Record with string size

From: BedBaol (bedrosianbed_at_hotmail.com)
Date: 12/30/04 

Date: Thu, 30 Dec 2004 13:28:47 GMT

Hello.
How can I compute record size if Record contains string?
Say:

type
TMyRecord = record
      Number: integer;
      Logical : boolean;
      Text : string;
      end;
var
   MyRecord: TMyRecord;

I see that SizeOf(MyRecord) computes string size everytime equal to 4
(pointer size).
I don't want to fix sting part of record, because it changes very much at
runtime...
Thanks.

  BedBaol

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