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dynamic array

Posted on 2002-04-27
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Last Modified: 2010-05-18
How can I create a dynamic array (from variant ?) of a user defined record ?

Andrew
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Question by:andrewyu
10 Comments
 
LVL 27

Expert Comment

by:kretzschmar
ID: 6972947
type
  TRecord = record
              ....
            end;
  TRecArray : Array of TRecord;

var
  ARecArray : TRecArray;

...

     
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Author Comment

by:andrewyu
ID: 6972949
How can I resize or define dimension of ARecArray ?

Andrew
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LVL 22

Expert Comment

by:Mohammed Nasman
ID: 6972991
 SetLength(MyArr,100);
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Author Comment

by:andrewyu
ID: 6973396
Therefore, I can access the array from MyArr[0] to MyArr[99].

However, how can I create a multi-dimension array with SetLength ?

Andrew
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LVL 25

Accepted Solution

by:
Tomas Helgi Johannsson earned 100 total points
ID: 6973488
   Hi!

Add the following to the type declartion :
     TMRecArray = Array of TRecArray;

The variable should be
ARecArray : TMRecArray;

Then to initialize the multidimenisionalarray
like this

procedure TForm1.FormCreate(Sender: TObject);
var
   i,j,max : Integer;
begin
     max := 100
     SetLength(ARecArray,max);
     for j := 0 to max-1 do
     begin
          SetLength(ARecArray[j],max);
     end;
     for i := 0 to max-1 do
         for j := 0 to max-1 do
           ARecArray[i][j].<record field name> := <what ever>;
end;

This example is a 100x100 matrix. If you want to add a dimmension to your array then you just add in the type declaration <a new name of array type> : <the last name of array type> and so on. And the variable to the new name of the array type.
Then in the initalization you should add some code like this

procedure TForm1.FormCreate(Sender: TObject);
var
   i,j...,z,max : Integer;
begin
     max := 100
     SetLength(ARecArray,max);
     for j := 0 to max-1 do
     begin
          SetLength(ARecArray[j],max);
          for k := 0 to max-1 do
          begin
              SetLength(ARecArray[j][k],max);
              for ...
              begin
                  SetLength(ARecArray[j][k]....,max);
              end
          end;
     end;
end;
 
The for loops for each additional dimmension should be like the for k:= - loop.

Just remember to free the memory :)

Regards,
Tomas Helgi
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LVL 1

Expert Comment

by:Moondancer
ID: 6973847
Have you been helped here, or is more needed?
Moondancer - EE Moderator
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Author Comment

by:andrewyu
ID: 6974397
Thank you very much !

Andrew
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LVL 1

Expert Comment

by:Moondancer
ID: 6974821
Thank you, Andrew, for returning and finalizing this.
Moondancer - EE Moderator
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