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Declaring variables at runtim

Posted on 2002-07-04
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Last Modified: 2010-04-04
Is it possible to declare a variable at runtime ?

I want something like this :

procedure TForm1.SomeProc(Validated : Boolean);
begin
   if Validated then
   begin
      strList : TStringList;
      strList.Create(nil);
      // Do some stuff...
      strList.Free;
   end;
end;
0
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Question by:sruel
  • 5
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  • 2
  • +3
12 Comments
 
LVL 11

Accepted Solution

by:
robert_marquardt earned 25 total points
ID: 7129870
This is completely impossible for a compiled language.
Only a interpreted language can do that.

The above example does not need it.
strList is only a pointer. The object it points to IS created at runtime.
0
 
LVL 27

Expert Comment

by:kretzschmar
ID: 7129875
not possible,
except you've an inbuild-compiler

but why you want this,
why not easy

procedure TForm1.SomeProc(Validated : Boolean);
var strList : TStringList;
begin
  if Validated then
  begin
     strList.Create(nil);
     // Do some stuff...
     strList.Free;
  end;
end;

as you have to code the logic also

meikl ;-)
0
 
LVL 27

Expert Comment

by:kretzschmar
ID: 7129878
hi robert :-))
0
 
LVL 2

Expert Comment

by:lucika
ID: 7129881
procedure TForm1.SomeProc(Validated : Boolean);
begin
  if Validated then
  begin
     with TStringList.Create(nil) do
     begin
       // Do some stuff...
       Free;
     end;
  end;
end;
0
 
LVL 11

Expert Comment

by:robert_marquardt
ID: 7129905
kretschmar, lucika: TStringList.Create not TStringList.Create(nil). TStringList is no component.
Shame on you ;-)
0
 
LVL 27

Expert Comment

by:kretzschmar
ID: 7129917
>Shame on you ;-)
just copied

;-)
0
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LVL 3

Expert Comment

by:marcoszorrilla
ID: 7130091
Shame on What?
1. inthe: 504306 pts  
2. Madshi: 471558 pts  
3. kretzschmar: 422246 pts  

Best Regards.
Marcos.

0
 
LVL 27

Expert Comment

by:kretzschmar
ID: 7130259
atleast, robert is right,
the creator of the tstringlist has no parameter,
but i've just copied the given code

shame on me :-))

meikl ;-)
0
 

Author Comment

by:sruel
ID: 7130511
So, I should give the points to wich one of you ?
0
 
LVL 27

Expert Comment

by:kretzschmar
ID: 7130555
give it robert,
he was the first who pointed out,
that this is impossible

meikl ;-)
0
 
LVL 3

Expert Comment

by:SteveWaite
ID: 7130640
if you didn't know how many integers (say) you wanted then during run time a dynamic array of integers would suit nicely!

:-)
0
 

Author Comment

by:sruel
ID: 7131009
Ok, thanks to all of you folks !
0

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