Delphi ActiveX

Serialize / Deserialize Hashtable to/from XML

Demonstrates how to seralize / deserialize a Hashtable to/from XML.

Note: This example requires Chilkat v9.5.0.64 or later.

Delphi ActiveX

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Chilkat_TLB;

...

procedure TForm1.Button1Click(Sender: TObject);
var
hashTab: TChilkatHashtable;
sb: TChilkatStringBuilder;
hashTab2: TChilkatHashtable;
sTable: TChilkatStringTable;
i: Integer;
numKeys: Integer;
key: WideString;

begin
// Note: This example requires Chilkat v9.5.0.64 or later.

// Add some entries to a hashtable.
hashTab := TChilkatHashtable.Create(Self);

hashTab.AddStr('aaa','111');
hashTab.AddStr('bbb','222');
hashTab.AddStr('ccc','333');

// Serialize to XML
sb := TChilkatStringBuilder.Create(Self);
hashTab.ToXmlSb(sb.ControlInterface);
Memo1.Lines.Add(sb.GetAsString());
Memo1.Lines.Add('---');

// The output is as follows.  Each hash table entry
// is contained in an "e" node.  The entry's key
// is in the "k" node, and the value in the "v" node.

// <?xml version="1.0" encoding="utf8-8"?>
// <hashtable>
// <e><k>aaa</k><v>111</v></e>
// <e><k>bbb</k><v>222</v></e>
// <e><k>ccc</k><v>333</v></e>
// </hashtable>
// 

// Now load (deserialize) into a new hash table.
hashTab2 := TChilkatHashtable.Create(Self);
hashTab2.AddFromXmlSb(sb.ControlInterface);

// Get the hash table keys, and lookup each (to show 
// that the hash table was correctly deserialized).
// The GetKeys method can return the keys in any order.
sTable := TChilkatStringTable.Create(Self);
hashTab2.GetKeys(sTable.ControlInterface);

i := 0;
numKeys := sTable.Count;
while i < numKeys do
  begin
    key := sTable.StringAt(i);
    Memo1.Lines.Add(key + ': ' + hashTab2.LookupStr(key));
    i := i + 1;
  end;
end;