[SOLVED]how to use a variable as a part of a programming code?

[questionstoaskislot]

Hi another question (my name really suites me )

I need to know can we use a variable lets call it a integer variable as a part of a code
Something like this

Lable(a).caption=a;
{Its a lazarus project}

In here a means a variable integer
How to use that like that is there a way
================================

My second (some kind of a same looking) question

Can we use a string as a part of a programming code
Ex:-
      b:='lable'+(inttostr(a))+'.caption';
      (b):=c;
{C,a are integer}
{b is a string}

Here it doesnt work all happen is just b get = to c

Answer with example code or with a web link which can be understand easily as i was not a pro pascal programmer still, please

[Handoko]

This is not valid in Pascal:
Lable(a).caption=a;

This is valid in Pascal, but not the way you was thinking:
b:='lable'+(inttostr(a))+'.caption';

This is not valid in Pascal:
(b):=c;

[questionstoaskislot]

Ok i get it
And i get that lable was wrong and it should be label

But the thing is I don't want to check whether that my code was not right or wrong.I need to know how to do it , please

[taazz]

There are no component arrays like the vb control arrays in lazarus. There are a couple of ways to accomplish a generic property assignment but they all have a speed penalty. For example

Code: Pascal  [Select][+][-]

1. Function Tform1.SetLabelCaption(const aLabelName, aCaption:String);
2. var
3.   vCmp:TComponent;
4. begin
5.   vCmp := FindComponent(aLabelName);
6.   if assigned(vCm) and (vCmp is TLabel) then TLabel(vCmp).Caption := aCaption Else raise Exception.create('Invalid label name '+aLabelName+'.');
7. end;
8.  

and there is the runtime type information you can use to change any published property to any thing you want as long as you know the property name and have a valid value for it but I wouldn't use it on daily bases my self.

[questionstoaskislot]

Good point but the thing is I don't know the property name correctly
It gonna be something  gave by user any other way..

[taazz]

why would a user know anything about your properties? What are you writing?

[questionstoaskislot]

This is what i am writing

[questionstoaskislot]

Hey there is a way
We can use that
U are right taazz
See this

Var
   Vcmp:Tcomponent;
   Labelname:string;
Begin
   Labelname:=edit1.text;
   Vcmp:=FindComponent(labelname);
°°°°°

It work
Wooo hooo

[taazz]

This is what i am writing

sorry dude you have to do a lot better than that. Have fun.

[Handoko]

@questionstoaskislot

Exposing control's properties to users is not a good idea, it may have security issue. You maybe don't understand now, you will know it in the future.

[questionstoaskislot]

Oh no no nooo
User never get to know the properties
It was just a example thing
You will get to know what i was doing soon very soon