Delphi ActiveX

Ungzip Base64 String

See more Gzip Examples

Suppose you have a gzip in base64 representation that contains a text file, such as XML. This example shows how to decompress and access the string. 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
success: Integer;
gzip: TChilkatGzip;
gzipBase64: WideString;
bd: TChilkatBinData;
strXml: WideString;

begin
success := 0;

// This example assumes the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

gzip := TChilkatGzip.Create(Self);

gzipBase64 := 'H4sIAAAAAAAE ... X6aZjXO3EwAA';

bd := TChilkatBinData.Create(Self);
success := bd.AppendEncoded(gzipBase64,'base64');

success := gzip.UncompressBd(bd.ControlInterface);
if (success <> 1) then
  begin
    Memo1.Lines.Add(gzip.LastErrorText);
    Exit;
  end;

strXml := bd.GetString('utf-8');
Memo1.Lines.Add('XML:');
Memo1.Lines.Add(strXml);
end;