Want to protect your cyber security and still get fast solutions? Ask a secure question today.Go Premium

x
?
Solved

Data Structures | Follow Up

Posted on 2004-08-01
1
Medium Priority
?
212 Views
Last Modified: 2010-04-05
Q is follow up of http:Q_21077801.html

Detailing a bit of Dynamic Arrays and how to get the size of them plus some tips and tricks...
0
Comment
Question by:Cerf
1 Comment
 
LVL 35

Accepted Solution

by:
Slick812 earned 1000 total points
ID: 11690698
I will guess that you need the sizeOf for some kind of memory copy of array data?
if you have used fixed arrays you can get the array Data by the array variable's pointer address

var
aryFixed: TPMem51;

begin
CopyMemoy(@aryFixed, pPointer, SizeOf(aryFixed));
 - - - - - - - - -

but this will NOT work with dynamic arrays because the variable is jus a pointer to a delphi reference that handles the dynamic array, to use a pointer location for a dynamic arrat, I use the address of the first element

var
 _tData: Array of Word;

begin
// setlength and whatever
 pData := @_tData[0]; // first element of array for memory address od the array data


however, a SizeOf( ) for ANY TObject, or dynamic array (a String type is a dynamic array) it will ALWAYS return 4 , because these Objects and dynamic arrays are Pointers, because objects and dyn arrays are ReAllocated memory blocks,
0

Featured Post

Upgrade your Question Security!

Your question, your audience. Choose who sees your identity—and your question—with question security.

Question has a verified solution.

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

In this tutorial I will show you how to use the Windows Speech API in Delphi. I will only cover basic functions such as text to speech and controlling the speed of the speech. SAPI Installation First you need to install the SAPI type library, th…
Hello everybody This Article will show you how to validate number with TEdit control, What's the TEdit control? TEdit is a standard Windows edit control on a form, it allows to user to write, read and copy/paste single line of text. Usua…
this video summaries big data hadoop online training demo (http://onlineitguru.com/big-data-hadoop-online-training-placement.html) , and covers basics in big data hadoop .
Screencast - Getting to Know the Pipeline
Suggested Courses

572 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