
You need to typecast them, like TButton(MyList[1]).Caption. That also means that you need to know what type the objects are, otherwise you can typecast them to the lowest common object and use the properties defined on that object (f.ex. TComponent)
0
 

Expert Comment

by:chrismo
ID: 1338000
No problem - I didn't realized I posted twice - I meant to just post a comment as I knew I wasn't answering the main question.
0

Featured Post

[Webinar] Lessons on Recovering from Petya

Skyport is working hard to help customers recover from recent attacks, like the Petya worm. This work has brought to light some important lessons. New malware attacks like this can take down your entire environment. Learn from others mistakes on how to prevent Petya like worms.

Question has a verified solution.

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

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…
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…
Sometimes it takes a new vantage point, apart from our everyday security practices, to truly see our Active Directory (AD) vulnerabilities. We get used to implementing the same techniques and checking the same areas for a breach. This pattern can re…
In response to a need for security and privacy, and to continue fostering an environment members can turn to for support, solutions, and education, Experts Exchange has created anonymous question capabilities. This new feature is available to our Pr…
Suggested Courses

656 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