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7.4

Funniness with dynamic arrays

Asked by davelane in Delphi Programming

Tags: dynamic, array

OK have the following data types:
  TFeatureType = (ftPoint, ftLine, ftArea, ftCompound, ftUnknown);
  TFeatureEntry = record
    OriginalPermanentID: string;
    OutPermanentID: string;
    FeatureType: TFeatureType;
    FeatureTable: string;
  end;
  TFeatureEntryArray = array of TFeatureEntry;
  TFeatureMapEntry = record
    FeatureID: String;
    Features: TFeatureEntryArray;
  end;
  TFeatureMapArray = array of TFeatureMapEntry;

Have a problem that when I assign large amounts of data dynamically to a variable of type TFeatureMapArray, the program eats up my memory pretty quick. I have distilled down the problem to the following code snippet (Map is of type TFeatureMapArray).
  for i := 0 to 100000 do
  begin
    SetLength(Map, i + 1);
    Map[i].FeatureID := '12345678';
    SetLength(Map[i].Features, 1);
    Map[i].Features[0].OriginalPermanentID := '23456789';
    Map[i].Features[0].OutPermanentID := '34567890';
    Map[i].Features[0].FeatureType := ftPoint;
    Map[i].Features[0].FeatureTable := '45678901';
  end;

Anyone have any ideas why? What can I do to stop this?
[+][-]09/24/03 09:28 AM, ID: 9422079Author Comment

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[+][-]09/24/03 09:39 AM, ID: 9422171Expert Comment

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[+][-]09/24/03 10:33 AM, ID: 9422593Accepted Solution

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About this solution

Zone: Delphi Programming
Tags: dynamic, array
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Solution Provided By: gary_williams
Participating Experts: 5
Solution Grade: A
 
[+][-]09/24/03 06:04 PM, ID: 9425194Expert Comment

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[+][-]09/26/03 04:29 PM, ID: 9440223Expert Comment

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[+][-]10/01/03 08:30 AM, ID: 9467517Expert Comment

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