(Delphi DLL) Ungzip Base64 String

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.

Chilkat for Delphi Downloads Chilkat non-ActiveX DLL for Delphi Chilkat ActiveX DLL for Delphi * The examples here use the non-ActiveX DLL.

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

...

procedure TForm1.Button1Click(Sender: TObject);
var
gzip: HCkGzip;
gzipBase64: PWideChar;
bd: HCkBinData;
success: Boolean;
strXml: PWideChar;

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

gzip := CkGzip_Create();

gzipBase64 := 'H4sIAAAAAAAE ... X6aZjXO3EwAA';

bd := CkBinData_Create();
success := CkBinData_AppendEncoded(bd,gzipBase64,'base64');

success := CkGzip_UncompressBd(gzip,bd);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkGzip__lastErrorText(gzip));
    Exit;
  end;

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

CkGzip_Dispose(gzip);
CkBinData_Dispose(bd);

end;