Dart Requires Chilkat v11.0.0+

Find a ZIP Entry by EntryID Using EntryById

See more Zip Examples

This example demonstrates how to use the EntryById method to retrieve a ZIP entry using its unique EntryID.

Each ZipEntry object has an EntryID property that uniquely identifies the entry within the currently open ZIP object.

This is useful when:

• An application stores EntryID values for later use
• ZIP entries need to be retrieved without searching by filename
• Multiple entries may have similar names or paths

The example:

• Opens a ZIP archive
• Retrieves an entry using EntryAt
• Saves the entry's EntryID
• Uses EntryById to retrieve the same entry later

Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // Open an existing ZIP archive.
  final zip = CkZip();

  try {
    zip.openZip('example.zip');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Retrieve the first entry in the ZIP archive.
  final entry = CkZipEntry();

  try {
    zip.entryAt(0, entry);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print('Original entry:');
  print('  FileName: ${entry.fileName}');
  print('  EntryID: ${entry.entryID}');
  print('');

  // Save the EntryID for later use.
  final entryId = entry.entryID;

  // Create another ZipEntry object.
  final entry2 = CkZipEntry();

  // Retrieve the same entry using EntryById.
  try {
    zip.entryById(entryId, entry2);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print('Entry retrieved by EntryID:');
  print('  FileName: ${entry2.fileName}');
  print('  EntryID: ${entry2.entryID}');
  print('');

  // The filenames and EntryID values should match.
  zip.closeZip();

  print('Done.');
}