(Delphi ActiveX) Extract a Single ZIP Entry While Preserving Its Stored Path

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This example demonstrates how to use the ZipEntry.Extract method to extract a single entry from a ZIP archive.

The example first creates a ZIP archive containing a text file. It then re-opens the ZIP, finds the entry, and extracts it to a base directory.

The Extract method uses the relative path stored within the ZIP entry. Any required subdirectories are created automatically beneath the specified base directory.

Note: This example requires Chilkat v11.0.0 or greater.

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
success: Integer;
zip: TChilkatZip;
zip2: TChilkatZip;
entry: TChilkatZipEntry;

begin
success := 0;

// ------------------------------------------------------------
// First create a sample ZIP archive containing a small text file.

zip := TChilkatZip.Create(Self);

success := zip.NewZip('c:/temp/sampleText.zip');
if (success = 0) then
  begin
    Memo1.Lines.Add(zip.LastErrorText);
    Exit;
  end;

// Add a small text file from memory.
success := zip.AddString('myApp/docs/hello.txt','Hello from a ZIP entry!','utf-8');
if (success = 0) then
  begin
    Memo1.Lines.Add(zip.LastErrorText);
    Exit;
  end;

// Write the ZIP archive to disk and close it.
success := zip.WriteZipAndClose();
if (success = 0) then
  begin
    Memo1.Lines.Add(zip.LastErrorText);
    Exit;
  end;

// ------------------------------------------------------------
// Now open the ZIP archive we just created.

zip2 := TChilkatZip.Create(Self);

success := zip2.OpenZip('c:/temp/sampleText.zip');
if (success = 0) then
  begin
    Memo1.Lines.Add(zip2.LastErrorText);
    Exit;
  end;

// Find the entry by its stored ZIP path.
entry := TChilkatZipEntry.Create(Self);

success := zip2.EntryOf('myApp/docs/hello.txt',entry.ControlInterface);

if (success = 0) then
  begin
    Memo1.Lines.Add('Entry not found.');
    Exit;
  end;

// Extract this single entry to the base directory:
// 
//     c:/temp/extracted
// 
// Because the entry's stored path is:
// 
//     myApp/docs/hello.txt
// 
// the file will be extracted to:
// 
//     qa_output/extracted/myApp/docs/hello.txt
// 
// The required subdirectories are created automatically.
success := entry.Extract('c:/temp/extracted');
if (success = 0) then
  begin
    Memo1.Lines.Add(entry.LastErrorText);
    Exit;
  end;

zip2.CloseZip();

Memo1.Lines.Add('Entry extracted successfully.');
end;