Want to win a PS4? Go Premium and enter to win our High-Tech Treats giveaway. Enter to Win

x
?
Solved

Something like a eval('oblect'+1).whatever ???????

Posted on 2003-12-08
3
Medium Priority
?
214 Views
Last Modified: 2011-09-20
okie.... supose u have 10 text boxies and i named them like box1, box2, box3..... now i want to make a do while or something..

and i want to call all those 10 boxies in this do while but of corse just using one single call.


In ActionScript there is a function named eval that does that:
counter = 0
same = 0
while counter < 11 do
{
   counter++
   if eval('box'+counter).text == 'lala'
   {
      same++
   }
}

Well there ar any possible to make it in Delphi ?

Thanks in advance :)
0
Comment
Question by:furmiga
[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 Comments
 
LVL 27

Expert Comment

by:kretzschmar
ID: 9899969
look at the findcomponent-method

just as hint, no time yet

meikl ;-)
0
 
LVL 26

Accepted Solution

by:
Russell Libby earned 500 total points
ID: 9900184

Perhaps something like...

function Eval(Name: String): TComponent;

  function _Eval(Component: TComponent; Name: String): TComponent;
  var   dwIndex:       Integer;
  begin

     // Set default result
     result:=nil;

     // Check direct component children
     if Assigned(Component.FindComponent(Name)) then
        // Found the component
        result:=Component.FindComponent(Name)
     else
     begin
        // Check the children's children
        for dwIndex:=0 to Pred(Component.ComponentCount) do
        begin
           result:=_Eval(Component.Components[dwIndex], Name);
           if Assigned(result) then break;
        end;
     end;
  end;

begin

  // Start at the application level
  result:=_Eval(Application, Name);

end;

This would allow you to do:

procedure TForm1.Button1Click(Sender: TObject);
var  counter:    Integer;
     same:       Integer;
begin

  counter:=0;
  same:=0;

  while (counter < 11) do
  begin
     Inc(counter);
     if TEdit(Eval('Edit'+IntToStr(counter))).Text = 'lala' then
     begin
        Inc(same);
     end;
  end;

  ShowMessage(IntToStr(same));

end;


The only drawback to this is that you have to cast the result of Eval(...) to the expected component type, like TEdit, TButton, TLabel, etc..., because the function returns a TComponent (or nil).
Note though, you can also use the "as" operator to cast, or use the "is" operator to perform dynamic checking. Using the "with" statement could also make coding a little simpler:

eg:

if (Eval('Edit'+IntToStr(counter)) as TEdit).Text = 'lala' then...
~or~
if Eval('Edit'+IntToStr(counter)) is TEdit then...
~or~

with Eval('Edit'+IntToStr(counter)) as TEdit do
begin
  if (Text = 'lala') then Inc(same);
end;


Hope this helps,
Russell


0
 
LVL 7

Author Comment

by:furmiga
ID: 9900336
ty a lot man that solved my problem :)
0

Featured Post

VIDEO: THE CONCERTO CLOUD FOR HEALTHCARE

Modern healthcare requires a modern cloud. View this brief video to understand how the Concerto Cloud for Healthcare can help your organization.

Question has a verified solution.

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

The uses clause is one of those things that just tends to grow and grow. Most of the time this is in the main form, as it's from this form that all others are called. If you have a big application (including many forms), the uses clause in the in…
Objective: - This article will help user in how to convert their numeric value become words. How to use 1. You can copy this code in your Unit as function 2. than you can perform your function by type this code The Code   (CODE) The Im…
In this video you will find out how to export Office 365 mailboxes using the built in eDiscovery tool. Bear in mind that although this method might be useful in some cases, using PST files as Office 365 backup is troublesome in a long run (more on t…
Is your data getting by on basic protection measures? In today’s climate of debilitating malware and ransomware—like WannaCry—that may not be enough. You need to establish more than basics, like a recovery plan that protects both data and endpoints.…
Suggested Courses

604 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