Lazarus Pascal Requires Chilkat v11.0.0+

Iterate Over ZIP Entries Using EntryAt

This example demonstrates how to use the EntryAt method to iterate over all entries contained within a ZIP archive.

The EntryAt method retrieves a ZipEntry object for a given zero-based index.

This is useful for:

• Enumerating all entries in a ZIP archive
• Inspecting filenames, sizes, and timestamps
• Searching or filtering ZIP contents

Suppose the ZIP archive contains:

docs/readme.txt
images/logo.png
data/config.json

The example loops through all ZIP entries and prints information about each entry.

Lazarus Pascal

program ChilkatDemo;

// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.

{$IFDEF FPC}
  {$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}

uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  CkDllLoader,
  Chilkat.ZipEntry,
  Chilkat.Zip;

// ---------------------------------------------------------------------------

procedure RunDemo;
var
  success: Boolean;
  zip: TZip;
  numEntries: Integer;
  entry: TZipEntry;
  i: Integer;

begin
  success := False;

  //  Open an existing ZIP archive.
  zip := TZip.Create;

  success := zip.OpenZip('example.zip');
  if (success = False) then
    begin
      WriteLn(zip.LastErrorText);
      Exit;
    end;

  //  Get the total number of entries in the ZIP archive.
  numEntries := zip.NumEntries;

  WriteLn('Number of ZIP entries = ' + numEntries);

  //  Create a ZipEntry object that will be reused
  //  for each entry retrieved by EntryAt.
  entry := TZipEntry.Create;

  //  Iterate over all ZIP entries.
  i := 0;
  while i < numEntries do
    begin

      //  Retrieve the entry at index i.
      success := zip.EntryAt(i,entry);
      if (success = False) then
        begin
          WriteLn(zip.LastErrorText);
          Exit;
        end;

      WriteLn('Entry ' + i);
      WriteLn('  FileName: ' + entry.FileName);
      WriteLn('  Uncompressed Length: ' + entry.UncompressedLength);
      WriteLn('  Compressed Length: ' + entry.CompressedLength);
      WriteLn('');

      i := i + 1;
    end;

  //  Sample output:
  //  
  //  Entry 0
  //    FileName: docs/readme.txt
  //    Uncompressed Length: 1204
  //    Compressed Length: 512
  //  
  //  Entry 1
  //    FileName: images/logo.png
  //    Uncompressed Length: 84211
  //    Compressed Length: 84102
  //  

  zip.CloseZip();

  WriteLn('Done.');


  zip.Free;
  entry.Free;

end;

// ---------------------------------------------------------------------------

begin

  try
    RunDemo;
  except
    on E: Exception do
      WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
  end;

  WriteLn;
  {$IFDEF MSWINDOWS}
  WriteLn('Press Enter to exit...');
  ReadLn;
  {$ENDIF}
end.