Delphi DLL

Find ZIP Entries Matching a Wildcard Pattern Using EntryMatching

See more Zip Examples

This example demonstrates how to use the EntryMatching method to find ZIP entries whose stored paths match a wildcard pattern.

The wildcard character * matches zero or more characters. The comparison is performed against the full stored path within the ZIP archive.

This method is useful for:

• Finding files having a particular extension
• Locating files within specific subdirectories
• Searching ZIP archives without manually iterating through every entry

Suppose the ZIP archive contains:

docs/
docs/readme.txt
docs/manual.pdf
images/logo.png
images/banner.jpg
data/config/settings.json

Notice that the ZIP archive contains an explicit directory entry named docs/. ZIP archives may optionally contain separate directory entries in addition to file entries.

When searching with the pattern docs/*, the first matching entry could therefore be the directory entry docs/ rather than a file contained within that directory.

The example searches for:

• The first .png file
• The first entry beneath the docs directory
• The first JSON file anywhere within the ZIP archive

Delphi 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;

success := False;

// Open an existing ZIP archive.
zip := CkZip_Create();

success := CkZip_OpenZip(zip,'example.zip');
if (success = False) then
  begin
    Memo1.Lines.Add(CkZip__lastErrorText(zip));
    Exit;
  end;

entry := CkZipEntry_Create();

// ------------------------------------------------------------
// Find the first .png file in the ZIP archive.

success := CkZip_EntryMatching(zip,'*.png',entry);

if (success = True) then
  begin
    Memo1.Lines.Add('Found PNG file:');
    Memo1.Lines.Add('  ' + CkZipEntry__fileName(entry));
    Memo1.Lines.Add('');
  end;

// ------------------------------------------------------------
// Find the first entry beneath the docs directory.
// 
// Note: ZIP archives may optionally contain explicit directory
// entries such as "docs/" in addition to file entries.
// Therefore, the first matching entry could be the directory
// itself rather than a file contained within the directory.

success := CkZip_EntryMatching(zip,'docs/*',entry);

if (success = True) then
  begin
    Memo1.Lines.Add('First matching docs entry:');
    Memo1.Lines.Add('  ' + CkZipEntry__fileName(entry));
    Memo1.Lines.Add('  IsDirectory = ' + IntToStr(Ord(CkZipEntry_getIsDirectory(entry))));
    Memo1.Lines.Add('');
  end;

// ------------------------------------------------------------
// Find the first JSON file anywhere in the ZIP archive.

success := CkZip_EntryMatching(zip,'*.json',entry);

if (success = True) then
  begin
    Memo1.Lines.Add('Found JSON file:');
    Memo1.Lines.Add('  ' + CkZipEntry__fileName(entry));
    Memo1.Lines.Add('');
  end;

// ------------------------------------------------------------
// The matching is performed against the full stored ZIP path.
// For example:
// 
//     docs/readme.txt
//     images/logo.png
//     data/config/settings.json
// 
// The wildcard '*' matches zero or more characters.

CkZip_CloseZip(zip);

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

CkZip_Dispose(zip);
CkZipEntry_Dispose(entry);

end;