(Delphi DLL) Iterate Through ZIP Entries Using EntryAt and ZipEntry.GetNext

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This example demonstrates how to iterate through all entries in a ZIP archive using:

• Zip.EntryAt to obtain the first entry
• ZipEntry.GetNext to advance through the remaining entries

The example prints each ZIP entry's stored filename and whether the entry is a file or directory.

This approach is useful when sequentially processing ZIP entries without repeatedly calling EntryAt by index.

Suppose the ZIP archive contains:

docs/
docs/readme.txt
images/logo.png
hello.txt

The example iterates through each entry in the order stored within the ZIP archive.

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, ZipEntry, Zip;

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Boolean;
zip: HCkZip;
entry: HCkZipEntry;

begin
success := False;

zip := CkZip_Create();

// Open an existing ZIP archive.
success := CkZip_OpenZip(zip,'c:/temp/example.zip');
if (success = False) then
  begin
    Memo1.Lines.Add(CkZip__lastErrorText(zip));
    Exit;
  end;

// A ZIP archive may contain zero entries.
if (CkZip_getNumEntries(zip) = 0) then
  begin

    Memo1.Lines.Add('The ZIP archive is empty.');

    CkZip_CloseZip(zip);
    Exit;
  end;

// ------------------------------------------------------------
// Get the first ZIP entry.
// 
// EntryAt(0,entry) initializes the ZipEntry object so that
// it represents the first entry in the ZIP archive.
// 
entry := CkZipEntry_Create();

success := CkZip_EntryAt(zip,0,entry);
if (success = False) then
  begin
    Memo1.Lines.Add(CkZip__lastErrorText(zip));
    Exit;
  end;

// ------------------------------------------------------------
// Iterate through all ZIP entries.
// 
// GetNext updates the same ZipEntry object so that it
// represents the next entry in the ZIP archive.
// 
while (success = True) do
  begin

    if (CkZipEntry_getIsDirectory(entry) = True) then
      begin

        Memo1.Lines.Add('[Directory] ' + CkZipEntry__fileName(entry));

      end
    else
      begin

        Memo1.Lines.Add('[File] ' + CkZipEntry__fileName(entry));
      end;

    // Advance to the next entry.
    success := CkZipEntry_GetNext(entry);
  end;

CkZip_CloseZip(zip);

Memo1.Lines.Add('Done.');

CkZip_Dispose(zip);
CkZipEntry_Dispose(entry);

end;