(Delphi ActiveX) Unzip Encrypted Text into a String Variable

Demonstrates how to open an encrypted .zip archive and unzip a text file directly into a string variable.

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

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
zip: TChilkatZip;
success: Integer;
entry: IChilkatZipEntry;
lineEndingBehavior: Integer;
srcCharset: WideString;
strCsv: WideString;

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

zip := TChilkatZip.Create(Self);

// Set the password required for decrypting.
zip.DecryptPassword := 'myPassword';

success := zip.OpenZip('encrypted.zip');
if (success <> 1) then
  begin
    Memo1.Lines.Add(zip.LastErrorText);
    Exit;
  end;

// Locate the file within the Zip to be unzipped into a string variable:
entry := zip.FirstMatchingEntry('*.csv');
if (zip.LastMethodSuccess = 0) then
  begin
    Memo1.Lines.Add('No matching entry found.');
    Exit;
  end;

// lineEndingBehavior:
// 0 = leave unchanged.
// 1 = convert all to bare LF's
// 2 = convert all to CRLF's
lineEndingBehavior := 0;
srcCharset := 'utf-8';

strCsv := entry.UnzipToString(lineEndingBehavior,srcCharset);
Memo1.Lines.Add(strCsv);
end;