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
Solved

How to determin which component triggered an event?

Posted on 2002-04-05
3
192 Views
Last Modified: 2010-04-02
I am working on my first windows project in Borland C++ and I can't seem to figure this out:

I need to have an array of components, or some way of quickly stepping through each one so I can duplicate the values, I chose an array.

I define my componenets:

TCheckBox ListBox[MAX_ITEMS];
 
for (count=0;count<MAX_ITEMS;count++) {
     ListBox[count] = new TCheckBox(this);
     ListBox[count].Top = 35;
     ListBox[count].Tag = count;
     // other properties and stuff ...
     ListBox[count].OnClick = &EntryDuplicate;
}

My question is how can I access the properties of the
TCheckBox componenet that triggered the event from the event?

Thanks in advance.
0
Comment
Question by:philtwo
  • 2
3 Comments
 
LVL 6

Accepted Solution

by:
thienpnguyen earned 300 total points
ID: 6921443
void __fastcall TForm1::EntryDuplicate(TObject *Sender)
{
    // assume, you click on your TListBox
    TListBox *listbox = (TListBox *) Sender;
    listbox->Top = 10;
    //....

}
0
 
LVL 6

Expert Comment

by:thienpnguyen
ID: 6921461
Other way,

void __fastcall TForm1::EntryDuplicate(TObject *Sender)
{
   TListBox *listbox = dynamic_cast<TListBox*>( Sender );
   if( listbox != NULL )
   {
       listbox->Top = 10;
        //....
   }

}
0
 

Author Comment

by:philtwo
ID: 6921921
Asbolute life saver - thanks alot!!
0

Featured Post

Announcing the Most Valuable Experts of 2016

MVEs are more concerned with the satisfaction of those they help than with the considerable points they can earn. They are the types of people you feel privileged to call colleagues. Join us in honoring this amazing group of Experts.

Question has a verified solution.

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

Suggested Solutions

Title # Comments Views Activity
Best book to learn C++ 4 83
Using Diagnostic tools in VS2015: Unresoved allocations 19 102
Create a path if not exists 7 87
Error C2678: binary '!=': no operator found... 4 57
When writing generic code, using template meta-programming techniques, it is sometimes useful to know if a type is convertible to another type. A good example of when this might be is if you are writing diagnostic instrumentation for code to generat…
Written by John Humphreys C++ Threading and the POSIX Library This article will cover the basic information that you need to know in order to make use of the POSIX threading library available for C and C++ on UNIX and most Linux systems.   [s…
The goal of the video will be to teach the user the concept of local variables and scope. An example of a locally defined variable will be given as well as an explanation of what scope is in C++. The local variable and concept of scope will be relat…
The viewer will learn how to use the return statement in functions in C++. The video will also teach the user how to pass data to a function and have the function return data back for further processing.

792 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